Date: Wed, 8 Sep 2004 12:50:25 GMT From: Ruslan Ermilov <ru@freebsd.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/71474: route lookup does not skip interfaces marked down Message-ID: <200409081250.i88CoPBQ086191@freefall.freebsd.org>
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The following reply was made to PR kern/71474; it has been noted by GNATS. From: Ruslan Ermilov <ru@freebsd.org> To: Thomas Quinot <thomas@freebsd.org> Cc: bug-followup@freebsd.org Subject: Re: kern/71474: route lookup does not skip interfaces marked down Date: Wed, 8 Sep 2004 15:49:26 +0300 On Wed, Sep 08, 2004 at 02:26:29PM +0200, Thomas Quinot wrote: > * Ruslan Ermilov, 2004-09-08 : > > > But your test case only applies to P2P interfaces, when both ends > > of two P2P interfaces share the same IP address. > > No, this is not the case. Only the remote ends of the two interfaces > share the same IP address. I described that test case because using gif > interfaces makes it easier to reproduce, but I initially observed this > symptom with one bge and one Intel wireless (ndis) interface. > That's what I meant (two remote ends of both interfaces). > > I do not see how this could apply to broadcast interfaces. > > As follows. Consider a machine with two Ethernet interfaces I1 and I2. > > ifconfig I1 192.168.0.1 netmask 255.255.255.0 > ifconfig I1 down > ifconfig I2 192.168.0.2 netmask 255.255.255.0 > route add default 192.168.0.254 > > The default route will be set to 192.168.0.254 on I1, not on I2 as > expected. > It's still a misconfiguration -- if you do not bring the I1 interface down, the "interface" route for I2 will not be installed, and the ifconfig(8) command will be aborted. Anyway... I reproduced this with two ng_eiface(4) nodes. There's still a useful option in the route(8) utility -- you can supply an explicit reference to the interface, like this: : route add default 192.168.0.254 -ifp I1 This is also vaguely documented in the route(8) manpage, FWIW: : In a change or add command where the destination and gateway are not suf- : ficient to specify the route ..., the -ifp or -ifa modifiers may be used : to determine the interface or interface address. Cheers, -- Ruslan Ermilov ru@FreeBSD.org FreeBSD committer
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