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Web/Mail Server Behind Modem/Router

Need help in setting up a Web/Mail server behind a DSL modem/router.



7:38 am on May 29, 2003 (gmt 0)

10+ Year Member

I have been trying to set up a web/mail server (using same computer) behind a DSL modem/router. The modem/router has a static WAN IP and 5 static LAN IP's from SBC. The web/mail server is assigned to one of the LAN IP's.

The modem/router has been configured to translate the WAN IP to the LAN IP of the web/mail server (this is verified by the modem/router company). The DNS has been set up in the web/mail server to provide name resolution and www alias. A domain name (myhost.mydomain.com) has been registered and mapped to the router's WAN IP.

Internally (inside the LAN), typing www.mydomain.com will open up the website, and internal emails can be sent/received within the LAN. But externally (outside of the modem/router), typing www.mydomain.com does not work, while typing myhost.mydomain.com works fine. Additionally, external emails cannot be sent or received.

I have tried many different ways but did not work. If anyone has ideas or thoughts, please help me! Thanks a lot.


5:44 pm on May 29, 2003 (gmt 0)

10+ Year Member

It sounds to me like a DNS issue.
Internally, you are able to get to it because you have a static definition for the name record, or you point to a domain name service that has that name defined.
Externally, the name servers defined for the domain in question either do not have the correct records, or the externally used DNS cache has an old set of domain records cached that will need to be purged (done automatically) before it gets the new record.

If you give real names of domains and IP addresses, we could test it externally for you.

Hope that helps.



6:54 am on May 30, 2003 (gmt 0)

10+ Year Member

Thanks. The website is <snip>.

Does SBC need to register the domain name in its DNS database?

[edit: sorry, we're not allowed to post personal URLs here as part of the TOS. you can stickymail details if you like - thanks.]

[edited by: txbakers at 1:28 pm (utc) on May 30, 2003]


7:14 am on May 30, 2003 (gmt 0)

10+ Year Member

Sorry John, I forgot to mention that the server is NT4 with SP6.

How do you purge the internal/external cache? And where would be the external DNS server located?




4:14 pm on May 31, 2003 (gmt 0)

10+ Year Member

The domain name you sent has the following name servers set up to server domain records for the domain.


Neither of these appear to be properly serving domain records. If I lookup www.domain.name, it just hangs or times out. If I attempt to lookup MX records (mail exchange records, allows incoming mail for the domain, if the SMTP server is setup properly), it hangs or times out.

I can lookup the names listed above, but not the records you need. So, the maintainers of the above domain name servers need to fix their domain name servers. You have probably already done this, but you might also verify the registrar (Network Solutions) does not have any strange domain forwarding or e-mail forwarding features attached to the domain in question.

Hope this helps.



4:15 pm on May 31, 2003 (gmt 0)

10+ Year Member

Oh, and I believe this has nothing to do with SBC, unless you purchased the domain through them, and they are using Network Solutions for the domain registrar, and they have some strange forwarding on the domain.



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