[c-nsp] Cisco 867 SIP & NAT

[Andrew Yager]

Hi,

We have a client using a Cisco 867 with SIP based VoIP phones behind it (not CCM).

Each time the phones perform a new SIP request a new entry is created in the NAT table on a different port, which very quickly floods the NAT table and crashes the router.

We've tried with c860-universalk9-mz.150-1.M6 and c860-universalk9-mz.151-4.M5 but are seeing the same behaviour.

Client nat config is relatively standard:

ip nat inside source list 10 interface Dialer0 overload
ip nat inside source static tcp 10.1.1.100 5900 interface Dialer0 5900
ip nat inside source static tcp 10.1.1.100 1723 interface Dialer0 1723

access-list 10 permit 10.1.1.0 0.0.0.255

Has anyone seen this issue on this series of routers and/or know if it's an IOS bug? Any fixes or workarounds or working IOS versions?

Thanks,
Andrew

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Andrew Yager, Managing Director   (MACS Snr CP BCompSc MCP MCE JNCIA-Junos)
Real World Technology Solutions Pty Ltd  - IT people you can trust
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