So someone requests the URL of your website, their DNS service say "hey buddy that sites on 212.213.220.10" (or whatever it is) so their pc sends HTTP request message on port 80 to your router, your router goes: "hmmm http packets on port 80..." looks up it's nat table finds your webservers internal ip and throws the packets down the wire to the webserver, all being good webserver responds.

I havent look because I am not at the site yet- but the old ip address that was assigned to the website does not work- I can access the website internally with 192.168.1.2 but not from the outside which used to be 68.153.179.75
for www.emailacheck.com

Right if nslookup still gives 68.153.179.75 your problem is DNS you need to choose which of your new ip's is gonna be for your website, go to the people you bought your domain name from and plug in the new ip then sit tight for 48 hours.

Thanks for your patience. I will do that. let you know how it goes.

ok so the nslookup turn this out:

C:\Documents and Settings\Administrator>nslookup
DNS request timed out.
timeout was 2 seconds.
*** Can't find server name for address 205.152.0.5: Timed out
Default Server: UnKnown
Address: 205.152.0.5

>

Address: 205.152.0.5

If you type: 'ipconfig /all' (without the quotes) at the command prompt is the above address the one set for DNS ?

If so the PC you did nslookup on can't get to it. Is the default gateway set correctly in network settings for that PC? (Typically this will be the internal address of your router)

Who did you register www.emailacheck.com with? you need to contact them and get the DNS records sorted to point to one of your routers external IP's issued by your ISP.

ipconfig/all
Server: UnKnown
Address: 205.152.0.5

DNS request timed out.
timeout was 2 seconds.
*** Request to UnKnown timed-

registered with register.com
this is their answer:

As per our records, the current DNS for the domain name are

auth00.dns.bellsouth.net
auth01dns.bellsouth.net
auth02.dns.bellsouth.net
You will have to contact your hosting service provider for more information on changing the IP address for the domain name.

on the pc network settings the dns is setto:

192.168.1.254 (routers address)
alternate: 68.51.8.3

thats on connection 2
on connection 1 (which is not connected)

dns: 205.152.0.5

If connection 1 is not connected you should disable it in control panel.

I am unable to get any ip address for www.emailacheck.com DNS tells me it doesn't exist. Normally you register a domain name as part of a website hosting service, typically that account has a login and password where you can administer your dns records do you not have that in your files?

Is www.emailacheck.com supposed to be public or is it just for certain staff/customers ? if you just set up the nat on your router as we dicussed earlier anyone who knows the external IP on your router that nats through to your webserver can browse the site from http://xxx.xxx.xxx.xxx/site_name
where xxx.xxx.xxx.xxx is the external IP on your router that nats to the internal address of the webserver. DNS is only required if people need to be able to browse the site using the domain name www.emailacheck.com.