[141830] in North American Network Operators' Group
Re: The stupidity of trying to "fix" DHCPv6
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Sun Jun 12 09:45:09 2011
Date: Sun, 12 Jun 2011 06:45:01 -0700
From: Leo Bicknell <bicknell@ufp.org>
To: nanog@nanog.org
Mail-Followup-To: nanog@nanog.org
In-Reply-To: <F6578C9E-02A4-4C55-95E1-823BC24A2CFE@muada.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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In a message written on Sun, Jun 12, 2011 at 01:04:41PM +0200, Iljitsch van=
Beijnum wrote:
> But what's the alternative? Always run DHCPv6 even if there are no router=
advertisements or router advertisements with O=3D0, M=3D0?
Yes.
> Like I said before, that would pollute the network with many multicasts w=
hich 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. I have never heard of a network
brought to its knees from these requests. A single packet each
time a host boots is hardly a high PPS rate.
> And networks without RAs are very common. We call those networks "IPv4-on=
ly networks".
No, we call those server networks. I've seen lots of IPv6 networks with
RA's disabled and all static devices on them. Sometimes having hosts
dynamically get addresses and default routes is a bad thing.
> And in the current situation DHCPv6 without router advertisements is poin=
tless because you may get an address, but you have no place to send your pa=
ckets.
Which is what we would like to fix.
--=20
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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