nanog mailing list archives
Re: The stupidity of trying to "fix" DHCPv6
From: Owen DeLong <owen () delong com>
Date: Tue, 14 Jun 2011 01:00:22 -0700
On Jun 13, 2011, at 12:50 PM, Ricky Beam wrote:
On Sun, 12 Jun 2011 09:45:01 -0400, Leo Bicknell <bicknell () ufp org> wrote:In a message written on Sun, Jun 12, 2011 at 01:04:41PM +0200, Iljitsch van Beijnum wrote:Like I said before, that would pollute the network with many multicasts which can seriously degrade wifi performance.Huh? This is no worse than IPv4 where a host comes up and sends a subnet-broadcast to get DHCP.Broadcast != Multicast. esp. when talking about wireless chipsets. I've yet to find a wifi chipset that didn't completely fuck-up when presented with even a low pps of multicast traffic. Broadcast traffic doesn't seem to bother them -- it doesn't attempt to filter them in any way, or really pay them any attention. If I had to guess, the chip firmware is individually transmitting multicast packets to each peer; a broadcast packet is sent once to all peers. I've not had any wireless networks disrupted by broadcast traffic -- and with Radware load balancers in the network, there are *plenty* of broadcasts (ARP). Just a few 100pps of multicast and the AP fails. (linksys, netgear, even cisco... all broadcom crap radios.) --Ricky
You would need an AWFUL lot of hosts for this to add up to a few 100pps (or even 10pps) of multicast traffic. Owen
Current thread:
- Re: The stupidity of trying to "fix" DHCPv6, (continued)
- Re: The stupidity of trying to "fix" DHCPv6 Jimmy Hess (Jun 12)
- RE: The stupidity of trying to "fix" DHCPv6 Kelly Setzer (Jun 13)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 13)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 13)
- Re: The stupidity of trying to "fix" DHCPv6 Leo Bicknell (Jun 13)
- RE: The stupidity of trying to "fix" DHCPv6 Kelly Setzer (Jun 13)
- Re: The stupidity of trying to "fix" DHCPv6 Joel Jaeggli (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 16)
- Re: The stupidity of trying to "fix" DHCPv6 Ricky Beam (Jun 13)
- Re: The stupidity of trying to "fix" DHCPv6 Joel Jaeggli (Jun 13)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Mikael Abrahamsson (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Mikael Abrahamsson (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Nick Hilliard (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Ricky Beam (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Ricky Beam (Jun 14)
- Re: The stupidity of trying to "fix" DHCPv6 Owen DeLong (Jun 14)