in.c autoadding prefix route

Vladimir Grebenschikov vova at
Sun Jul 3 00:09:48 GMT 2005

В чт, 11/11/2004 в 21:24 +0100, Max Laier пишет: 
> All,
> I know I have sent this a couple of times before, but never got anywhere. This 
> time I am set to commit!
> The attached patch ( derived from 
> WIDE via OpenBSD in.c, rev 1.21 improves the handling of automatic prefix 
> routes.
> Right now you can't have two legs into the same network. If you want to, you 
> must give on of the interfaces a host address only (netmask /32). This way it 
> is not possible to hand over the route if one of the interfaces is 
> "removed" (however this is done in the special case).
> The patch allows to add more than on IPv4 address with the same prefix. In the 
> case that there is a route already, we leave it alone and add the new address 
> without the IFA_ROUTE flag. When we remove an address later on, that has a 
> route associated, we try to find an alternative address to use for the route 
> and hand it over.
> This is required for CARP, but should be helpful for other situations as well.
> Any objections?

This change actually broke one simple thing:

# ifconfig lo0 alias
# ping
PING ( 56 data bytes
ping: sendto: No route to host

You should (anyway should) add routing of interface address itself to
loop-back interface, like it usually done in all other cases.

Please fix.

Vladimir B. Grebenchikov
vova at
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