03-25-2008 08:59 AM - edited 03-05-2019 09:57 PM
Hi,
I am having high CPU utilization (sometimes 90% or more) on a 1841 router. Checking with "show processes cpu" I found out that about 2% is caused by processes and all the rest is because of interrupts. So I checked NAT translations and there are a lot of them so I think maybe that is the problem. My internal LAN is /24 and all traffic is NATed with overload to one public IP address.
A lot of the translations seem to be from one different port on every IP address to different destinations from each IP address, for example:
udp x.x.x.x:60630 x.x.x.250:60630 x.x.x.x:x x.x.x.x:x
Also about an hour ago I cleared ip nat translations and statistics, and "show ip nat statistics" gives me the following:
Total active translations: 1834 (0 static, 1834 dynamic; 1834 extended)
Outside interfaces:
FastEthernet0/0
Inside interfaces:
FastEthernet0/1
Hits: 312162 Misses: 11021
CEF Translated packets: 315723, CEF Punted packets: 14884
Expired translations: 13256
Dynamic mappings:
-- Inside Source
[Id: 2] access-list xx interface FastEthernet0/0 refcount 1834
[Id: 1] route-map XXX interface FastEthernet0/0 refcount 0
Queued Packets: 0
Do any has had any problem like this or can give me any advice on what to look for?
Thanks a lot,
Fabián
03-25-2008 10:09 AM
I am having the exact issue you described.
My setup is exactly as yours. I am running
this on a Cisco 2621 64MRAM/16MFlash.
As soon as I configure one of my boxes for
Emule, my connection goes out of control and
the router just freezes. It will pass traffics and I can NOT even console into the
device. The only way to fix this is to
physically OFF/ON the router. When this
happened, the router is contanstly at 99%
CPU utilization. By the way, I am running
IOS 12.3(24) with firewall and IDS feature
set.
Welcome to the misery.
CCIE Security
03-25-2008 11:01 AM
Thanks. So do you think high CPU utilization and NATing is a problem of any P2P software running? We checked PCs and it seemed no software like that was running.
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