[nsp] High CPU on 2600

Voll, Scott Scott.Voll at wesd.org
Thu Oct 23 10:50:45 EDT 2003

Have you looked at how much ICMP traffic your getting on the box?  We
had routers dieing with all the ICMP traffic the viruses were putting

On the Sh Proccess CPU see what your  IP Input looks like.  If it seems
really high block ICMP and log it and see if that's your problem.


-----Original Message-----
From: Joel Perez [mailto:jperez at numind.net] 
Sent: Thursday, October 23, 2003 7:20 AM
To: cisco-nsp at puck.nether.net
Subject: [nsp] High CPU on 2600

Hey guys,
I have a small problem. I have a 2600 in a remote office doing NAT'ing
serving about 20-25 people. Everything works fine except that the cpu on
the 2600 is thru the roof.
They aren't generating much traffic, probably about 1.5 megs. The 2600
is only using the FastEth for the internal and external interaces. Can
the NAT'ing be making my CPU that high?
Here is the config I have now:
ip subnet-zero
ip cef
interface FastEthernet0/0
 description ---------------"Gateway to Internet"---------------
 ip address
 ip nat outside
 duplex auto
 speed auto
interface Serial0/0
 no ip address
 no fair-queue
interface FastEthernet0/1
 description ---------------"Gateway To Etrade"---------------
 ip address
 ip nat inside
 duplex auto
 speed auto
ip nat pool Traders prefix-length 24
ip nat inside source list 1 pool Traders overload
no ip http server
ip classless
ip route
access-list 1 permit
Joel Perez <jperez at ntera.net>  | IP Engineer
http://www.ntera.net/                 | Ntera
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