Does netfilter fragments packect exceeding MTU

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Hi
	i'm trying to find out what i've said on topic. I've taken a look at this 
mail:
http://lists.netfilter.org/pipermail/netfilter/2000-August/004878.html
So i think that if you pass a packet to POSTROUTING taht exceeds MTU, 
netfilter will try to send it anyway right? Because you have to fragment 
before, 'cos netfilter doesn't expect a packet exceeding MTU right?
But that fragmentation how could be done? I've seen in the above mail some 
C-code building a fragmentation module for doing this, but it's not included 
in the official kernel tree?

Another question: in this mail i've not understood if fragmentation is done by 
such module or by a /proc entry; the mail it's quite old, so what's the 
situation actually?

thanks for any RTFM or help :)

Regards
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