Re: Re: request help for MIPL on iPAQ with Familiar 0.6.1

um,

thanks, andreas, for these helpful suggestions. i'd like to point out,
however, that i think that you're making this sound much more difficult
than it really is.

the first issue that strikes me as critical is that the wireless card
can't see other router advertisements; if that's so, then none of this
will work. alas, it really only needs to see one at a time.

that said, the entire purpose of roaming across subnets is so the node
has access to the network -- at its home address, of course -- when it
loses its "normal" connectivity. in other words, you don't need a
handoff until you can't reach the router that's currently serving as a
gateway.

furthermore, if you have access points serving several subnets in close
proximity, it would be a really good idea if they have different
essids. if the default configuration the the 802.11 card is set to try
the essid associated with an access point on your home network, then the
thing should always wake up there and registration won't be a problem.

now, ifconfig and a host of other utilities come from busybox to save
space in the core familiar distribution. these are lightweight versions
that serve many people pretty well, but for some purposes you have to
replace them with the real apps.

as for this vital importance stuff about getting the card configuration
using the home address before seeing a router advertisement, see above.
i've never found it necessary to diddle the functionality that ipv6
provides; if all of this didn't work fairly seamlessly, then its value
would be greatly diminished: one of the beauties of ipv6 is that all of
this is just supposed to work -- and does! -- so when the card wakes up
on its home network, all of this will, in fact, just work.

so, put "ipv6" in /etc/modules; set the base essid in
/etc/pcmcia/wireless.opts if necessary; before you run
/etc/init.d/mobile_ip6, take a look at ifconfig and route -A inet6 to
check that your base network configuration makes sense, including
pinging another (full global) address.

cheers,

steve

On Thu, 2003-08-07 at 04:35, Andreas Rozek wrote:
> Good morning!
>
> >Thanks for your help. Now I can start the mobile-ip6
> >on my iPAQ. But the problem becomes that I can't make
> >it registered to the HA. The reasons may be as
> >follows:
> >
> >1. We have a lot of access routers around us. Some of
> >them are not controlled by us. So when I turn on an
> >iPAQ, I can't guarantee the iPAQ is in its home
> >network. Does it hurt the registration to HA?
>
> no - this is what "Mobile" IPv6 is good for!
>
> >2. The wireless card does not work in promiscuous
> >mode. It can't detect the router advertisement when it
> >changes its access router. Therefore, I can't get it
> >registered to the second access router when I change
> >my network.
>
> Ok - this is another issue - but let's look at the registra-
> tion first (see below)
>
> >Could you help me find the exact reasons? Do you meet
> >the the same situation before?
>
> Well, I'm not an expert for Mobile IPv6 - I'm just using it
> for my applications.
>
> But let me first add s.th. that I've forgotten yesterday:
>
> - the "built-in" commands like "ifconfig" etc. are NOT IPv6
> CAPABLE! (don't ask me why). You will have to install an-
> other package (which will overwrite the original commands)
> I'm using "net-tools_1.59-1_arm.ipk" for that purpose.
>
> Install this package, reboot your system and try my script
> again - sorry for any inconvenience this may have caused...
>
> Another important tip:
>
> as I've been told, it is of VITAL IMPORTANCE that the net-
> work interface card gets configured with its home address
> BEFORE it processes the first router advertisement!!!!
>
> If you don't get registered, one reason might be that the
> bunch of ARs sends so many RAs that my script simply isn't
> fast enough.
>
> In that case, try to block or inhibit any RAs when you re-
> initialize Mobile IPv6 on your iPAQ:
>
> - you may be able to temporarily switch off the RADs of the
> ARs
> - you may by able to temporarily disconnect your iPAQ from
> the ARs
>
> then reboot your iPAQ (this will remove IPv6) and restart my
> script (which starts IPv6 and MIPL). If you will be regis-
> tered after this procedure, you will know that the "density"
> of RAs has caused the trouble.
>
> In that case, you may have to try my script several times...
>
> But remember: ALWAYS REBOOT BEFORE RE-STARTING MY SCRIPT!
>
> (the "handover" is then another issue...)
>
> Good luck!
>
> Andreas Rozek Phone: ++49 (7031) 222305
> Bunsenstraße 80/1 Fax: -
> D-71032 Böblingen EMail: Rozek_at_GMX.De
> Germany URL: http://www.Andreas-Rozek.de
>
>
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Received on Thu Aug 07 2003 - 16:41:51 EDT