On Mar 13, 2013, at 1:52 PM, Schrodinger <schrodin...@konundrum.org> wrote:
> On 2013/03/13 12:27, Mark Martinec wrote: > > Hi Mark, > >> On Wednesday March 13 2013 10:17:27 Schrodinger wrote: >>> ifconfig_re0_ipv6="inet6 2001:41D0:2:E7c4::1 prefixlen 64" >>> [...] >>> Voodoo, indeed... I'm sure there's a /48 used somewhere but to be more >>> specific, or rather obvious, my default gateway resides at the boundary >>> of a /56 - 2001:41D0:2:E700::/56 >> >> Having multiple IPv6 subnets on the same wire is asking for trouble. >> > > This isn't my network so I don't have any input into the matter. This > is the OVH configuration for their dedicated servers, at least in my > product range. > >> For example, I believe an ICMP redirect still (in 9.1) does not create >> a temporary route: >> http://www.freebsd.org/cgi/query-pr.cgi?pr=152791 >> which beat us hard time (random unreachability between hosts), >> having to rearrange that legacy segment which happened to have >> two subnets on the same wire. >> >> The static routes destinations must be directly reachable (on-link). >> > > Does adding the interface route not put the default gateway on-link > though ? > >> Either use a single /56 for the whole LAN, adjusting the prefix >> length on each interface, or provide a router within each subnet. >> > > If I am to change my prefix length to /56 this means that anyone else in > that /56 who is configured with a prefix length of 64 will be routing to > me and I will be swicthing to them.... This could cause problems. I fail to see how they would be routing to you and you would be switching to them. OVH allocates a /64 per customer. To avoid having to setup 1 gateway per customer, they set up a single one within a /56 , allowing for 256 /64s This mimics the situation where your host gives you a /32 ipv4 withing a /24 network and uses a single gateway, again for 250ish customers. Whenever an IPv6 packet arrives on OVH's router for your /64, it is routed to your server. I don't see how this qualifies as "another customer routing to you" ? _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
