Split horizon: DNS and VPN

Look at this article. It may be helpful

http://www.isaserver.org/shinder/tutorials/isaserver_smtpsupport.htm

(REMOVE SPACES from the pasted URL.)

It describes and illustrates:

Configuring DNS to support ISA Server

Configuring Protocol Rules to support the internal SMTP and DNS Servers

Configuring the SMTP Server Publishing Rule

Checklist: Putting it all together

Good luck,

Maxwell

My DNS is on linux 7.2 I'm not using windows for
anything other than the clients.

Your VPN can pass the address of the DNS server to the clients. You set this up in the dial-up config. Now if you have a firewall between your dial up network and the trusted network you are going to have to allow DNS through this firewall so the clients can issue the query to the DNS server. You are also going to have to allow SMTP if the SMTP server is on the trusted network so the mail can be passed through this server. You should only allow the dial-up subnet access to the trusted subnetand only for DNS (port 53) and SMTP (port 25).

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