On 19/08/2011 14:08, Tom Eastep wrote:
> On Fri, 2011-08-19 at 13:39 +0100, Ed W wrote:
>> Hi, I'm just trying to test my "multi-isp" setup and running into some
>> teething problems (shorewall 4.4.22)
>>
>> Firstly, I wanted to do a quick test using a wired + wireless
>> alternatives, but for convenience both devices are connecting to the
>> same network (192.168.105.0/24).
> 
> I recommend that you don't do that -- it will take much more time to
> work around all of the pitfalls in that configuration than it will to
> simply bring up the real configuration.

The problem is that I won't have control over the "real" configuration.
It's an appliance that I am building and as far as possible I'm trying
to build robust configurations that survive users doing unusual things

It's entirely probable to meet a situation where I have say a satellite
system sitting on 192.168.1.1/24 and a wifi connection to some internet
cafe on 192.168.1.1/24.  I want the user to agree (via web interface)
that the wifi connection is the cheapest option and then force route
everything via wlan1.

I really need to get absolute control over my routing for this setup.
Several of the network connections will have substantial costs and
surprises aren't desirable (think $10-100/MB)



I'm trying to prototype this using shorewall, but my thinking is, given:
known set of interfaces at boot (eth0-3, wlan1-2, PPP0-5), I can setup
my masquerading and firewalling once, then control routing using ipset
entries to control TC rules.  A daemon monitoring what interfaces are
alive can then be used to dynamically adjust the routing table.

Does this seem workable?  Any shortcuts to get there? How much can I
leverage shorewall to help.  Can I make use of the routing rules added
by the kernel?

THanks for any ideas

Ed W

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