Should I block packet at Edge Router or Firewall? (Pre-filter?)
I'm filtering traffic on my edge router to relieve the load on my PIX. Should I bother? I started filtering out traffic to port 137-139 and to 445, since then people have complained of slower access to the internet.
My Edge Router is:
CPU utilization for five seconds: 20%/20%; one minute: 23%; five minutes: 29%
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.1(2)T, RELEASE SOFTWARE (fc1)
Re: Should I block packet at Edge Router or Firewall? (Pre-filte
Your inbound filter on the router, forces, the router to use process switching for all packets inbound on that interface. This increases the load on the router. Your pix utilisation is normal, so you might want to shift the filtering to the pix, rather than on the router. PIX is a hardware based filtering system, so it would perform the filtering, much faster than the router can do, and also relieve the load on the router. This might help.
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