wireless support of roaming between subnets ?

[Juan Rodriguez Hervella]

Thank you very much for your reply....see below

On Thursday 06 May 2004 15:01, Marco Molteni wrote:
> Hi Juan,
>
> On Thu, 6 May 2004 Juan Rodriguez Hervella <jrh at it.uc3m.es> wrote:
> > Hello,
> >
> > I'd like to try on some changes that I've made in our VoIP
> > testbed for mobility support at the application layer.
> >
> > If the user requires support for seamless voice communication during
> > active call sessions on the mobile UA, it is imperative that the
> > wireless LAN setup should support roaming across subnets, i.e. the
> > mobile host should obtain a different IP address if it reassociates
> > itself with an Access Point (AP) in a different subnet.
>
> I don't understand...
>
> If you want to keep your session at a layer above IP, you must
> *not* change IP address when you roam. You can achieve this with
> Mobile IP. I don't know about MIPv4, but MIPv6 is supported by
> KAME (http://www.kame.net/)

I don't wanna use MIP, what Im trying to test is a simple modification to
the UA to re-register when his IP address changes.

The soft hand-off implementation has been based on the
call flow for sending Re-INVITE in case of IP address
change, as you can read here:
http://www.iptel.org/info/players/ietf/callflows/draft-ietf-sipping-basic-call-flows-01.txt
(look for "Session with re-INVITE (IP Address Change)................62")

I haven't tested it yet, I have the bad habit of asking before trying it

I will read your references, thank you again !


>
> I would suggest trying the KAME mailing list.
>
> Regarding seamless handover and similar stuff, you should check the
> various IETF working groups, like
> MIPv6 Signaling and Handoff Optimization (mipshop)
> http://www.ietf.org/html.charters/mipshop-charter.html
>
> Otherwise, if you really want to do what you stated:
> > the mobile host should obtain a different IP address
>
> you are already all set for this: when the 802.11 card associates,
> you trigger a DHCP request to get a new address.
>
> Have also a look at the following thread:
> http://docs.FreeBSD.org/cgi/mid.cgi?39FE23FA-7F75-11D8-8F99-000A95CDA38A
>
> [..]
>
> > Where is it coded the wireless support on FreeBSD ? I'd like
> > to use FreeBSD-4.9 if that is possible....Besides, do I need to
> > try to apply the previous patch to support roaming ? Any
> > pointer or suggestion will be useful, of course.
>
> the patch you are referring to is for linux, so you cannot apply it
> to fbsd ;-)
>
> wireless support in fbsd uses a new unified framework called "wlan", start
> with "man wlan" on a freebsd-current machine, or look at
> http://www.freebsd.org/cgi/man.cgi
>
> source is at
> /usr/src/sys/net80211/
>
> Don't know about 4-stable.
>
> marco
> _______________________________________________
> freebsd-net at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"

-- 
******
JFRH
******

We are all worms.  But I do believe I am a glowworm.
		-- Winston Churchill