What type of mobility tunneling does the Wireless LAN Controller use?
A. Controller software releases 4.1 through 5.1 support both asymmetric and symmetric mobility tunneling. Controller software release 5.2.157.0 supports only symmetric mobility tunneling, which is now always enabled by default. In asymmetric tunneling, client traffic to the wired network is routed directly through the foreign controller. Asymmetric tunneling breaks when an upstream router has reverse path filtering (RPF) enabled. In this case, the client traffic is dropped at the router because the RPF check ensures that the path back to the source address matches the path from which the packet comes. When symmetric mobility tunneling is enabled, all client traffic is sent to the anchor controller and can then successfully pass the RPF check. Symmetric mobility tunneling is also useful in these situations: • If a firewall installation in the client packet path drops packets because the source IP address does not match the subnet on which the packets are received, this is useful. • If t
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