[lwip-devel] [bug #35927] missing refragmentaion in ip_forward

[Ivan Delamer]

Follow-up Comment #2, bug #35927 (project lwip):

Just a note that, according to RFC, an IPv4 router has the option to either
fragment the packet to fit the outgoing netif's MTU, or sending back an ICMP
"Packet too big" message.

So if IP_FRAG is not defined, we should still check packet size vs netif MTU
and send back a ICMP PTB if necessary.

(In IPv6 you always send a ICMPv6 PTB back, as part of path MTU discovery.)

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