Every IPv6 interface is going to get a Link-Local address so that a device can at least communicate on the local link, and, as a built-in feature, many things, e.g. routing protocols, use it for communications on the local link.

> That said, the link-local addresses are *NOT* the issue here, and having > them will not cause said problems, the problem here is the user has 4 > real world IPv6 addresses configured by a router on his network + user > configuration (the 6to4 address). Well, the user does not have them now anymore and Mozilla uses the link-local. IPv6 Temporary Address - Enable or Disable - Windows 7 Sep 07, 2013 networking - How to dynamically enable and disable ipv6 on

Remove IPv6 Addresses From an Interface - Sun Ethernet

> a link-local IPv6 address just by bringing the interface up -- and I > don't want one. > > Google has found me the anser for Debian, but for Gentoo all it found > was somebody else asking the qeustion (with no answers). I didn't try it myself, but what about sysctl? net.ipv6.conf.eth0.disable_ipv6=1 or something like that @hadrich said in How-to disable ipv6 dns server from dhcp (v4) server: I don't use Ipv6 and the dns address was fe80::7e35:xxxx:xxxx:151a. That's a link local address and if you don't have IPv6 it won't be used for much. You can ignore it. Every IPv6 capable device will have one of those.

All networks that have IPv6 also have an IPv6 link-local address which is ignored if any IPv4 or other IPv6 prefix is present. Should IPv6 be disabled for Failover Clustering? The recommendation for Failover Clustering and Windows in general, starting in 2008 RTM, is to not disable IPv6 for your Failover Clusters.

I'm looking to prevent the IPv6 link local address from being randomly assigned. I'm not looking to disable v6 but rather statically assign my own link local. I've done ifconfig vboxnet0 inet6 add fe80::/126 and it works and I can do ping6 -I vboxnet0 fe80::1 and successfully ping my VM but then eventually I end up with 2 link local addresses All networks that have IPv6 also have an IPv6 link-local address which is ignored if any IPv4 or other IPv6 prefix is present. Should IPv6 be disabled for Failover Clustering? The recommendation for Failover Clustering and Windows in general, starting in 2008 RTM, is to not disable IPv6 for your Failover Clusters.