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Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option

Roy Marples <roy@marples.name> Thu, 05 December 2019 15:01 UTC

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To: Lorenzo Colitti <lorenzo=40google.com@dmarc.ietf.org>, "<mohamed.boucadair@orange.com>" <mohamed.boucadair@orange.com>
Cc: "dhcwg@ietf.org" <dhcwg@ietf.org>, V6 Ops List <v6ops@ietf.org>, Bjørn Mork <bjorn@mork.no>, "draft-link-dhc-v6only@ietf.org" <draft-link-dhc-v6only@ietf.org>
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From: Roy Marples <roy@marples.name>
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Date: Thu, 05 Dec 2019 15:00:53 +0000
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Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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On 05/12/2019 09:11, Lorenzo Colitti wrote:
> Note that IPv6 has built-in delays in the protocol itself (DAD for the 
> link-local address; various randomized delays) that make it very 
> difficult to get anything done before at least 1-2 seconds have passed. 
> Hosts that know that 70% of networks are IPv4-only will not want to wait 
> 1-2 seconds to connect to those networks.

IPv4 has built in delays as well. DHCP delay randomisation and DAD 
timings via RFC 5227.
NetBSD has RFC 5227 in the kernel and works very nicely.

I once saw a PDF that claimed Solaris does the same, although my hands 
on experience says if it does work it uses timings different from the RFC.

Roy

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