Date: Wed, 30 Aug 2000 08:10:04 -0700 (PDT) From: Ruslan Ermilov <ru@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/20785: changing interface IP in same subnet doesn't propagate properly Message-ID: <200008301510.IAA85174@freefall.freebsd.org>
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The following reply was made to PR kern/20785; it has been noted by GNATS.
From: Ruslan Ermilov <ru@FreeBSD.org>
To: Robert Watson <rwatson@FreeBSD.org>
Cc: bug-followup@FreeBSD.org
Subject: Re: kern/20785: changing interface IP in same subnet doesn't propagate properly
Date: Wed, 30 Aug 2000 18:00:07 +0300
On Tue, Aug 22, 2000 at 02:06:06PM -0400, rwatson@FreeBSD.org wrote:
>
> Changing the IP address of an interface may not necessarily cause new
> sockets to make use of the new IP address, if the address is in the same
> subnet as the previous address under IPv4. This only seems to affect
> outgoing packets to non-local addresses; the correct IP is used for outgoing
> local packets on the subnet.
>
I recently experienced this bug (with exact the same workaround) when I was
playing with my libalias(3) ICMP fixes. Yesterday, when I was playing with
my kernel ICMP error generation fixes, I noticed that a similar bug happens
with `-reject' static routes and thought that this might be related to this
bug.
1. Add the `-reject' route on your gateway machine:
# route add -host 1.2.3.4 -iface lo0 -reject
2. From another box ping this host:
$ ping -c1 1.2.3.4
You will not see the ICMP unreachable message.
3. On the router box, re-add the default route:
# route delete default
# route add default $foo
4. From another box try to ping this host again:
$ ping -c1 1.2.3.4
Now you will see the ICMP unreachable message.
--
Ruslan Ermilov Oracle Developer/DBA,
ru@sunbay.com Sunbay Software AG,
ru@FreeBSD.org FreeBSD committer,
+380.652.512.251 Simferopol, Ukraine
http://www.FreeBSD.org The Power To Serve
http://www.oracle.com Enabling The Information Age
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