NAT and SIP

Unanswered Question
Sep 10th, 2009

Hello,

I have router 2801 with IOS 12.4(3i). Configuration on router is dynamic NAT (PAT) for internet access and static NAT for SIP server. Every few minutes CPU goes to 100%, and the process responsable for that is IP INPUT (it uses 70% of CPU in show proc cpu).

When there is not SIP traffic CPU is fine but when SIP starts CPU usage is 100%. Ofcourse CEF is enabled.

Does Cisco router forward SIP traffic (in combination with NAT) using process switching or I'm experiencing IOS bug?

Router configuration is in attachment.

Thanks in advance,

A.

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Overall Rating: 5 (2 ratings)
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Antonio_1_2 Thu, 09/10/2009 - 08:01

Hi Edison,

Ofcourse I forgot to say that throughput on both interfaces is around 3Mbps

download and 1Mbps upload at all time. Also when CPU is hitting 100%

Regards,

A.

Antonio_1_2 Thu, 09/10/2009 - 23:10

Hi,

This is normal behavior? Cause I can't find this in documentation.

Thanks,

A.

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