nanog mailing list archives
Re: IPv6 Addressing Help
From: Mark Smith <nanog () 85d5b20a518b8f6864949bd940457dc124746ddc nosense org>
Date: Sun, 16 Aug 2009 15:33:33 +0930
On Fri, 14 Aug 2009 12:40:34 -0400 (EDT) Jon Lewis <jlewis () lewis org> wrote:
On Fri, 14 Aug 2009, David Freedman wrote:Will keep it simple, this is what I (and I suspect many others) do /128 - Loopback (what else?) /126 - Router p2p /112 - Router LAN shared segments (p2mp)Why even go that big on LAN segments?
Why not? Do you enjoy dealing with variable length subnets (calculating start and finish addresses and subnet masks, working out if an address falls within a subnet or not, running two subnets in parallel and hair pinning traffic via a router, just to increase the number of devices etc. etc.)? There's better things we could be doing with our time, but with IPv4 we can't, because it's address space isn't big enough ... Isn't it great that we never have to worry about IPv4 style addressing issues (e.g. sizing the subnet, manually configuring the addresses, or having an "address configuration server" attached to the segment to manage addresses) when dealing with Ethernet in the last 27 years or so? Why is that, and what can we learn from that?
i.e. If you have a LAN/VLAN where you have say 20 devices (routers, switches, etc.) and know you'll never have more than say 50-100 devices, why not go as far as using a /120? ---------------------------------------------------------------------- Jon Lewis | I route Senior Network Engineer | therefore you are Atlantic Net | _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
Current thread:
- Re: IPv6 Addressing Help, (continued)
- Re: IPv6 Addressing Help Roland Dobbins (Aug 14)
- RE: IPv6 Addressing Help TJ (Aug 14)
- Re: IPv6 Addressing Help Jeroen Massar (Aug 14)
- Re: IPv6 Addressing Help David Freedman (Aug 14)
- Re: IPv6 Addressing Help Owen DeLong (Aug 14)
- Re: IPv6 Addressing Help Randy Bush (Aug 14)
- Re: IPv6 Addressing Help Larry Blunk (Aug 14)
- Re: IPv6 Addressing Help Randy Bush (Aug 14)
- Re: IPv6 Addressing Help Jon Lewis (Aug 14)
- Re: IPv6 Addressing Help David Freedman (Aug 14)
- Re: IPv6 Addressing Help Mark Smith (Aug 15)
- Re: IPv6 Addressing Help Randy Bush (Aug 15)
- Re: IPv6 Addressing Help Mark Smith (Aug 15)
- Re: IPv6 Addressing Help Jack Bates (Aug 17)
- Re: IPv6 Addressing Help Mark Andrews (Aug 14)
- RE: IPv6 Addressing Help David Freedman (Aug 14)
- Re: IPv6 Addressing Help steve ulrich (Aug 14)
- Re: IPv6 Addressing Help Jeroen Massar (Aug 14)