nanog mailing list archives
Re: IPv6 could change things - Was: DMCA takedowns of networks
From: "William Pitcock" <nenolod () systeminplace net>
Date: Tue, 27 Oct 2009 18:29:18 +0000
To expand on this from a programmers perspective, usually at the kernel/network stack level, a "patricia" radix-style trie is used for fast ipv6 lookups. The benefit of the patricia trie being that if you only have a difference keylength of 8 bits (/120) then the ip lookup only takes 8 steps in a worst-case scenario. The same concept applies to ipv4 cidr as well, but it is less obvious. William ------Original Message------ From: Adrian Chadd To: Jeroen Massar Cc: North American Network Operators Group Subject: Re: IPv6 could change things - Was: DMCA takedowns of networks Sent: Oct 27, 2009 10:39 AM On Tue, Oct 27, 2009, Jeroen Massar wrote:
But yes, the network stack itself is a different question, then again, you can just route a /64 into the loopback device and let your apache listen there... (which also allows you to do easy-failover as you can move that complete /64 to a different box ;)
Funny you should mention that. A couple of tricks I've seen: * instead of a linked list and O(n) searching of interface aliases, use some kind of tree to map local IP -> interface. * hacks to do a "bind to all damned IP addresses and let userspace sort it out". I've done the former for a few thousand aliases with no degredation in performance. The hacks available for freebsd-4.x for the Web Polygraph software did something similar. 2c, Adrian -- William Pitcock SystemInPlace - Simple Hosting Solutions 1-866-519-6149
Current thread:
- Re: IPv6 could change things - Was: DMCA takedowns of networks, (continued)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Jeffrey Ollie (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Jeroen Massar (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Adrian Chadd (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Jack Bates (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Mark Smith (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Jeroen Massar (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Ray Soucy (Oct 27)
- RE: IPv6 could change things - Was: DMCA takedowns of networks Brian Johnson (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Joel Jaeggli (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Jeffrey Ollie (Oct 27)
- Re: IPv6 could change things - Was: DMCA takedowns of networks Chris Adams (Oct 27)