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cisco-integrated cisco-security-agent custom networkice-blackice sygate-personal sygate-personal-pro sygate-security-agent zonelabs-integrity zonelabs-zonealarm zonelabs-zonealarmorpro zonelabs-zonealarmpro
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Firewall Cisco Integrated Client Firewall (this is a DLL that ships with the client) Cisco Security Agent Custom Firewall Network ICE BlackICE Defender Sygate Personal Firewall Sygate Personal Firewall Pro Sygate Security Agent Zone Labs Integrity Zone Labs ZoneAlarm Zone Labs ZoneAlarm or ZoneAlarm Pro Zone Labs ZoneAlarm Pro
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Table 17-1 Supported Firewalls and Their Parameters
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The intercept-dhcp command is used by Microsoft L2TP/IPSec clients and allows the appliance to intercept the DHCP requests from these clients and forward them to a DHCP server You can enable LZS software compression of tunneled data traffic with the ip-comp command You should only enable this feature for remote access groups that use dialup modems The Easy VPN remote also has to enable LZS compression before compression can be performed The ip-phone-bypass command is used when user authentication is enabled for users behind hardware remotes, like the ASA 5505 (discussed in 18) When user authentication is enabled for users behind a hardware client, each user must authenticate to use the tunnel Some devices, like IP phones, can t Configuring this command allows Cisco IP phones to be exempt from the user authentication process When this feature is enabled, the hardware client looks at the source MAC address to determine if it is a Cisco IP phone SECURITY ALERT! The problem with the IP phone bypass feature is that since the range of MAC addresses used by Cisco IP phones is well known, attackers could change their MAC address to fall in this range and bypass authentication You can enable Cisco proprietary IPSec over UDP (ipsec-udp and ipsec-udpport), a precursor to NAT-T, to allow users associated with this policy to always encap-
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sulate ESP packets in a UDP payload IPSec over UDP was the first Cisco commercially available solution to tunnel ESP traffic in UDP payloads, getting around issues with address translation and firewall devices If you enable this feature for a policy, the default UDP port number used is 10000, which you can change to a port number from 4001 to 49151, except for 4500, which is reserved for NAT-T TIP It is recommended to use NAT-T rather than IPSec over UDP since NAT-T uses a discovery process to determine if the UDP encapsulation of ESP is necessary
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The LEAP bypass feature, configured with the leap-bypass command, is used only by hardware clients implementing user authentication when wireless devices, using LEAP to pass EAP information to an AAA RADIUS server, need to pass through the hardware client Since user authentication is being performed, and LEAP must occur before this process, this command exempts LEAP devices from user authentication Actually, 8021x (which is implementing LEAP) is in the process of performing user authentication, and the EAP information needs to be forwarded across the tunnel to the AAA server So even though this command is exempting user authentication with the hardware client, it is still being done via 8021x to an AAA server The msie-proxy commands allow you to have the Windows IPSec software remote modify the proxy setting for Microsoft Internet Explorer You can autodetect a proxy, use the user s current configuration, or specify a server that should be used You can even have certain web traffic bypass the proxy
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Starting in version 7, the appliances support NAC NAC policies define criteria a user s computer must meet to connect to the network, like the user must be running a certain vendor s firewall and/or antivirus software, with a minimal version of each NAC policies are defined on an AAA server or NAC appliance With IPSec remote access, NAC is configured in a group policy with the nac command You can enable NAC for a group policy (nac enable), specify an ACL to use for NAC users (nac-default-acl), how often the user device has to be reevaluated via NAC (300 to 86,400 seconds, where 3600 is the default in the nac-reval-period command), and the status query timer (300 to 1800 seconds, where 300 is the default in the nac-sq-period command) Hardware remotes have two modes they can use to connect to an Easy VPN server: client and network extension modes (these are discussed in more depth in 18) Network extension mode (NEM) is disabled by default For hardware remotes that need to use NEM, the group policy associated with their tunnel group must have this feature enabled This is accomplished with the nem enable command By default XAUTH user passwords cannot be stored on remotes unless you allow it with a policy on the appliance This feature prevents someone from stealing or hacking into a corporate computer and then bringing up a tunnel without providing any additional authentication credentials If you want to override this behavior and allow XAUTH usernames and passwords to be stored locally on a remote, then configure the password-storage command This command is necessary for hardware clients when using default unit authentication (discussed in 18); however, I highly recommend that you not enable this feature for software remotes For hardware clients, if you enable secure unit authentication (SUA) with the secureunit-authentication command, the username s password for XAUTH is erased on the hardware client, and someone behind the hardware client must provide the XAUTH information in order to bring up the tunnel SUA is discussed in 18 For hardware remotes, you can enable user authentication, which requires each user behind the hardware remote to authenticate in order to use the tunnel This feature is enabled with the user-authentication command The default idle timeout for authenticated users is 30 minutes, but can range from 1 to 35,791,394 minutes (user-authenticationidle-timeout) User authentication is discussed in more depth in 18 By default, perfect forward secrecy (PFS), which performs DH again during Phase 2, is not used by Easy VPN remotes You can allow its use by configuring the pfs command The advantages and disadvantages of PFS were discussed in 16 When the data connection lifetime expires (the ESP connections), rekeying occurs by default, but not re-authentication of the remote You can force re-authentication with the re-xauth command Split tunneling defines what traffic from the user must go across the tunnel and what traffic can leave the client in clear text Split tunneling policies are defined with the splittunnel-policy command The default split-tunneling policy is tunnelall, which means that, with the exception of DHCP and ARP packets, all traffic from the remote must go across the tunnel You can exclude networks from being tunneled (excludespecified parameter) or include networks that should only be tunneled (tunnelspecified parameter) When overriding the default split tunneling policy, you must use the split-tunnel-networklist command to specify what destination networks are (tunnelspecified) or are not
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