Andrea Campi wrote: [ ... ]
The way I'm addressing this is to have autoipd use SIOCAIFADDR and manage exactly one address in the 169.254/16 block. This means you will ALWAYS have an IP address in that range; if you also run dhclient, you might have an additional IP and a default route.
Thoughts?
See http://files.zeroconf.org/draft-ietf-zeroconf-ipv4-linklocal.txt:
1.9. When to configure an IPv4 Link-Local address
Having addresses of multiple different scopes assigned to an interface, with no adequate way to determine in what circumstances each address should be used, leads to complexity for applications and confusion for users. A host with an address on a link can communicate with all other devices on that link, whether those devices use Link- Local addresses, or routable addresses. For these reasons, a host SHOULD NOT have both an operable routable address and an IPv4 Link-Local address configured on the same interface.
...but there is more there to read. It's fine to let an interface have a 169.254/16 IP and a "real" IP (assigned by DHCP, the user, etc) for a little while during transitions, but not forever.
-- -Chuck
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