On Wed, 2012-06-06 at 10:35 -0400, Jean-Francois.TremblayING@videotron.com wrote:
The ND noise generated is arguably higher than ARP because of DAD, but I don't remember seeing actual numbers on this (anybody?). I've seen links with up to 15k devices where ARP represented a significant part of the link usage, but most weren't (yet) IPv6.
That doesn't sound right to me. a) DAD only happens when an IPv6 node is starting up. ARP happens whenever a node needs to talk to another node that it hasn't seen in while. b) DAD only goes to solicited node multicast addresses, i.e., only to those nodes that share the same last 24 bits as the target address. ARP goes to every node on the link (broadcast). c) Similarly, ND (the direct equivalent of ARP) goes only to solicited node multicast addresses, ARP goes to every node on the link. So I'm not sure how DAD traffic would exceed ARP traffic. Regards, K. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Karl Auer (kauer@biplane.com.au) http://www.biplane.com.au/kauer GPG fingerprint: AE1D 4868 6420 AD9A A698 5251 1699 7B78 4EEE 6017 Old fingerprint: DA41 51B1 1481 16E1 F7E2 B2E9 3007 14ED 5736 F687