cbac-question-ios-12.3

Hello,

I am learning cbac, and have set up a mini lab (laptop/router etc), I have setup cbac and it does work in that it lets return traffic come back to my laptop, e.g. when I telnet/ssh to a host from my laptop behind the router to a host external to the router.

However, in the cisco ios book, it says that when you do sh access-lists, you see the temporary opening cbac creates when its used, when I telneted and ssh'd to an external box, I did this but it does not show the temporary opneings it should for access-list 151. In 12.3 is it different behaviour?

config is(running on 1841)

Current configuration : 2825 bytes ! version 12.3 no service pad service tcp-keepalives-in service tcp-keepalives-out service timestamps debug datetime msec localtime show-timezone service timestamps log datetime msec localtime show-timezone service password-encryption service sequence-numbers ! hostname iss-web-router ! boot-start-marker boot-end-marker ! security authentication failure rate 10 log security passwords min-length 6 no logging buffered logging console informational enable secret 5 $1$ZljO$a.H7zbOdpLvVDYJgwu6Mv0 enable password 7 011B570A0B1F035C ! aaa new-model ! ! aaa authentication login local_auth local ! aaa session-id common ! resource policy ! mmi polling-interval 60 no mmi auto-configure no mmi pvc mmi snmp-timeout 180 ip subnet-zero no ip source-route no ip gratuitous-arps ip cef ! ! ip inspect name iss-web-router ftp ip inspect name iss-web-router h323 ip inspect name iss-web-router http ip inspect name iss-web-router tcp alert on router-traffic ip inspect name iss-web-router udp ip inspect name iss-web-router icmp no ip dhcp use vrf connected ! ! no ip ips deny-action ips-interface no ip bootp server no ip domain lookup login block-for 10 attempts 3 within 5 ! no ftp-server write-enable ! ! ! username cisco privilege 15 secret 5 $1$.Ry8$8ml8czOZdwsvRok7kCA700 ! ! ! ! ! interface FastEthernet0/0 description $ETH-LAN$$ETH-SW-LAUNCH$$INTF-INFO-FE 0$ ip address 192.168.8.1 255.255.255.0 ip access-group 150 in no ip redirects no ip unreachables no ip proxy-arp ip inspect iss-web-router in speed auto full-duplex no mop enabled ! interface FastEthernet0/1 ip address 192.168.52.239 255.255.255.0 ip access-group 151 in ip verify unicast source reachable-via rx allow-default 100 no ip redirects no ip unreachables no ip proxy-arp speed auto full-duplex no mop enabled ! ip default-gateway 192.168.52.1 ip classless ip route 0.0.0.0 0.0.0.0 192.168.52.1 ! no ip http server ip http authentication local no ip http secure-server ip http timeout-policy idle 600 life 86400 requests 10000 ! ! no logging trap access-list 150 permit ip 192.168.8.0 0.0.0.255 any access-list 150 deny ip any any access-list 151 permit tcp any any eq telnet access-list 151 permit tcp any any eq domain access-list 151 deny ip any any log dialer-list 1 protocol ip permit no cdp run ! ! control-plane ! banner login ^CISS Webhosting Router^C banner motd ^Cuthorized ^C ! line con 0 exec-timeout 5 0 timeout login response 300 login authentication local_auth transport output telnet line aux 0 exec-timeout 15 0 login authentication local_auth transport output telnet line vty 0 4 privilege level 15 password 7 000C4208544F0E55 login authentication local_auth transport input telnet line vty 5 15 privilege level 15 password 7 141F43055C102F78 login authentication local_auth transport input telnet ! end

Reply to
cconnell_1
Loading thread data ...

Yes. Somewhere in 12.3 they changed it so rather than adding lines to ACLs the information about the traffic to allow is kept somewhere else. "show ip inspect session" might reveal something, or search CCO for "CBAC ACL bypass" perhaps.

Rgds, Martin

Reply to
Martin Gallagher

There were major changes to the CBAC implementation from 123-8.T (I believe).

The "ip audit" command was replaced by the "ip ips" command.

formatting link
IOS Firewall Feature Set Frequently Asked Questions

formatting link
to apply to the old cbac only.

Mr CISCO - PLEASE FIX ABOVE.

I have spent about 15 mins looking but cannot find the proper description of the changes.

Reply to
anybody43

Cabling-Design.com Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.