cvs commit: src/sys/netinet tcp_subr.c

[Andre Oppermann]

Bruce M Simpson wrote:
> 
> On Wed, May 04, 2005 at 01:48:44PM +0000, Andre Oppermann wrote:
> >   Log:
> >   If we don't get a suggested MTU during path MTU discovery
> >   look up the packet size of the packet that generated the
> >   response, step down the MTU by one step through ip_next_mtu()
> >   and try again.
> 
> Yay! Now I really need to sit down and sort out the gre(4) PMTU story.

What's the problem there?

> Of course a more generic way of doing this might be good, e.g. a generic
> PMTU callback for each protocol which needs to exchange this information
> with the IP/ICMP layer.

There is.  Look into ip_icmp.c:icmp_input().

-- 
Andre