Hi folks,

I have a setup where I have 2 sites. The "SERVER-site" is connected to internet (DSL). The "CLIENT-site" is connected with a wireless bridge to the "SERVER-site" using Zyxel hardware. The bandwith between the sites is 15Mbit/s net.
Unfortunately wireless is not known to be very stable. Therefore I have set up a bridge (tap0) on OpenWRT 10.03.1 with 3G UMTS USB stick on Netgear WNDR 3700v2.
That all works well. (Ok, bandwith is just 50% if the 3G link is used, but that is acceptable.)

The question is how do I manage to automatically fail over to UMTS link in case wireless goes down?

Thanks a lot for your help.

Take e look into this thread https://forum.openwrt.org/viewtopic.php?id=26767
It's just an idea.

OpenWrt / [howto] Failover Capability script between two wan (DSL and 3G).

thanks for the answer(s)

basically I have seen that before, but it will not help me as both path I form a bridge into the same place. So the arp tables should be identical in any case. Furthermore it is a bit complicated to ifup the 3G interface and get connected to Internet as that requires a manual step of accepting a web page. You get redirected to that https webpage every 1st time you open a 3G connection and you have to klick the accept button to get real internet connection. (that is another struggle I have to fight against later) For the moment I was about to start the 3G connection once in the morning and leave it connected all day long to overcome that accept-issue.

I am wondering of there is no more smart solution than shutting down the interface. If the networks would be different I would use bgp, but as the nature of a bridge is that it all is the same network...

(Last edited by briearn on 2 Jan 2012, 17:49)

You could automate the login phase with a curl request triggered from /etc/hotplug.d/iface/, just an idea.