Paul Stewart wrote: > Hi there... > > In a SP environment, what's common practice so far with subnetting? > Typically, in IPv4 today we use a /30 or /29 for point to point and each > device has a /32 loopback... > > I've been reading a lot of different opinions and everyone seems to > recommend a /64 for each link (router) or a server - why so large? I'd love > to see a layout of a few routers in a SP core network and how they've > subnetted them....;) >
I just ran into an issue in my network (testing a 3750) where an IPv6 ACL only accepts down to a /64 for matching and only EUI-64 hosts. And there's my 877W I've mentioned a few times this week that has its own exciting quirks. Other than that, I use /64 for subnets and /128 loopbacks out of a /64 reserved for loopbacks. Using /64 and /128 is almost guaranteed to be safe at this early stage; plenty of IPv6 support just isn't that mature yet. There's an RFC or something out there (too lazy to look it up) that says use /64 for subnets, so it's the magic number for a lot of IPv6 implementations. ~Seth _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
