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Exchange dialup and network connectivity

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by dschwein

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I have moved exchange 5.5 from an NT 4.0 machine to a Windows 2000 Domain controller. The Exchange account uses a dialup connection to send and recieve Email.There are also shared drives on this Domain controller. There are four sites located in four different cities all connected by fractional T1's and each city has its own Domain controller. Now that the dialup is working when it dials out it causes the remote sites to lose connectivity to the Domain controller with Exchange on it. When the dialup is finished connectivity to the Domain controller returns. The issue is only with the remote sites not the site that the Domain controller resides on. I would appreciate any thoughts anyone has.

5 replies

by rvkempen

I guess that your dialup thinks it is the default gateway, try setting up a more specific route, if you use bsmtp it will automaticly be pushed to your dial up connection, so you might try a host route rather than a default route in the routing and remote ras mmc.

A computer can have more than one default gateways, but this is oly done for fault tolerance, and the system will change between these two, so most likely, the server thinks your other domains are somewhere at your isp site, and itreturns the packets the wrong direction.

by stillatit

This works if the computer that your server is calling is either a mail server, or is a RAS server on the same segment as the mail server.

Go to the dial-up connection for the remote server, right-click and select properties. Go to the networkingtab. Select the TCP/IP protocol, and click properties. Click on the Advanced button. On the general tab, uncheck "Use default gateway on remote server."

If you are dialing the internet for mail and all of your other connections are hard-wired, you can use the route command to establish permanant routes from the server to each of your subnets. The command format is

ROUTE -P ADD MASK

If you have a segment at 192.168.3.0 and the router on your segment toget to that segment is 192.168.0.1, the comand would be
ROUTE -P ADD 192.168.3.0 MASK 255.255.255.0 192.168.0.1
You would do this on your DC for each wan segment on your network. This would cause all routing to your own destinations to use these specific routes, so that if the DC changed its default route temporarily, it would not matter.

Good luck.

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