[Bug 212170] ipfw fwd does not works if defaultgateway is not assigned

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212170

--- Comment #3 from doorsfan <yura_doorsfan at mail.ru> ---
Thank You for answer!
netstat -sp ip | grep discard
is incremeting while pinging without default gateway.

I opened thread https://forums.freebsd.org/threads/57456/

I understood that router must try to router packet through the any interface
(even with status "no carrier" like in experiment was described in forum) and
only in such case ipfw fwd external_ip begins to work.
"The reason it probably works with a "fake" gateway is because it's sending a
bunch of ICMP redirects, directing it to the proper gateway."

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