APPENDIX E " OWL/IP

Frame Forwarding

MAC frames originating on the home subnet are encapsulated in the super root, forwarded through the IP network, deencapsulated in the designated bridge, and forwarded to the appropriate access point for delivery to the intended wireless station. The same process is used in reverse between the designated bridge and the super root for inbound frames. The encapsulation uses the standard IP GRE protocol.

Outbound

Data frames are forwarded outbound through an IP tunnel if:

"A wireless station is known to be attached to an access point on a particular remote subnet.

"The frame type is specified in the [TX Filter] menu.

Designated bridges are responsible for forwarding attach status for wireless stations to the super root. The super root maintains entries for these stations in its forwarding database indicating the correct subnet for outbound forwarding.

IP ARP (Address Resolution Protocol) and ICMP frames are normally forwarded outbound through all tunnels. Enabling the ARP server in the super root can reduce the number of ARPs forwarded.

Inbound

The same forwarding rules apply for frames inbound from remote subnets. Designated bridges maintain entries in their forwarding database for addresses that require routing through tunnels.

Frames destined for servers or stations on the local subnet are not forwarded through tunnels. Only frame types configured in the [TX Filter] menu are forwarded.

6710 Access Point User’s Guide E-11

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Intermec 6710 manual Frame Forwarding, Outbound, Inbound