Re: IP defrag (was RE: ipchains blocking port 65535)

[Tony Gale <gale@syntax.dera.gov.uk>]

On 17-Jan-2001 Andi Kleen wrote:
> 
> Connection tracking always defrags as needed.
> masquerading/NAT/iptables 
> with connection tracking uses that.
> 
> This means that if any of these are enabled and your machine acts
> as a 
> router lots of CPU could get burned in defragmentation, and packets
> will not forwarded until all fragments arrived.

Hmm... ok, what if I'm on a single nic system using ipchains on the
input and want to always defrag before they hit the ipchains
filter, what settings would I need? No masq., no NAT. (bearing in
mind that ipchains differentiates between SYN+frag and noSYN+frag.

> 
> All very nasty, but unfortunately there is no alternative.
> 

Nasty but necessary. Such is life.

-tony


---
E-Mail: Tony Gale <gale@syntax.dera.gov.uk>
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