From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Thu Nov 29 2001 - 00:38:57 GMT-3
We usually see SNA filtered with 0x0000 0x0D0D but...
Based upon all of the examples I've seen on CCO, as shown below, we only
need to worry about the response for the SSAP (mask 0x0001)
access-list 202 permit 0x0404 0x0001 ! Permits SNA frames (command or
response)
access-list 202 permit 0x0004 0x0001 ! Permits SNA Explorers with NULL DSAP
So, given that, isn't 0x0000 0x0C0D technically more correct than 0x0000
0x0D0D since we only worry about the response for the SSAP?
Also, if for SNA we only change the SSAP for the response (0x0404
0x0001), why do examples for Netbios and IPX use a mask of 0x0101 (as
in 0xF0F0 0x0101 and 0xE0E0 0x0101)? Every doc I've seen on CCO is
consistent with regards to difference between SNA and netbios / ipx, any
idea why the difference in the mask?
Brian
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