Date: Thu, 6 May 2004 15:01:32 +0200 From: Marco Molteni <molter@tin.it> To: freebsd-net@freebsd.org Subject: Re: wireless support of roaming between subnets ? Message-ID: <20040506150132.2d545eda@localhost> In-Reply-To: <200405061342.33101.jrh@it.uc3m.es> References: <200405061342.33101.jrh@it.uc3m.es>
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Hi Juan, On Thu, 6 May 2004 Juan Rodriguez Hervella <jrh@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 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
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