Here's one for you guys.

I've got a Router setup which is my main connection - i live in Cambodia - so this connection drops offten. (several times a day)

I've a second router which i've connected to this router via lan (dhcp), which also has a backup 3G dongle - which it will fail over to when the wan is down.

They are both on different networks (192.168.1 and .2) - and both have dhcp on. and different ssids

I can connect to the secondary router (with the 3g Background) - with no problem - but can't connected to the main router over wifi for some reason - excsiting clients that are connected are fine.

Im guessing its because i've got 2 dhcp servers running - but ive tried disabling one and not the other - but being a complete noob - i'm not getting too far. as i'm not quite sure what im doing

Any idea what the best way to set this up? If i bridge them, then the second router won't fall back to the 3g (im guessing)

The reason why i'd like to seperate the 2 networks - is so that the any clients connected to the main router - won't use the 3g connection (as data costs is expensive) - so i'd like to select only a couple of computers to be able to use this router.

If someone can point me into the right direction i'd be most grateful.

I'm going to totally disregard your current set up and tell you how you should have it.

Consumer grade routers dont have active/standy failover capabilities, meaning that you cant have two consumer grade routers running at the same time on the same network. The set up you'll have is this:

- Have a single router, which acts at the default gateway and DHCP server for all clients on the network. This router will need to support WAN
failover. Thus, you will need a router with either a USB port that supports 3G capabilities to plug the dongle in, or have a WAN ethernet
interface from which you will plug into the router that supports the 3G dongle.
- Configure the primary router to failover between your main connection and the 3G connection.

An excellent router that supports all you need is the Draytek 2830 ADSL2+ router/modem. Its packed with useful features like remote access VPN, dynamic DNS etc. etc.

This is a job for hsrp or vrrp, get yourself a Cisco 1801 for your adsl connection, and an 1841 with a hwic-3g-gsm for your 3g connection, connect both routers to a switch, any switch, and run vrrp or hsrp between them, use ip SLA with track objects to effect failover and failback.....just my 2 cents


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