On Wed, Sep 13, 2017 at 06:56:51AM -0700, Andy Ruhl wrote: > On Tue, Sep 12, 2017 at 10:37 AM, Roy Bixler <rcbix...@nyx.net> wrote: > > I'm pretty sure that our network does not use Cisco as the router. I > > think that the admin. uses some kind of a Linux distribution which he > > then sets up with an OSPF daemon and so forth. > > I'll say it another way: Once you put an IPv6 address onto some > devices, Cisco in particular, they "just decide" to become a router > and do router advertisements. This is probably the case on your > network.
I don't know of any Linux distribution that would try to "just decide" to "become a router". Perhaps there's some niche distribution which claims to "make routing easy", but I doubt that's the case here. The network admin. dislikes appliances and prefers Gentoo which, if anything, is very much a DIY distro. > So really, you have 2 issues here: > > 1. Who is sending out router advertisements? You can probably find > that out easily enough since the MAC is embedded in these link local > addresses. Might want to find out if those machines should be doing > that. Probably not. I don't know the answer, because I haven't set up this network. > 2. How does a machine properly handle this situation? Linux seems to > just put in equal cost routes for all of them, so either they are load > balancing or they have some other selection criteria. Based on the > behavior of machines doing router advertisements, I would hope that > reachability is being done somehow, but maybe this is wishful > thinking. (Again, unresearched.) A bit more research shows that this is a Linux-specific feature. There is a suite called "iproute2" which does this. You can find more information here: https://wiki.linuxfoundation.org/networking/iproute2 -- Roy Bixler <rcbix...@nyx.net> "The fundamental principle of science, the definition almost, is this: the sole test of the validity of any idea is experiment." -- Richard P. Feynman
