Networking newb here… I seem to be having an odd networking issue.
When I am using a PC/laptop/Smart phone on my local network I am unable to access web pages (or email) on my network server using the FQDN.
Here's the set-up:
- Domain name provider that points to the static IP address e.g. example.com points to 222.111.111.001
- Fixed IP router address: e.g. 222.111.111.001
- dd-wrt router: 192.168.1.1 It has port-forwarding to the Ubuntu server which seems to work as it serves pages, etc to non-local ip addresses. Local machines are issued ip address via DHCP in the 192.168.1.100 to 149 range.
- Ubuntu 10.04 server on 192.168.1.150
- Clients include Linux mint machines, Android phone and get addresses such as 192.168.1.104
If I am on a client on the local network ( 192.168.1.104) and I try to navigate to a webpage on example.com/index.htm then the request times out.
The same sort of thing applies to email – If I am connected on the local network (wirelessly) then I cannot access the IMAP and SMTP servers using mail.example.com
The situation is fine if I am using a non-local network (e.g. my Vodafone mobile network). The device will successfully load example.com/index.htm
The situation is also ok if I navigate to 192.168.1.150/index.htm
Any thoughts on how to trouble shoot this one?
It's obviously a little annoying…
Cheers.
Best Answer
I think you're misunderstanding how DNS lookups work.
The public domain name that your URL is pointing to is a data record that is offered to the public. It doesn't have anything to do with the DNS service available on your local network.
Check your DD-WRT to make sure that you have a DNS server configured. Try using Google's at 8.8.8.8 and 8.8.4.4 for testing that.
If you don't have a DNS server configured in your DHCP service, your devices can't resolve FQDNs on the devices that have received IPs from the router.