[avahi] Link local IPV6 addresses

[Lennart Poettering]

On Sun, 04.02.07 09:41, Bill Trost (trost at cloud.rain.com) wrote:

> Interesting thought! When I first saw your email, I tried a few
> experiments manually creating a static route to a link-local address
> using a Linux version 2.6.18-3-amd64 kernel to see if I could make it
> Do The Right Thing. Creating the route itself was pretty hard; "route
> -6 fe80:..." kept giving an error like "unknown host", and adding that
> address to /etc/hosts didn't help, either.  Eventually, I was able to
> use "ip -6 route add fe80:1::205:5dff:fef9:cc86 dev wlan0" to create
> a route, at least according to "ip -6 route", but it still refused to
> automatically use the right interface, even when wlan0 only had a single
> address. I never did manage to create a route teling it to use XXX as
> the source address when sending to the fe80:: address in question.
> 
> Someone with a better touch for route commands might see if they can
> make a miracle occur -- in particular, a route that uses a particular
> address on an interface as the "gateway" might make sense, but I
> couldn't get anything to accept such a route.

It's very unlikely that anyone is able to get this to work on current
kernels.

Have a look on net/ipv6/datagram.c:133 in the kernel sources. If no
interface is specified for LINKLOCAL sockets, connect() will always
return EINVAL. There is no workaround for this behaviour without
patching the kernel.

I am wondering if the kernel guys would accept patch to modify this
behaviour to make link-local sockets more usable.

Lennart

-- 
Lennart Poettering; lennart [at] poettering [dot] net
ICQ# 11060553; GPG 0x1A015CC4; http://0pointer.net/lennart/