Brocade Communications Systems Mobility 7131 Series Service Manual download pdf (Page 16)

4 Brocade Mobility 7131 Access Point Product Reference Guide

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The WWAN card is detected automatically when inserted into the Mobility 7131N Access Point

express card slot. The card is detected as a USB/Serial device once its modules are loaded. If the

card is inserted before or during module installation, the user has to wait until all the modules are

loaded before the card is operational. These modules are loaded when the Mobility 7131N Access

Point boots up (at runtime). Activate and configure the WWAN card from the access point’s applet

and CLI.

NOTE

The WAN failover feature is only supported on Mobility 7131N Access Point model access points, as

theMobility 7131 model access point does not support the required PCI express card slot.

For more information on configuring a Mobility 7131N Access Point model access point for WAN

failover support, see Configuring WAN Settings on page 5-127.

Proxy ARP Support

With this most recent release of the access point firmware, the access point can respond to ARP

requests on behalf of an associated MU and protect the MU’s network credentials from being

broadcasted on a publicly accessible network.

When Proxy ARP is enabled on the access point (it’s enabled by default), the access point can

make an MU physically located on one network appear part of a different network connected to the

same access point. Proxy AP allows the access point to “hide” an MU’s IP address behind the

access point’s firewall, while still having the MU appear to be on the public network. Proxy ARP

supports both strict and dynamic modes on the access point.

For example, when Proxy ARP is enabled on the access point (it’s disabled by default) and the

access point receives an ARP request (either a wired or wireless request) for the IP address of an

associated MU, the access point responds directly to the request (on behalf of the MU) instead of

broadcasting the ARP request over the publicly accessible wireless network.

When enabled, any system on the wireless network that ARPs for the IP address of an associated

MU will receive an ARP reply from the access point stating the requesting system should be

sending packets destined for the MU to access point instead. In turn, the access point forwards the

requesting packets to the target MU. Through this process, the access point can pass ARP requests

in both directions, making an MU appear to be connected to a public network even though it’s on a

private network hidden behind the access point.

For detailed information on configuring Proxy AP support of the access point, see Enabling Wireless

LANs (WLANs) on page 5-137.

Multi Cipher Support

Beginning with this release, professional installers have the option of deploying both new and

legacy MUs within the same WLAN. Multi cipher support extends the access point’s existing WLAN

security options by allowing dynamic WEP and 802.11i configurations to co-exist, and allowing

multiple security policies to be associated with the same ESSID on different WLANs. Within such an

environment, legacy MUs are capable of WEP, while new MUs are capable of WPA/2-TKIP and

WPA2-CCMP encryption. This particular form of multi cipher (security) support helps maintain the

co-existence of dynamic WEP and 802.11i based environments.

For information on configuring Multi Cipher support, see Configuring Multi Cipher Support on page

6-208.

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