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Document the fact that blackhole routes normally need to be bound

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to lo(4) interfaces to have an effect, and that this is not needed
when using IP fast forwarding.

Sponsored by:	eXtensible Open Router Project <URL:http://www.xorp.org/>
MFC after:	3 weeks
This commit is contained in:
Bruce M Simpson 2004-11-04 02:15:03 +00:00
parent 38f061057b
commit 2c9743caad
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=137180
1 changed files with 10 additions and 0 deletions
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10
sbin/route/route.8
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@ -412,3 +412,13 @@ utility appeared in
The first paragraph may have slightly exaggerated
.Xr routed 8 Ns 's
abilities.
.Pp
Currently, routes with the
.Dv RTF_BLACKHOLE
flag set need to have the gateway set to an instance of the
.Xr lo 4
driver, using the
.Fl iface
option, for the flag to have any effect; unless IP fast forwarding
is enabled, in which case the meaning of the flag will always
be honored.