The 60 octets are the contents of the packet. You look through the packet
using the different standards for packets. Things like RFC 1700 are useful
for this.
> [0000]: 09 00 07 FF FF FF 00 05 02 08 09 4E 00 24 AA AA
> [0010]: 03 00 00 00 80 F3 00 01 80 9B 06 04 00 01 00 05
> [0020]: 02 08 09 4E 00 FF 00 8A 00 00 00 00 00 00 00 FF
> [0030]: 00 17 00 00 00 00 00 00 00 00 00 00
For instance, this packet uses an IEEE 802.3 header.
09 00 07 FF FF FF - dst addr - AppleTalk broadcast address
00 05 02 08 09 4E - src addr - 000502 - Apple Computer vendor code
00 24 - length
AA - dsap
AA - ssap
03 - cntl
00 00 00 - org
80 F3 - type AppleTalk AARP
It is an Appletalk packet. If you don't want it to bring up the link
then add a filter rule to the call filter for this connection.
Pipelines come with a number of example packet filters already configured
but not installed on any interfaces. One of these is an "AppleTalk Call"
filter. [This filter is also explained in the User's Guide]
Basically you need a Generic rule that will try to make sure the packet is
an IEEE 802.3 packet and will match the Ethernet type "80f3" field. The
following is an Ascend example.
20-403 AppleTalk Call
Generic...
Forward=No
Offset=14
Length=8
Mask=ffffff000000ffff
Value=aaaa0300000080f3
Compare=Equals
More=No
This has the disadvantage that it could [theoretically] match other packets
but has the advantage that it is a single rule. To do it "better" you would
need two rules that were chained together using the "More" parameter.
20-403 AppleTalk Call
Generic...
Forward=No
Offset=0
Length=6
Mask=ffffffffffff
Value=090007ffffff
Compare=Equals
More=Yes
20-403 AppleTalk Call
Generic...
Forward=No
Offset=20
Length=2
Mask=ffff
Value=80f3
Compare=Equals
More=No
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