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ipfw: make it possible to specify MTU for "unreach needfrag" action
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Authored by glebius on Aug 11 2022, 2:29 PM.
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pauamma added a subscriber: pauamma.

Manual page change LGTM. Can't say beyond that.

sbin/ipfw/ipfw.8
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This revision is now accepted and ready to land.Aug 12 2022, 7:19 PM

Do you plan add similar support for IPv6? There is ICMP6_PACKET_TOO_BIG with the same meaning. But actually it is not unreach message, thus I'm not sure we should do it.

In D36140#821882, @ae wrote:

Do you plan add similar support for IPv6? There is ICMP6_PACKET_TOO_BIG with the same meaning. But actually it is not unreach message, thus I'm not sure we should do it.

No, I don't plan. Indeed it requires some rethinking of unreach6 action, so that it is able to send not only ICMP6_DST_UNREACH, but other ICMP messages. So for IPv6 the change is possible, but more complicated. I'd better leave it for somebody else :)