Multiple internet connections

[Joel Newkirk]

On Tue, 13 Jan 2009 16:48:18 -0800, Sargun Dhillon
<xbmodder+openmoko at gmail.com> wrote:
> So, this is probably  better for the support list, but, what you're
> talking about is possible.
> Also, university is useless, getting yourself kicked out may actually be
> useful.
> Howto:
> Create two routing tables
> echo "20 gprs" >> /etc/iproute2/rt_tables
> 
> ip route add default via $PPP_ENDPOINT dev ppp0 table gprs
> ip rule add from $PPPADDRESS lookup gprs
> 
> then keep the other routing table in place, you can manipulate that
> without knocking out your PPP connectivity.


Caveat:  You can't accomplish this with the busybox-as-'ip'-replacement
used by default on the FR, you need the complete iproute2 version. 
(busybox version doesn't support 'table' or 'rule')   I've not noticed if
it's made it into a feed yet, I always install
http://newkirk.us/om/iproute2_2.6.26_armv4t.ipk which I built a few months
ago and keep at the 'FR stuff' link in my sig.

j

 
> On Tue, Jan 13, 2009 at 4:34 PM, Al Johnson
> <openmoko at mazikeen.demon.co.uk> wrote:
>> On Tuesday 13 January 2009, Leonti Bielski wrote:
>>> Hello!
>>> Is it possible to use multiple internet connections on Freerunner at
>>> the same time?
>>
>> There are several possible ways depending on circumstances. Bridges,
> routes or
>> iptables rules could all do this to some degree. Now would be a good
> time to
>> start reading linux networking howtos and documentation.
>>
>>> Say I want to use ssh via GPRS, and all other programs via WLAN or
>>> usb. Is it possible?
>>
>> I think it could be done with packet marking and some interesting
> iptables
>> rules. If you know what ports the app uses then it would be easier. You
>> probably don't really want to do this though.
>>
>>> Real life example - in my university we have very good unlimited WiFi,
>>> actually 2 of them. In my dormitory room I have connection limited by
>>> proxy (no torrent :().
>>> What I want to do is to leave my FR at school at some place safe,
>>> connect it to wall charger, insert 4GB memory card in it, and turn on
>>> gprs connection.
>>> Then I would go home, log in to my phone via GPRS, then connect to
>>> WIFI and start downloading some stuff via torrent on my memory card.
>>> Neat :D
>>
>> If you know your home IP address, or address range, you can set the
> default
>> route to be via wifi, but the route to that address or range to be via
> GPRS.
>> There is a problem though; with the telcos in the UK the GPRS connection
> is
>> usually on NAT, so you can't actually ssh into the phone over GPRS. You
> could
>> probably get the phone to initiate an openvpn connection to your home
> and
>> keep the connection open though, and you could then ssh in over the VPN.
> Or
>> you could make a standard modem-style GSM data call to the phone and use
>> screen to keep your session running when you end the data call.
>>
>> BTW this would probably violate several points of your university
> acceptable
>> use policy, and in some places would be enough to get you kicked out.
>>
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> 
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-- 
Joel Newkirk
http://jthinks.com      (blog)
http://newkirk.us/om (FR stuff)