Re: ip_always_defrag setting for hosts (not routers)

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On Fri, Aug 11, 2000 at 09:40:31AM -0700, James Griffiths wrote:
> 
> Hello All,
> 
> The info in Documentation/proc.txt for the
> ip_always_defrag sysctl variable states that : 
> 
> "never ever say Y here for a normal router or host."
> 
> For a router, the possibility of not all fragments 
> being routed through the same router(s) is a clear
> reason for this statement. However, why is this option
> 
> ruled out for a host which is a simple endpoint for 
> IP-traffic ?

It is a slight bit more inefficient in 2.2 and 2.4, but you
would probably not be even able to benchmark the difference.
In future kernels always enabling ip_always_defrag may break
local optimizations.

> 
> My interest is mainly because enabling the option 
> would simplify the IPCHAINS rules required to 
> provide packet filtering of selected services on
> a web server host.

For a web server it really doesn't matter, because it 
normally never processes ip fragments. The main fragment
user is NFS. 


-Andi
 
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