How to prevent a router from sending out ICMP messages

Answered Question
Dec 22nd, 2012

Hi guys,

Just wondering if I can somehow to stop my router to send out ICMP "administratively prohibited unreachable" message when icmp packet are being blocked by ACL.

Don't want my router to waste it's CPU resources.

Thanks a lot.

Gleb.

I have this problem too.
0 votes
Correct Answer by rajs2 about 2 years 2 months ago

Hi

It is similar to packets getting process switched.

It can lead to high CPU if you receive lot of such packets which requires to send "icmp unreachables"

Thanks

Raju

Correct Answer by rajs2 about 2 years 2 months ago

Hi

configure " no ip unreachables" on the interfaces. This will disable sending icmp unreachable messages

Thanks

Raju

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Correct Answer
rajs2 Sat, 12/22/2012 - 07:21

Hi

configure " no ip unreachables" on the interfaces. This will disable sending icmp unreachable messages

Thanks

Raju

jimmysands73_2 Sat, 12/22/2012 - 09:27

Just curious....how processor intensive is this to send a simple "administratively prohibited unreachable" message?

Correct Answer
rajs2 Sat, 12/22/2012 - 18:01

Hi

It is similar to packets getting process switched.

It can lead to high CPU if you receive lot of such packets which requires to send "icmp unreachables"

Thanks

Raju

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Posted December 22, 2012 at 6:40 AM
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