[clug] asymmetric routing

Chris Zhang chris.zhang.syd at gmail.com
Wed Aug 26 01:13:21 MDT 2009

If I make the phone the default gateway, wouldn't all traffic (both outgoing
and incoming) be sent through to that interface? What connections would be
ultilising the USB 3G connection?

I tested it and tcpdumped the traffic, it appears that the other IP (USB
connection) is not used.


On Wed, Aug 26, 2009 at 4:48 PM, Craig Small <csmall at enc.com.au> wrote:

> On Wed, Aug 26, 2009 at 04:11:03PM +1000, Chris Zhang wrote:
> > I am wondering if there is a way to tweak the routing table or the
> firewall
> > to dedicate all downloads through the USB dongle and keep my uploads
> through
> > my mobile connection? That is, for a normal tcp connection, all
> > acknowledgments get sent out via the phone 3G connection?
> Making the phone the default gateway would do it.  The problem is
> I'm not sure if the 3G will let you do this.  A standard network, sure
> you can often send packets with the "wrong" IP address as the source but
> I'm not sure 3G ones will let you do this.
> As far as the other network is concerned, you're spoofing the source
> address and a lot of places filter that.
>  - Craig
> --
> Craig Small      GnuPG:1C1B D893 1418 2AF4 45EE  95CB C76C E5AC 12CA DFA5
> http://www.enc.com.au/                             csmall at : enc.com.au
> http://www.debian.org/          Debian GNU/Linux, software should be Free
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