[Bug 239609] Please add full set of zeroconf routes to each interface

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https://bugzilla.redhat.com/show_bug.cgi?id=239609





--- Comment #7 from Lennart Poettering <lpoetter at redhat.com>  2008-09-03 19:00:47 EDT ---
(In reply to comment #4)
> Linux is fine with multiple routes to the same network. The route that was
> created last wins. Of course, that means you cannot reach any link-local hosts
> on the network that was attached first, but I guess that is OK. 

I need to correct myself here. Linux doesn't allow multiple routes to the same
destination with the same metric.

An elegant way to work around this is by adding the ifindex to the 1000. i.e.
Something like this:

ip route add 169.254.0.0/16 dev eth0 metric $((1000 + `cat
/sys/class/net/eth0/ifindex`)) scope link

The second route (i.e. the default one) only needs to be there if we have an
IPv4ll address assigned. I can thus create it in the avahi-autoipd package, it
doesn't need to be set globally.

Thus I only ask you to replace this line in the network scripts:

 ip route replace 169.254.0.0/16 dev ${REALDEVICE}

by this one:

  ip route add 169.254.0.0/16 dev ${REALDEVICE} metric $((1000 + `cat
/sys/class/net/${REALDEVICE}/ifindex`)) scope link

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