Re: [lwip-devel] [lwip-commits] lwip/src/core/ipv6 ip6.c

[address@hidden]

Ivan Delamer wrote:
> > I think this is a problem for IPv4, too. Shouldn't we call ip(6)_frag()
> > if the mtu is exceeded?
> It's a bit different in IPv6, routers are not allowed to fragment packets.
> The specified behavior is called "Path MTU", if a router can't forward a
> packet it must return an ICMPv6 message and the source must fragment (or
> discard).
>
> It's OK to call ip_frag in IPv4 as AKAIK.
That's what I think from reading about it, too. However, ip_frag() is 
currently not called from ip_forward(), and the MTU is not checked in 
that function either.

Simon