kern/71474: route lookup does not skip interfaces marked down

[Ruslan Ermilov]

The following reply was made to PR kern/71474; it has been noted by GNATS.

From: Ruslan Ermilov <ru at FreeBSD.org>
To: Thomas Quinot <thomas at cuivre.fr.eu.org>
Cc: bug-followup at FreeBSD.org
Subject: Re: kern/71474: route lookup does not skip interfaces marked down
Date: Wed, 8 Sep 2004 09:24:51 +0300

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 On Tue, Sep 07, 2004 at 08:44:24PM +0200, Thomas Quinot wrote:
 >=20
 > This issue can be demonstrated using gif interfaces:
 >=20
 > # ifconfig gif0 create
 > # ifconfig gif0 192.168.0.254 192.168.0.1
 > # ifconfig gif0 down
 > # ifconfig gif1 create
 > # ifconfig gif1 192.168.0.253 192.168.0.1
 >=20
 > Note at this point that 192.168.0.1 is reachable through interface
 > gif1.
 >=20
 > # route add 192.168.1.0 192.168.0.1
 > # netstat -rn | grep 192.168
 > 192.168.0.1        192.168.0.253      UH          1        0   gif1
 > 192.168.1          192.168.0.1        UGS         0        0   gif0
 >=20
 > Note then that, even though 192.168.0.1 is marked as reachable through
 > gif1, for the purpose of routing to 192.168.1.0 the selected interface
 > is gif0 (which is down).
 >=20
 > Fix not determined yet. This problem can be worked around by
 > changing the addresses on the down interface so it won't clash
 > with those of the up one:
 >=20
 > # ifconfig gif0 192.168.99.1 192.168.99.2
 > # ifconfig gif0 down
 > # route delete 192.168.1.0 192.168.0.1
 > # route add 192.168.1.0 192.168.0.1
 > # netstat -rn | grep 192.168
 > 192.168.0.1        192.168.0.253      UH          1        0   gif1
 > 192.168.1          192.168.0.1        UGS         0        0   gif1
 >=20
 Just tell it the interface you really want:
 
 route add -net 192.168.1 -iface gif1
 
 
 Cheers,
 --=20
 Ruslan Ermilov
 ru at FreeBSD.org
 FreeBSD committer
 
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