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[gservat at gmail.com]

Hi All,

I'm running FS on a dual-nic box on a simple home network with a twist (see attached network diagram). I drew up the network diagram as I thought it'll help explain what I'm trying to achieve.

A note on the diagram: the reason why the uplink exists between the switch and the router is simply because the ISP on the FS box (eth1) is quite unstable, so I've got a backup link to another connection which I manually bring up & down when needed (basically involves changing the default gateway to 192.168.1.1 on the FS box)

I have a dynamic DNS host (which is the value of my FS "domain") which is tied to whatever IP the FS box is assigned on eth1.

When the connection is up and running normally on eth1, everything is fine. PC1 or PC2 can run a SIP client and connect to the FS box using the dynamic DNS host as the server/domain. The problem comes in when eth1 is down and PC1/PC2 start using 192.168.1.1 as the gateway. The dynamic host would resolve to some external address (the last addressed assigned by the ISP before it went down), which means the connection would go out to the internet and attempt to come in via the FS box, which fails as the connection is down.

Since I'm fairly new to FS and given that it's a fairly abnormal setup, I'd appreciate what you guys think would be the way to configure my domain and SIP profiles so that I can register locally to FS as well as when I'm on the road (ie. from the Internet, without using a VPN)

Thanks in advance and I hope the above made sense. I feel I'm complicating things here as it's not a difficult setup, but I guess my lack of FS knowledge doesn't help!
- Gonzalo