OK, long story short, we have 30 branch offices all with drayteks (different version, but all on the latest firmware). We have them all linked via IPSec VPN's to a fire 750e at out head office, no problem there

Now, we want to tunnel all internet traffic from the remote offices through head office, again no problem there, the company that set the firebox up told us to change the remote network ip and the remote network gateway to 0.0.0.0 and put a tick in the box that says change default route to this vpn tunnel. The test site we used worked absolutely fine, but as soon as we try and do some other sites the draytek modems stop responding to anything external. It does make the vpn connection periodically, but we can't get access to the draytek when it up, we can't use the external IP address to remote access it and we can't make a pptp user vpn to get on either.

Any ideas, as I said we have got it working at one site, but other sites with exactly the same modem and firmware don't work.

Any help would be gratefully appreciated.