Can only serve up web pages locally

[optimised]

I'm not sure whether I have a dns configuration error or server can't be reached remotely. I'm sure named is running.
I have been able to reach domains locally but not from an external pc on the internet.I can ping and ftp successfully.
What are some 'dig' commands that I could run to see if my nameservers can even be reached remotely.

I've tried these and recieved answers for them.
Dig @ip ns domain.com fine
Dig domain.com fine
Dig @localhost fine

What's interesting is that my ip address configured on eth0 is 172.x.x.x private address right. My isp provider supplied me with two public ip addresses 205.x.x.x which I have registered for my nameservers show using whois.
If I use the 205.x.x.x ip on eth0 then I lose internat connection. The isp assures me that other clients are
running web servers.

If I can ftp to my box using the 205.x.x.x that's what's confusing me. Would'nt the 205.ip needed to be used on the physical machine.

thks

[Monyong]

maybe your isp block port 80 for incoming traffic.

Had that same problem , can browse from inside but not from external. Found out today that 80 port got blocked by ATT.
ATT did it to its subscribers a few days ago because of the Code Red Worm.

[optimised]

That thought has crossed my mind they could be filtering port 80. Due to that fact I can ping and ftp to my server.