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NAT server and Microsoft exchange.

By alfaedh ·
Previously, they used PIX firewall (cisco) as a gateway and now I have setup a NAT server as a gateway on Windows 2003 server. The NAT is working, well and the client are able to use Microsoft exchange server internally but cannot sent or receive massege outside the LAN. Please, I am confused on what step to take next and I am new to Microsoft exchange server, I would appriciate any advice or idea on this issue. thanks to all

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Router

by jwilliams In reply to NAT server and Microsoft ...

Hmm. What role does the router serve now? NAT is a way for multiple computers to share a single static IP. Setting up a server as the DHCP server to pass those address out and then using the router as the gateway is the normal way to go.

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Router as a gateway

by alfaedh In reply to Router

We dont have the router as a gateway. We used to have a PIX firewall (cisco) but there is a problem with it so it doesn't fuction. I have configured a NAT on the same machine that used to be a stand alone Microsoft exchange server, so the client could share one single Public IP from the ISP. How could I configure my machine for outlook client to be able to sent and receive external messages?

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Where is the PIX?

by SYNner In reply to NAT server and Microsoft ...

What role does the pix firewall play in the network now? Is it still in place? Where is your outside connection? What is the default gateway of your exchange server? What is the default gateway to the outside? What is the default gateway on the workstations?

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Re: Where is the PIX?

by alfaedh In reply to Where is the PIX?

The pix is not fuctioning and I have configured what used to be a stand alone exchange server as a NAT server to share the internet connection btw clients on LAN. the default gateway to the outside is the one given by the ISP and for the client, they use the NAT second card IP address as the gateway. Please send me more suggestions to my problem on how my outlook client should be able to sent and receive email from outside?

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You will need to set up

by Dumphrey In reply to NAT server and Microsoft ...

a static port translation from your outside interface on the WAN to you internal exchange interface. By default, nat routers drop all unsolicited incomming connections, which is a perfect definition of email.

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