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650-472 S802dot1X - Introduction to 802.1X(R) Operations for Cisco Security Professionals

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650-472 exam Dumps Source : S802dot1X - Introduction to 802.1X(R) Operations for Cisco Security Professionals

Test Code : 650-472
Test title : S802dot1X - Introduction to 802.1X(R) Operations for Cisco Security Professionals
Vendor title : Cisco
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S802dot1X - Introduction to 802.1X(R) Operations for Cisco Security Professionals

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Aruba Networks' CEO Hosts 2012 Analyst Day (Transcript) | killexams.com true questions and Pass4sure dumps

No result found, try recent keyword!The explosion of mobile devices to this -- initially by the introduction of their top platforms [indiscernible ... really the basis for my wired side configuration. If I wanted to 802.1x, if I want to d...

Carrier Ethernet: sizable picture issues for carrier deployment | killexams.com true questions and Pass4sure dumps

Years ago, incumbent service providers offered virtual circuits on top of Frame Relay, ISDN or ATM networks, and enterprises used Ethernet to provide LAN connectivity within their private networks. The two worlds never mixed and usually interacted through routers providing layer-3 switching services.

The ubiquity and widespread popularity of Ethernet resulted in many-sided low-cost solutions. Ethernet chipsets are manufactured in huge quantities, and the relatively simple technology allows for cost-effective implementation. So service providers trying to proffer lower-cost high-speed services started to supersede the traditional technologies (from DSL access to the SONET core) with Ethernet, which can provide speeds up to 10Gbps.

Ethernet enters service provider networks

Ethernet technology is totality over the location now, particularly in three major areas in modern service provider networks:

  • Access Networks: Low-cost concentration of high-speed access links usually implemented as fiber-to-the-building (FTTB) or fiber-to-the-home (FTTH).
  • Core Networks: Long-range Ethernet (Ethernet on single-mode fibers) is used as the high-speed point-to-point technology replacing SONET/SDH.
  • Transport: Site-to-site transparent Ethernet services are offered as a replacement for DWDM services or as a low-maintenance solution for service providers that Have not yet mastered VPN services.
  • Service provider network Ethernet limitations

    In totality cases, the early Ethernet adopters in service provider networks Have faced significant problems. Why? Because Ethernet technology and the cost-effective products offered by networking vendors addressed the needs of private enterprise-wide deployment, not large-scale public network deployment. Some of the basic limitations of using Ethernet in a service provider network include:

  • Ethernet doesn't provide virtual circuits, but a shared bridged domain where every participant can communicate with and influence any other participant.
  • Ethernet doesn't provide end-to-end signaling similar to Frame Relay Local Management Interface (LMI). In general, it's impossible to betoken to a customer end-point that the other End of the link is no longer available.
  • Ethernet expects network-wide uniqueness of physical (MAC) addresses, which cannot live enforced when a service provider offers transparent Ethernet services to numerous customers.
  • The Ethernet virtual LAN (VLAN) technologies execute not scale. For example, the 802.1Q standard has a network-wide limitation of 4,096 VLANs.
  • Ethernet has no inherent security architecture. Even the authentication services provided by 802.1x address the needs of authenticating a user connected to a shared virtual LAN infrastructure.
  • On top of the technology issues, service providers were faced with paraphernalia limitations. The traditional routers or layer-3 switches coupled with large-scale, high-speed layer-2 aggregation were simply not capable of offering the required per-user services. For example, the high-performance per-user services in a Cisco 7600 router were made possible only after the introduction of ES20 and ES40 line cards.

    Standards address Carrier Ethernet fixes

    The industry was quick to address the shortcomings of the Ethernet technology. recent standards in the IEEE's 802.1 Working Group address specific service provider needs:

  • 802.1ad (Q-in-Q) defines two-level VLAN encapsulation, which the service providers can use to transport customer VLANs across service provider backbones.
  • 802.1ah defines truly scalable VLAN-in-VLAN solution (where the all customer Ethernet frames are encapsulated in a VLAN envelope).
  • ITU recommendation Y.1730 defines Ethernet OAM requirements.802.1ag defines the Connectivity fault Management and associated MIB.
  • Vendor carrier-grade platforms

    >

    Major networking vendors Have implemented these standards, giving service providers a many-sided technology deployed on carrier-grade platforms. You Have to live heedful when buying the equipment, however, because the carrier-grade additions to Ethernet are posing an additional tribulation on Ethernet switches, resulting in more expensive boxes.

    For this reason, most vendors proffer two groups of Ethernet equipment. The lower-cost paraphernalia implements the traditional enterprise-focused Ethernet functionality, while the higher-cost paraphernalia provides carrier-grade services (for example, Cisco calls the carrier-focused devices Metro Ethernet Access switches). If your acquisition process focuses solely on the paraphernalia cost without specifying the minimum required functionality, you might elope into unpleasant surprises when trying to deploy Ethernet-based service.

    Carrier Ethernet's other issues

    Remember that the Carrier Ethernet standards address solely the shortcomings of the Ethernet technology. You'll necessity to address numerous other issues you necessity to address in a large-scale Ethernet deployment, including:

  • User identification. Your physical infrastructure might extend to end-points that are not currently using your services. For example, if you're rolling out FTTH infrastructure, you'll try to attain every home in the neighborhood while laying the fiber, not just those that chance to live your customers. It is vital to Have a mechanism to authenticate and empower your customers. Some incumbent service providers Have opted to deploy PPPoE over high-speed Ethernet infrastructure, transforming the recent fiber-based infrastructure into yet-another dialup solution (and incurred huge overhead because they needed powerful access devices to back high-speed PPPoE sessions). It's course more cost-effective to deploy aggregation switches that back DHCP option 82 to identify the customer port.
  • End-user protection. Consumer-focused Carrier Ethernet is usually deployed as a big ratiocinative LAN (single IP subnet) to connect individual users. By default, Ethernet switches allow these users to communicate directly without the overhead of going through the central aggregation router. While this approach definitely reduces the load of the aggregation router in environments with a big percentage of peer-to-peer traffic, it moreover exposes totality end-users to direct layer-2 attacks (including ARP spoofing) from other end-users connected to the identical LAN segment. The layer-2 attacks Have to live stopped at the network ingress point; the first aggregation switch has to back ARP inspection.
  • Denial-of-service protection. IP uses additional protocols (ARP and DHCP) on Ethernet to allocate IP addresses to clients and establish mappings between MAC and IP addresses. While it's always been possible to repercussion a router's operation with a flood of ARP packets (and use mechanisms like Control Plane Policing to protect the router), the aggregation scale deployed in modern carrier networks (thousands of customers aggregated onto a 10GigE port on a router) makes the task significantly harder. A single dissatisfied customer can create a denial-of-service assail that can influence thousands of other customers, unless the assail is stopped at the point where it's still manageable: on the first aggregation switch, which has to back DHCP snooping and DHCP/ARP rate limiting.

    The bottom line on Carrier Ethernet

    With the additional functionality provided by recent 802.1 standards and implemented by major networking vendors, Carrier Ethernet became ready for production-grade deployment in service provider networks and you should seriously regard its use in your network infrastructure if you haven't deployed it yet.

    The migration from traditional technologies (SONET in the core and DSL in the access) to Carrier Ethernet should live well-designed, planned and tested, as Ethernet does not provide a cheaper one-to-one replacement for current technologies.

    When replacing core SONET links with Carrier Ethernet, live sensible that you'll lose the fleet link loss detection and rerouting inherent in SONET. These functions Have to live migrated to layer-3 devices (for example, using the fleet Reroute functionality of MPLS traffic engineering). Likewise, it's not efficient to deploy Carrier Ethernet over FTTx fiber links and emulate DSL circuits by running PPPoE over the recent high-speed infrastructure. To benefit from Carrier Ethernet deployment, you should implement a provisioning and accounting solution that supports DHCP, VLANs and Netflow-based accounting (or its equivalent).

    About the author: Ivan Pepelnjak, CCIE No. 1354, is a 25-year veteran of the networking industry. He has more than 10 years of sustain in designing, installing, troubleshooting and operating big service provider and enterprise WAN and LAN networks and is currently chief technology advisor at NIL Data Communications, focusing on advanced IP-based networks and Web technologies. His books embrace MPLS and VPN Architectures and EIGRP Network Design. Check out his blog for more on networking.


    Building Secure Wireless Networks | killexams.com true questions and Pass4sure dumps

    While many paranoid system administrators and users still regard any WLAN to live a gaping hole, these networks can live successfully secured against snooping and unauthorized access with a exiguous thought and effort. Fortunately for us, Linux provides some flexibility when it comes to choosing a wireless safeguard. While it's the ultimate wireless attacker's platform, it's moreover the optimal system to reliance on when deploying a hardened WLAN. This is not surprising if you regard that network assail and defense are two sides of the identical coin.

    This article describes the security issues facing the modern 802.11 networks and the solutions available to mitigate these problems using the Linux platform.

    Main Security Problems The number one wireless security problem in the true world is the ignorance of the users and system administrators. They Have wardriven for several years in different parts of the world collecting statistics about totality discovered WLANs. Unfortunately, the percent of completely open WLANs (roughly 70% of totality establish networks) still remains the same. It doesn't matter how capable the industry-provided safeguards are; they're entirely useless if not turned on and properly configured, and that's what they notice on every corner of every street they pass by. Some of the open access points they saw were clearly Linux HostAP-based, so Linux users are not spared and can live just as security-ignorant as well. In fact, several types of ignorance originate WLANs an effortless prey for attackers on the streets or obnoxious neighbors:
  • Complete lack of information of Layer 1/radio frequency operation. Not knowing how far the signal can spread from the intended coverage zone and how far away a prepared attacker can pick it up and ill-treat it is probably the main reason for leaving totality these completely unprotected WLANs around.
  • The lack of understanding about Layer 2 wireless security - there are still people who believe that WEP, closed ESSIDs, and even MAC address filtering are sufficient to desist the attackers chilly (no, this is not a joke).
  • System administrators who are clueless about so-called "rogue" wireless devices being installed on their (not obviously wireless) networks by unruly users or even staid crackers using such appliances for out-of-bound backdoor access.
  • While everything mentioned above is related to the low even of user education and network mismanagement, there are unfortunately a few purely technical problems related to 802.11 security. First of all, 802.11 management frames are still not authenticated. The 802.11 "I" task group, assigned with improving wireless security, tried to implement inescapable 802.11 frames authentication but did not succeed. Thus, any 802.11 WLAN can live easily DoS'ed by flooding it with spoofed deauthentication or deassociation frames. Such floods are more than a mere nuisance since they can live used as an integral fraction of the man-in-the-middle and even companionable engineering attacks. The only thing you can execute is install wireless IDS that will detect the flood, spot the attacker physically, and scare them away.

    Second, the paraphernalia supporting the recently adopted 802.11i wireless security standard practically implemented by the Wireless Protected Access (WPA) Industry Certification still suffers from vendor interoperability problems, despite WPA version 1 being a fraction of the Wi-Fi Certification now. This presents a staid challenge for multivendor wireless networks, such as public warm spots relying on users bringing their own cards. Finally, the 802.11i wireless security standard is actually more like a set of standards, and some of these standards Have well-known weaknesses, e.g., lack of mutual authentication in EAP-MD5. Besides, even when the standard design is solid, there are always contemptible implementations that nullify the advantages it presents.

    Why and How Crackers Exploit WLANs Knowing your enemy is an absolute requirement of proper network protection, and penetration testing should always live your first line of defense. It's highly suggested that as a system administrator or wireless community guru you expend some time trying to exploit your own WLAN. If you are an IT security professional, it's always capable to participate in ethical wardriving to notice what's really happening on the "wireless front lines" despite many "armchair expert" opinions. This is why they wrote Wi-Foo: The Secrets of Wireless Hacking. Since the final manuscript was submitted, nothing has changed when it comes to wireless attacker motivation and type. People still assail WLANs seeking fully anonymous access (no ISP logs) to screen their tracks, looking for backdoor out-of-bound access to corporate networks (no egress filtering would abet and IDS sensors can live circumvented), and free bandwidth. However, a variety of recent public domain assail tools Have appeared, notably Hotspotter, aircrack, and wep_lab. These and many other tools can live establish at their site (www.wi-foo.com), which probably has the largest categorized collection of wireless security-related open source tools and is updated on a regular basis.

    Hotspotter allows successful man-in-the-middle attacks against unpatched Windows boxes, exploiting a flaw in Windows Profiles. Even the WPA-protected networks are vulnerable.

    Aircrack optimizes cracking WEP, achieving a much higher efficiency than AirSnort, used casually for this task, and implements WEP'ed packets reinjection to accelerate WEP cracking in a course that's similar to OpenBSD Wnet's reinj tool. WEPPlus, a proprietary Proxim's solution to the FMS assail against WEP now replaced by TKIP in WPA-certified Proxim/Orinoco products, is moreover vulnerable to aircrack's novel statistical attack. Wep_labs is another optimized WEP cracking instrument and its latest version, posted to Packetstorm two days before this article was written, has been successfully ported to MS Windows. This puts the final nail into the coffin of WEP. Those still relying on it as the main WLAN defense measure should immediately switch to TKIP or higher-layer defenses. WEP cracking is now as effortless as it gets, and even a Netstumbler kiddie with XP Home Edition has a reasonable chance of getting your key.

    However, WPA version 1 is moreover not without security problems. They Have mentioned the lack of mutual authentication with EAP-MD5, the first EAP character to live employed by 802.1x that is still widely in use, since any 802.1x implementation would most likely back it. Setting up HostAP plus accepting any authentication credentials on a Linux host and forcing the clients to associate with such a rogue AP is lifeless easy. Cisco EAP-LEAP is moreover flawed or, better to say, the MS-CHAP it uses is. The assail against EAP-LEAP (implemented by Asleap-imp) was first unleashed by Joshua Wright at Defcon 11. Since then more tools that use it, such as THC-Leapcrack, were released. TKIP is vulnerable to offline dictionary attacks, at least in the SOHO preshared key (PSK) mode. A research paper describing these attacks in detail is available at http://wifinetnews.com/archives/002452.html. There is moreover a lot of hype regarding the use of the WPA version 1 hash message authentication code (HMAC) implementation as a vector for DoS attacks. However, launching such attacks in practical terms has been far from effortless and they Have never encountered them in the true world. delight refer to Table 1 for a comparison of various wireless encryption schemes.

    Secure Wireless Networks Design and Deployment Using Linux Despite everything said above, WPAv1 (TKIP+802.1x+MIC hash or TKIP+PSK+MIC hash for SOHO mode) is far more secure than WEP, and WPAv2 (CCMP+802.1x+AES-based hash) is conjectural to live even harder to crack than WPAv1. Here we'll recount how to implement these countermeasures to build a secure Linux wireless network that includes both Linux client hosts and Linux-based, custom-built access points. Many commercial access points, for example, those produced by Belkin and Netgear, are built on Linux anyway. They will extensively use HostAP, open source software that can live downloaded from http://hostap.epitest.fi, for running and securing Linux clients and access points. Another common instrument related to securing wireless networks is Xsupplicant (www.open1x.org), which provides Linux client-side back for the 802.1x port-based authentication standard. motif 1 shows the 802.1x authentication mechanism. HostAP Jouni Malinen's HostAP is split into four parts: hostap-driver, hostapd, hostap-utils, and wpa-supplicant. The driver fraction is amenable for providing a supple interface to the hardware and firmware functions of your wireless card. HostAP has initially been developed to back Intersil Prism chipset cards, but has now been extended to back other wireless chipsets such as Orinoco (alas, not in an Access Point mode). The hostapd daemon enables us to use a Prism chipset wireless card in Access Point mode (Master mode) with back for IEEE 802.1x and dynamic WEP rekeying, RADIUS Accounting, RADIUS-based ACLs for IEEE 802.11 authentication, minimal IAPP (IEEE 802.11f), WPAv1, and IEEE 802.11i/RSN/WPAv2. HostAP utilities provide extended capabilities to your wireless interface and embrace diagnostic and debugging utilities, firmware update tools, and various wireless scripting interfaces. The wpa-supplicant allows clients to utilize WLANs that back WPA-PSK (SOHO) and WPA Enterprise authentication methods. hostapd Many people wish to use their Prism2 cards as a functional and secure access point. This task is very effortless to accomplish with hostapd. Download and compile the latest version of hostapd and copy hostapd.conf and hostapd binary to your preferred location. Now you necessity to edit the hostapd.conf configuration file to specify the exact functionality of your Linux-based AP. The hostapd is very supple and extensive; it allows you to control every aspect and security office of the AP. On multiple occasions we've establish HostAP-based access points to live more stable and controllable than the industry-standard expensive APs. We'll briefly contour how to configure hostapd to back 802.1x, WPA-PSK, and WPA Enterprise even user/device authentication, and rekeying schemes. hostapd and 802.1x Authentication If your paraphernalia is outdated or an implementation of WPA is not feasible for your organization for some bizarre reason, frequent 802.1x-based WEP key rotation is one of the few choices left to secure your WLAN. To back dynamic WEP rekeying using hostapd, you should Have the following configuration options enabled in hostapd.conf:

    ssid=Arhont-xmacaddr_acl=1accept_mac_file=/etc/hostapd.acceptdeny_mac_file=/etc/hostapd.denyieee8021x=1wep_key_len_broadcast=13wep_key_len_unicast=13wep_rekey_period=900own_ip_addr=192.168.111.22nas_identifier=hostap.arhont.comauth_server_addr=192.168.111.101auth_server_port=1812auth_server_shared_secret=Very-Secret_KEYacct_server_addr=192.168.111.101acct_server_port=1813acct_server_shared_secret=Very-Secret_KEY

    Adjust the following settings of your specific network setup: ssid, own_ip_addr, nas_identifier, auth_server_addr, auth_server_shared_ secret, acct_server_addr, and acct_server_shared_secret. The next step is to create /etc/hostapd.accept and /etc/hostapd.deny files, which will Have a list of MAC addresses of wireless cards that are allowed to connect to your AP. Once the configuration files are ready, launch hostapd in the following manner:

    hostapd /etc/hostapd.conf

    where /etc/hostapd.conf is the location of the hostapd configuration file. Don't forget that you'll moreover necessity a working RADIUS server. The FreeRADIUS server is an excellent open source solution. You can download it from www.freeradius.org. Check out the freeradius mailing list and FAQ if you Have any difficulties with the RADIUS implementation.

    hostapd and WPA-PSK WPA-PSK is a replacement for static WEP on SOHO environment networks. To achieve WPA authentication using the Pre-Shared Key authentication, enable the following options in the hostapd.conf file:

    ssid=Arhont-Xmacaddr_acl=1accept_mac_file=/etc/hostapd.acceptdeny_mac_file=/etc/hostapd.denyauth_algs=1own_ip_addr=192.168.111.22wpa=1wpa_passphrase=secret-password-blahwpa_key_mgmt=WPA-PSKwpa_pairwise=TKIP CCMP

    As with the previous example, adjust the settings to delineate your network requirements. Unlike 802.1x and WPA Enterprise authentication means, with WPA-PSK there is no necessity to specify RADIUS server details. Once the configuration files are ready to live deployed, elope hostapd the identical course you would with the 802.1x setup.

    Congratulations, you now Have a working hostapd with WPA-PSK support. However, don't forget to select a very sturdy PSK, taking into account its vulnerability to bruteforcing.

    hostapd and WPA Enterprise To enable the enterprise grade WLAN encryption, regard using WPA-EAP authentication. The following settings in hostapd.conf are required to enable this mode:

    ssid=Arhont-xmacaddr_acl=1accept_mac_file=/etc/hostapd.acceptdeny_mac_file=/etc/hostapd.denyieee8021x=1own_ip_addr=192.168.111.22nas_identifier=hostap.arhont.comauth_server_addr=192.168.111.101auth_server_port=1812auth_server_shared_secret=Very-Secret_KEYacct_server_addr=192.168.111.101acct_server_port=1813acct_server_shared_secret=Very-Secret_KEYwpa=1wpa_key_mgmt=WPA-EAPwpa_pairwise=TKIP CCMPwpa_group_rekey=300wpa_gmk_rekey=6400

    As with dynamic WEP using 802.1x, WPA-EAP requires the use of a RADIUS server to authenticate mobile users. Once the hostapd is restarted, to purchase outcome of the modified hostapd.conf file you should Have a perfectly working Linux AP with WPA-EAP authentication means.

    wpa_supplicant We've dealt with the server side of setting up a Linux AP with various authentication schemes; now it's time to dispute a secure setup for the client side. Once the wpa-supplicant is downloaded (http://hostap.epitest.fi) and compiled (refer to the README file on how to create a .config file and compile the tool), you should edit the wpa_supplicant.conf configuration file. The default version of this file has already been provided for your convenience with a description of totality the necessary fields that you might necessity to enable in order to participate in the WPA-protected WLAN. For instance, to Have client-side back for the WLAN that authenticates its clients against the RADIUS server with EAP-TLS support, the following should live enabled: network={ ssid="Arhont-w" proto=WPA key_mgmt=WPA-EAP pairwise=CCMP TKIP group=CCMP TKIP eap=TLS identity="[email protected]" ca_cert="/etc/ssl/certs/cacert.pem" client_cert="/etc/ssl/certs/client-cert.pem" private_key="/etc/ssl/certs/client-priv.pem" private_key_passwd="client-secret-password" priority=1 }

    In case you don't necessity the WPA enterprise-level authentication and you simply want to enable the WPA-PSK support, the following setup should live reflected in the wpa_supplicant.conf file:

    network={ ssid="Arhont-w" psk="very clandestine PSK passphrase" priority=5 }

    Once the configuration file is ready, you can launch the wpa-supplicant utility to associate and authenticate to the desired wireless network. It can live done the following way:

    wpa_supplicant -i wlan0 -c/etc/wpa_supplicant.conf -D hostap -B

    This should elope wpa_supplicant in daemon mode using the hostap driver on a wlan0 interface with a configuration file located in /etc/wpa_supplicant.conf. You should derive the following output from the iwconfig and iwlist commands once authentication is successful.

    wlan0 IEEE 802.11b ESSID:"Arhont-w" Mode:Managed Frequency:2.462GHz Access Point: 00:XX:XX:XX:XX:XX Bit Rate:11Mb/s Tx-Power:50 dBm Sensitivity=0/3 Retry:off RTS thr:off Fragment thr:off Encryption key:61CC-3D80-78CF-33D4-294F-B24F-C7C6-C6B8 Security mode:restricted Power Management:off Link Quality=26/94 Signal level=-69 dBm din level=-95 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 ath0 3 key sizes : 40, 104, 128bits 4 keys available : [1]: E619-D524-557B-21A3-7B48-6E26-DB68-2272 (128 bits) [2]: 006E-D5E5-6EBC-F41B-A9EC-8906-74E6-DA7D (128 bits) [3]: off [4]: off Current Transmit Key: [1] Security mode:restricted Xsupplicant In a course the configuration of xsupplicant is quite similar to wpa-supplicant. To originate the setup work, you'll necessity an AP with 802.1x support, a RADIUS server, and a set of certificates. The clients should download and compile the xsupplicant instrument and edit the xsupplicant.conf file that has various configuration options to live implemented by xsupplicant. Unfortunately, the scope of this article doesn't allow us to evaporate into the details of configuring and debugging 802.1x authentication schematics. More information on this topic can live easily Googled. If you prefer a hard copy of systematic reading material, their engage Wi-Foo: The Secrets of Wireless Hacking is a hands-on lead to wireless security and hacking.

    Once the configuration of xsupplicant is ready and configured for your WLAN, issue the following command to authenticate and derive the per-session-based dynamic WEP key.

    xsupplicant -i ath0 -c /etc/xsupplicant.conf

    If totality goes well, you should Have a similar output to iwconfig command:

    ath0 IEEE 802.11g ESSID:"Arhont-x" Mode:Managed Frequency:2.462GHz Access Point: 00:XX:XX:XX:XX:XX Bit Rate:36Mb/s Tx-Power:50 dBm Sensitivity=0/3 Retry:off RTS thr:off Fragment thr:off Encryption key:A3D0-FF7F-AD85-E6AB-1808-38A8-90 Security mode:restricted Power Management:off Link Quality=28/94 Signal level=-67 dBm din level=-95 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0

    As you can see, the xsupplicant successfully authenticated to AP with 802.1x back and received a pair of keys that is used to encrypt the unicast and broadcast traffic. By issuing the iwlist wlan0 key command you can derive the list of keys that has been assigned to you by the AP.

    ath0 3 key sizes : 40, 104, 128bits 4 keys available : [1]: A3D0-FF7F-AD85-E6AB-1808-38A8-90 (104 bits) [2]: CCD1-7D97-A2D3-9B4A-CAA1-DE7E-A6 (104 bits) [3]: off [4]: off Current Transmit Key: [1] Security mode:restricted

    You can control reauthentication and rekeying time intervals from an access point side. If WEP and not TKIP or CCMP is used, they imply rotating the key every five minutes.

    Wireless Intrusion Detection (wIDS), Higher Layer Defenses, and Secure Wireless Gateways Apart from implementing 802.11i-based countermeasures, there are more things you can execute to secure your Linux-based wireless network. One is detecting attacks against your WLAN. This can live done by adding another wireless PCMCIA or PCI card to your Linux-based access point or pile a specialized wIDS box, perhaps using a Soekris board (www.soekris.com) or a Linux PDA. This card will Have to tarry in the RFMON mode with a selected wIDS instrument (or set of tools) running to resolve the traffic it picks. The defense fraction at www.wi-foo.com lists the currently available open source wIDS tools. Most of them are signature-based and effortless and straightforward to configure. However, probably the best option for implementing now is to use Kismet to monitor your WLAN. Kismet detects an extensive list of suspicious wireless events, including Netstumbler kids and floods with various 802.11 management frames. It will moreover exhibit you rogue access points and other WLANs in the area, as well as inescapable types of non-802.11 traffic using the identical frequency purview with Wi-Fi LANs.

    When a suspicious event is detected, a siren sounds and information about the event flashes at the bottom of the screen. To notice the info about recent suspicious events on your WLAN in a sunder ncurses panel, press "w". If you're deploying a big WLAN, you can gain a imposing odds from Kismet's client/server structure, with multiple clients installed along the network reporting the events to a centralized server.

    On the server side, you can easily integrate Kismet with Snort, providing intrusion detection on totality network layers. Open kismet.conf file, scroll toward the #fifo=/tmp/kismet_dump, uncomment this line, redeem the configuration file, and start kismet_server. Once started, Kismet will lock the /tmp/kismet_dump file until it's picked up by Snort. Now, let's start Snort. Configure it to your liking, but add an additional -r /tmp/kismet_dump switch when you elope it, so it will read data from the FIFO feed of Kismet. You can further install and elope ACID for pleasant and colorful IDS log viewing.

    Another thing to regard is deploying higher-layer defenses instead of or with 802.11i (if the security requirements of the network are tall or you're truly paranoid). Imagine a long-range point-to-point wireless link. Using IPSec as implemented by Linux OpenSwan or KAME suites to secure such a link provides more flexibility than using WPA, since you Have a imposing option of (symmetric, assymmetric, and hash) ciphers and IPSec modes. You won't necessity the RADIUS server for the link a la WPA Enterprise and will achieve a higher even of security than provided by WPA SOHO.

    Make confident that the IPSec key distribution over such a link is mutually authenticated (Diffie-Hellman) to avoid crackerjack-style wireless man-in-the-middle attacks. If you regard IPSec too difficult to use or unnecessary, modern Linux PPTP with MPPE implementations are reasonably secure. Of course, in such cases you are limited to 128-bit RC4 and static PSK to encrypt wireless data.

    If you want to connect a limited resources device such as a Linux PDA or mobile phone without 802.11i/WPA support, SSH port forwarding can live an preempt and effortless option that is highly interoperable and does not set a big tribulation on the available device resources. originate confident that SSHv2 is running and there are no vulnerabilities in the sshd daemons used, since anyone can try to launch an assail against your link and daemons. There are many extensive sources that recount the practical use of IPSec, PPTP, and other VPN protocols such as cIPE and SSH port forwarding on Linux so we're not going to compete with them here.

    Finally, it makes sense to sunder your wireless and wired networks with a secure gateway. 802.11 Security by Bruce Potter and Bob Fleck (O'Reilly) goes to imposing lengths explaining how to build such gateways using stateful filtering and port/protocol forwarding with Linux Netfilter. The gateway must live as hardened as it can get: they strongly imply using security-oriented distros such as Astaro or Immunix and implementing kernel-level security (OpenWall, Grsecurity, St Jude, etc.) alongside the standard Linux-hardening practices. Due to the flexibility of the OS, such a gateway can moreover serve as an 802.11i-secured access point, wireless traffic load-balancer, wIDS/IDS sensor, VPN concentrator, and RADIUS server. Combine totality these properties in a commercial, proprietary, closed-source solution and you'll derive a $100,000 product. With Linux, the opportunities are there and are only limited by your imagination, desire, and time.



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