I have a client running an SBS 2008 network connected via Draytek adsl router / firewall.
Now the client has recently had installed a fibre link with managed cisco router & wants to implement the WatchGuard as their firewall.
Now I have never setup a Watchguard before so apologies if the questions are basic...
I have configured the WatchGuard using my laptop and gave given the WatchGuard the internal address of 192.168.3.253, the reason for me choosing this address is that currently the default gateway in the SBS environment is set to 253 so I thought to keep things simple I could set the WatchGuard’s internal IP the same as existing default gateway which would mean come switchover time I would not have to change anything on the SBS server as its still pointing to the same address for its gateway, am I correct in thinking this ?
I have configured the WatchGuard with the gateway & external IP provided by the new isp and I can gain access to the internet via my laptop as long as I configure the LAN card to be on the same subnet as the WatchGuard, however my laptop will only connect to the internet if I enter an external dns address such as 126.96.36.199, if I enter the internal ip of the WatchGuard on the dns settings then I am unable to access the net.
Basically I am trying to replicate the sbs environment on my laptop before the switch over and just wanted to know why the laptop needs an external dns address, I thought by pointing the dns server on my laptop at the WatchGuard’s internal ip then it would receive its DNS from the Watchguard?
Also any tips on how to open portrs on the firewall for smtp & rdp