Just need help in filling the gaps here or advising where necessary. I didn't put all of this together, I've kinda jumped in where someone was having major problems along with the network being all over the place and wide open, so I've got it secure and working to a point.
I setup a Gateway machine (Two NICS as required) with Firewall. Internet side is connected to Broadband Router which is connected to ADSL with a static IP address that has been assigned about 14 addresses.
LAN side is on a class A network (10.0.0.x), should really be a Class C I know, but that's what we're working with for now. LAN is a W2K Domain. Gateway machine is assigned IP address 10.0.0.34. On LAN is the Mainserver which is 10.0.0.1 which is also running MS Exchang. It's working fine internally, but hasn't really been setup to pick up (or sit and recieve) e-mail from the outside yet.
Using the DHCP server with firewall to assign addresses and all appears to be working correctly. Firewall tests on the LAN look good.
I here have no real knowledge of Exchange or how it routes out to the network. So please bear with me!!!
Desktop PC's on LAN are surfing away quite happily and Firewall/Gateway/Filtering etc is working nicely !! However, what sort of considerations and rules should be considered for the Exchange box to work correctly (or indeed what is the correct state for the Broadband router, etc). Any advice and steps taken by anybody setting up this type of setup would be helpful.
Any help would be appreciated.
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