Re: [homenet] New Version Notification for draft-barth-homenet-wifi-roaming-00.txt
Tore Anderson <tore@fud.no> Mon, 30 November 2015 13:08 UTC
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Date: Mon, 30 Nov 2015 14:08:39 +0100
From: Tore Anderson <tore@fud.no>
To: Steven Barth <cyrus@openwrt.org>
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Subject: Re: [homenet] New Version Notification for draft-barth-homenet-wifi-roaming-00.txt
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* Steven Barth <cyrus@openwrt.org> > here is some attempt to formalize a simple WiFi roaming approach > using host routes and a stateless proxy for DAD NDP messages. > > It's a bit theoretical right now but may be useful as a start for a > discussion. We could do a talk on it in Yokohama as well. Hi Steven and thanks for this! It's a problem it's important to solve. Some questions/thoughts after a very quick skim through: > A router MUST listen for all Neighbor Solicitations with a target > addresses from an assigned roaming prefix having the unspecified > address as the source address. Similarly it MUST listen for all > Neighbor Advertisements with a target address from an assigned > roaming prefix and having the all-nodes multicast address as the > destination address. > > A router MUST forward all such messages via global unicast to all > other routers having roaming interfaces sharing the roaming > prefixes the target address of the respective message belongs to. (Similar language in section 3.2.) Do I understand correctly that this will only happen for NS packets destined for the globally scoped address? That is, no proxying of the DAD messages for link-local addresses? Assuming clients don't re-start DAD after having roamed from one BSS to another, isn't that a problem? > The IPv6 address fe80::1 SHOULD be used as fixed link-local > address exclusively by the router on roaming interfaces. Isn't a more appropriate address to use for this the subnet-router anycast address, i.e., fe80::? See RFC4291 section 2.6.1 - the intended usage seems to be quite fitting for your use case: The Subnet-Router anycast address is intended to be used for applications where a node needs to communicate with any one of the set of routers. Finally: > Stateful DHCPv6 MUST NOT be used to avoid the need to synchronize > lease information and relay DHCPv6 packets. What about DHCPv6 Prefix Delegation? Not supported? I think there is a use case for supporting PD to wireless clients if possible (think virtual machines, 464xlat, etc.) Tore
- Re: [homenet] New Version Notification for draft-… Steven Barth
- Re: [homenet] New Version Notification for draft-… Alexandre Petrescu
- Re: [homenet] New Version Notification for draft-… Ray Hunter (v6ops)
- Re: [homenet] New Version Notification for draft-… Mikael Abrahamsson
- Re: [homenet] New Version Notification for draft-… Michael Thomas
- Re: [homenet] New Version Notification for draft-… Ray Hunter (v6ops)
- Re: [homenet] New Version Notification for draft-… Mikael Abrahamsson
- Re: [homenet] New Version Notification for draft-… Dave Taht
- Re: [homenet] New Version Notification for draft-… Mikael Abrahamsson
- Re: [homenet] New Version Notification for draft-… Ray Hunter (v6ops)
- Re: [homenet] New Version Notification for draft-… Mikael Abrahamsson
- Re: [homenet] New Version Notification for draft-… Ray Hunter (v6ops)
- Re: [homenet] New Version Notification for draft-… Mikael Abrahamsson
- Re: [homenet] New Version Notification for draft-… Steven Barth
- Re: [homenet] New Version Notification for draft-… Mikael Abrahamsson
- Re: [homenet] New Version Notification for draft-… Dave Taht
- Re: [homenet] New Version Notification for draft-… Tore Anderson
- Re: [homenet] New Version Notification for draft-… Mikael Abrahamsson
- Re: [homenet] New Version Notification for draft-… Dave Taht
- Re: [homenet] New Version Notification for draft-… Mikael Abrahamsson
- Re: [homenet] New Version Notification for draft-… Dave Taht
- Re: [homenet] low latency handovers in wifi (was:… Alexandre Petrescu
- Re: [homenet] New Version Notification for draft-… Juliusz Chroboczek