Motorola WS5100 用户手册

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GRE tunneling allows desktop protocols to take advantage of the enhanced route selection capabilities of IP. 
With GRE Tunneling, it is possible for the two sub-networks of network 131.108.0.0 to talk to each other even 
though they are separated by another network. 

To configure GRE tunnelling on the switch:

1. Select

> 

from the main menu tree.

The GRE Tunnels screen displays with existing GRE tunnels. 

2. Refer to the top portion of the GRE Tunnels screen for the following information:  

Displays the names of each GRE tunnel defined for the switch.

Displays the IP address where packets are originated by the switch and sent out through the 
tunnel interface. This defaults to the management VLAN's IP address.

The destination IP address of the remote end of the GRE tunnel should be the default 
gateway for MUs that are associated on WLANs mapped to GRE tunnels. When the switch 
receives packets on the GRE tunnel interface, it first decapsulates the outer IP and GRE 
headers. An IP lookup is then performed on the destination IP of the inner IP packet using a 
MU table. If the lookup succeeds, the IP packet is encapsulated in an 802.11 frame (destined 
to the MU's MAC) and sent out on the WLAN port. If the lookup fails, the packet is dropped. 
Verify the gateway address has not been set to any VLAN interface used by the switch.