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Cisco IOS firewall won't allow h323 connections

Posted on 2007-04-02
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Last Modified: 2013-11-16
I've got a Cisco 2851 router that acting as a firewall. It's running IOS 12.4 and I'm using the IOS firewall in it. My problem is I can't get h323 (specifically for polycom video conferencing) to work properly while passing throught he device. All other traffic in either direction works as advertised. I've disabled the ACLs and the inspect statments, and the problem stays. Any thoughts?
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Question by:HSBSupport
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by:Sorenson
ID: 18857223
In your inspect statments were you inspecting h323?  Can you post a sanatized config that you were trying?  If you are doing PAT, it will not work without the inspects.
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by:HSBSupport
ID: 18858222
Below is the inspect section of the config, and the setup of the interface. The access-list has the correct ports open to the VC units, and each video conference units has a static public IP that is NATed. To add to this, I've setup a test router with a PC on either side running VC software. The router is exactly the same as the the one we're having issues with, right down to using the same configuration. Just after the router boots, I can creata a connection between te two PCs using the software, after the router runs for about 10 - 15 minutes, I can no longer create the same connection.

Insepct statments (I know the sessions are set really high. Just haven't cut them back yet)
ip inspect max-incomplete high 10000
ip inspect max-incomplete low 9000
ip inspect one-minute high 6000
ip inspect one-minute low 5000
ip inspect tcp max-incomplete host 250 block-time 0
ip inspect name Inspect-g1 cuseeme
ip inspect name Inspect-g1 dns
ip inspect name Inspect-g1 ftp
ip inspect name Inspect-g1 https
ip inspect name Inspect-g1 icmp
ip inspect name Inspect-g1 imap
ip inspect name Inspect-g1 pop3
ip inspect name Inspect-g1 netshow
ip inspect name Inspect-g1 rcmd
ip inspect name Inspect-g1 realaudio
ip inspect name Inspect-g1 esmtp
ip inspect name Inspect-g1 sqlnet
ip inspect name Inspect-g1 streamworks
ip inspect name Inspect-g1 tftp
ip inspect name Inspect-g1 vdolive
ip inspect name Inspect-g1 rtsp
ip inspect name Inspect-g1 tcp
ip inspect name Inspect-g1 udp
ip inspect name Inspect-g1 h323
ip inspect name Inspect-g1 h323callsigalt
ip inspect name Inspect-g1 h323gatestat


Interface config (we're using a 4 port module inorder to gain more ports for all the connections we needed)
interface Vlan19
 description InternetLink
 bandwidth 9216
 ip address 165.166.5.130 255.255.255.128
 ip access-group ACL_OUT2 in
 ip verify unicast reverse-path
 no ip unreachables
 ip nbar protocol-discovery
 ip nat outside
 ip inspect Inspect-g1 out
 ip virtual-reassembly
 no ip route-cache cef
 service-policy output COL_OUT-MPLS
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HSBSupport earned 0 total points
ID: 19768698
After a few days and long hours with TAC....

The fix was reverse route maps and ACLs to keep the h323 traffic out of NAT.
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