nanog mailing list archives
Re: ISP customer assignments
From: Nathan Ward <nanog () daork net>
Date: Wed, 14 Oct 2009 15:55:46 +1300
On 14/10/2009, at 3:49 PM, Chris Adams wrote:
Once upon a time, Nathan Ward <nanog () daork net> said:On 14/10/2009, at 2:14 PM, Chris Adams wrote:What about web-hosting type servers? Right now, I've got a group of servers in a common IPv4 subnet (maybe a /26), with a /24 or two routedto each server for hosted sites. What is the IPv6 equivalent? I can see a /64 for the common subnet, but what to route for aliased IPs forweb hosts? It is kind of academic right now, since our hosting control panel software doesn't handle IPv6, but I certainly won't be putting2^64 sites on a single server. Use a /112 here again as well? Use a/64 per server because I can?Why route them to the servers? I would just put up a /64 for the web servers and bind addresses to your ethernet interface out of that /64 as they are used by each site.I guess you might want to route them to the servers to save ND entriesor something on your router?In the past, we saw issues with thousands of ARP entries (it has been a while and I don't remember what issues now though). Moving a block fromone server to another didn't require clearing an ARP cache (and triggering a couple of thousand new ARP requests).
Yeah I figured as much.
Also, it is an extra layer of misconfiguration-protection: if the IPs are routed, accidentally assigning the wrong IP on the wrong serverdidn't actually break any existing sites (and yes, that is a lesson fromexperience).
I guess. The advantage of doing it with a single /64 for all of them is that you can move individual sites to other servers without much drama. That might not be useful for everyone of course.
-- Nathan Ward
Current thread:
- Re: ISP customer assignments, (continued)
- Re: ISP customer assignments Chris Adams (Oct 13)
- Re: ISP customer assignments Cord MacLeod (Oct 13)
- Re: ISP customer assignments James Hess (Oct 13)
- Re: ISP customer assignments Kevin Loch (Oct 13)
- Re: ISP customer assignments Leo Bicknell (Oct 13)
- Re: ISP customer assignments Chris Adams (Oct 13)
- Re: ISP customer assignments Leo Bicknell (Oct 13)
- RE: ISP customer assignments TJ (Oct 13)
- Re: ISP customer assignments Nathan Ward (Oct 13)
- Re: ISP customer assignments Chris Adams (Oct 13)
- Re: ISP customer assignments Nathan Ward (Oct 13)
- Re: ISP customer assignments Michael Dillon (Oct 15)
- Re: ISP customer assignments Chris Adams (Oct 15)
- Re: ISP customer assignments Nathan Ward (Oct 15)
- Re: ISP customer assignments Dave Temkin (Oct 15)
- Re: ISP customer assignments Rob Evans (Oct 16)
- Re: ISP customer assignments William Herrin (Oct 15)
- Re: ISP customer assignments Tore Anderson (Oct 16)
- RE: ISP customer assignments Wouter de Jong (Oct 14)
- Re: ISP customer assignments Joel Jaeggli (Oct 13)
- Re: ISP customer assignments Justin Shore (Oct 13)