nanog mailing list archives
Re: The stupidity of trying to "fix" DHCPv6
From: Joel Jaeggli <joelja () bogus com>
Date: Mon, 13 Jun 2011 13:57:32 -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.)
by default the multicast rate is at the lowest supported rate on the ap which negatively impacts the performance of everything else.
--Ricky
Current thread:
- Re: The stupidity of trying to "fix" DHCPv6, (continued)
- Re: The stupidity of trying to "fix" DHCPv6 Leo Bicknell (Jun 12)
- 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)