Steve is right. Setting up a default route on a link-local interface is
inherently flawed.

The default route is the the "gateway of last resort", i.e., the router
address used when no other known route exists for a given IP packet's
destination address. However, the basic architectural assumption of
link-local networks is that no routable address is configured. Thus, by
definition, no routers or dhcp servers are available to the interface.
Consequently, it makes no sense for avahi-autoipd to assign a default
route.

Worse, when the host has multiple interfaces, avahi interferes with
standards-compliant network connections to the internet. (For example,
the host has both a wired NIC connected to routeable network and a
wireless card either not connected or connected only to a local
printer.) Avahi-autoipd's assignment of a default route will result in
multiple default routes (one from it and one from the actual router),
causing connectivity to the internet to break. See, e.g.,
http://ubuntuforums.org/showthread.php?p=4501456 (noting that the best
solution is to purge avahi and its cousins).

Happy Trails,

Loye Young
Isaac & Young Computer Company
Laredo, Texas
http://www.iycc.net

-- 
avahi-autoipd gives me an useless default route
https://bugs.launchpad.net/bugs/99489
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