[nsp] AS5300 loosing memory

jlewis at lewis.org jlewis at lewis.org
Fri Aug 22 20:26:22 EDT 2003

On Fri, 22 Aug 2003, Jason Houx wrote:

> Well its either break path MTU or reboot and kick ppl off-line while the
> unit reloads - personally i would rather put AS5350's and AS5400s in the
> mix because those have been just fine.  These AS5248's are getting their
> memory fragged by all the scanning from just hosts inside of our network.  
> If you have a suggestion I would love to hear it.  route-map match length
> 92 92 is supported on these at least not with the IOS we have.  We tried
> running just filtering the nasty M$ crap and still had to reload the
> units.  Blocking ICMP has stopped these units from needing reloaded.  AND

You don't have to block all icmp (breaking PMTUD)...just echo and 

int e0
 no ip unreach
no access-list 199
access-list 199 permit tcp any any established
access-list 199 deny   icmp any any echo
access-list 199 deny   icmp any any echo-reply
access-list 199 permit ip any any
interface Group-Async1
 no ip unreach
 ip access-group 199 in
interface Virtual-Template1
 ip access-group 199 in
 no ip unreach

Our 5200's with this seem to be holding out.  The 5396's and 53192's
running 12.1 and 12.2 can do the more elegant route-map/policy routing
trick that only blocks 92 octet echo/echo-reply.  The infection is so bad, 
show access-l 199 on some 5200's shows more blocked echo than passed 

 Jon Lewis *jlewis at lewis.org*|  I route
 System Administrator        |  therefore you are
 Atlantic Net                |  
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