https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231143
Bug ID: 231143
Summary: Ipfw fwd with route(8) RTF_BLACKHOLE and fast
forwarding on FreeBSD 11
Product: Base System
Version: 11.2-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: misc
Assignee: b...@freebsd.org
Reporter: run0...@gmail.com
A situation has arisen in which ipfw fwd stops working when
RTF_BLACKHOLE or RTF_REJECT, ROUTE (8), is enabled on
Freebsd 11 release.
FreeBSD 11.2-RELEASE-p1
route add default 127.0.0.1 -blackhole –iface
ipfw show
00100 30 4056 fwd 10.0.0.5 ip from table(1) to not 10.0.0.0/8 in via em0
The packet counter changes, but forwarding does not work.
On FreeBSD 10 everything works fine.
I suppose this is due to changes to forwarding -> fast forwarding by
default in FreeBSD 11 and man ROUTE (8), “BUGS - unless IP fast forwarding is
enabled, in which case the meaning of the flag will always be honored.”
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