ipfw -- why need to let icmp out that I already let in?

Ivan Voras ivoras at freebsd.org
Tue Oct 30 16:11:39 PDT 2007

freebsd at dreamchaser.org wrote:

> add 10510 allow icmp from any to any out via oif() keep-state

I don't think ICMP is stateful :)

You need both in and out rules for ICMP because the logical responses to
packets can't be reliably connected into a single communication.

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