I am running CBAC on a 1811 running IOS 15.1 and can't figure out how to configure it so that I can preform TFTP upgrades with CBAC enabled. It appears that CBAC doesn't catch self-generated traffic and put in a reverse rule in the ACL. I am trying to upgrade the image on this router using a public-addressed TFTP server on the F0 interface. If I drop the ACL the traffic will work, so why isn't CBAC cacthing the TFTP outbound? Here is my config:
ip inspect name trust icmp
ip inspect name trust udp
ip inspect name trust tcp
ip address x.y.z.1 (public)
ip access-group 100 in
no ip unreachables
no ip proxy-arp
ip inspect trust in
no ip route-cache
access-list 100 permit tcp any any eq 22
access-list 100 permit udp any any eq tftp
The tftp rule above is for TFTP upgrades on other equipment, using a server behind this router. I tried defining an outbound ACL as well on F0 to get the traffic be "caught" by CBAC but that didn't work. I also tried adding "ip inspect name trust tftp" but that didn't help.
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