Hi list, i few month ago I played around with dos-new-ip6.c from the IPv6 Attack Toolkit of Marc Heuse (see http://thc.org/thc-ipv6/). The tool answers to any neighbor solicitation with an neighbor advertisement. Debian 6.0.5 sent the neighbor solicitation a few times, always receiving a neighbor advertisement for the desired address. After a few tries Debian just assigned the desired address. This was tested using a OpenVPN network with VMs using VirtualBox.
Cheers, Dominik On Sat, Aug 11, 2012 at 8:36 AM, Bob Hinden <bob.hin...@gmail.com> wrote: > Ole, > > On Aug 11, 2012, at 1:33 AM, Ole Trøan wrote: > >> Fred, >> >>> Call this "making sure I'm on the same page as anyone else"… >>> >>> RFC 4941 describes privacy addresses, and RFC 4291 describes an EID based >>> on a MAC Address. RFC 4862 describes stateless address autoconfiguration, >>> and uses RFC 4861's duplicate address detection mechanism. >>> >>> My question is: what happens if any of them discovers that it has created >>> an address that is already in use in the network? >>> >>> There would appear to be two options: >>> (1) "ah, OK, I guess I didn't really want to talk today" >>> (2) Following RFC 4941, guess again until one creates a unique address >>> >>> Is it fair to assume that implementations do DAD and follow (2)? >> >> implementations I'm familiar with do 1. >> it may be a fair assumption that if an address based on the MAC address is >> duplicate, the MAC address itself is a duplicate. > > True, but the odds of this happening are very low. I wonder if we have any > data on DAD detecting duplicate addresses and their cause. > > For example, has any seen any actual duplicate MAC addresses? It would be > good to collect some data. > > Bob > >> >> cheers, >> Ole-------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
