[c-nsp] CBAC and assymetricity

Joe Maimon jmaimon at ttec.com
Wed Feb 8 23:32:58 EST 2006

Cust CPE---Link A--<-- ISP A R1----Colo
       |                      |
       |                      ^
       |                      |
       +----Link B---> ISP A R2

(moz users may want to ctrl-u for the diagram)

Packet from cpe comes into ISP A r2 on Link B destined for colo

Colo packet goes to ISP A R1 to CPE link A

Colo sees initial packets from Cust CPE, but TCP connections do not proceed.

They work fine if ISP A R2 removes

"ip inspect rulebase-name in"

from the Link B

I read that CBAC "doesnt support assymetry"

Does this mean that this is doomed?

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