
AppleTalk Overview
117366-A Rev. A 1-17
Figure 1-11. Partially Connected Tunnel
Tickle Request and Tickle Acknowledgment packets maintain the connection
between two exterior routers. When an exterior router receives an AppleTalk data
packet destined for an end system located across the IP internet, the router
encapsulates the packet with the following headers before forwarding the packet
onto the IP internet:
• Data Link Header, which specifies the data link frame information
• IP Header, which specifies the source and destination IP address
• UDP Header, which specifies the destination User Datagram Protocol (UDP)
port
• Domain Header, which specifies the source and destination AppleTalk
domain identifiers (DIs); for AURP tunneling, DIs are derived from IP
addresses
AppleTalk
internet
AppleTalk
internet
AppleTalk
internet
A
B
C
A sees B, not C
B sees A and C
C sees B, not A
APT0011A
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