How to send requests to different web servers with the same IP?

bistwo · Oct 23, 2015

I have two servers running under the same network, with only one external IP. How can I set up the servers so that they answer requests based on the subdomain requested? For example a.example.com goes to one server and b.example.com goes to another, but both requests are coming from port 80 to the same external IP?

Both web servers run Microsoft Windows operating systems and use IIS.

getochkn · Oct 23, 2015

What kind of "requests" are you sending?

bistwo · Oct 23, 2015

getochkn :

Port 80 http requests

jimmysmitty · Oct 23, 2015

Assuming you have a normal network, do you have a firewall that can be used to route traffic or a programmable switch?

bistwo · Oct 23, 2015

getochkn :

I have a router running the DD-WRT os

boosted1g · Oct 23, 2015

DD-WRT has no ability to do this. You will need a firewall device (could make a cheap Linux pc running pfsense) or a reverse-proxy.

little_me · Oct 23, 2015

well, you would need to differentiate the two servers by some means.
Both servers cannot run on same IP and port.

Now, as far as I understood the question, you have custom dns entries:
a.example.com that points to your routers external IP
b.example.com that points to your routers external IP

both IP's are same and as far as I know, no DNS entry can add custom port change to the end (a.example.com:81) to make the server be different.
Since IP traffic goes ONLY by numbers, Router only knows who the packet sender is, not what DNS entry it used to get router IP.
Based on that, what you are asking is impossible.
Your router will NEVER know if person asked for a.example.com, b.example.com or xyz.joke.com as long as it points to routers external IP.

You would need two external IP's or people would need to specify the 2nd server port as different when connecting:
a.example.com (for port 80)
a.example.com:81 (for port 81)

and then you would forward port 80 traffic to internal port 80 and port 81 traffic to internal IP/port you want.

edit: the post doesn't take into account if the router can do ip/port forwarding since even if it could, the situation as described by OP is impossible to attain since router will never know what DNS entry people requested the page with.

getochkn · Oct 23, 2015

I'm not sure how hosting companies do it, but they do it all with the same IP. When I had hosting, I had like 10 domains under 1 IP. It's all based on the sub-domain or domain name with DNS redirects, so that blahblah.com would go to /home/www/files/blahblah/ and woozwooz.com would go to /home/www/files/woozwooz even though woozwooz and blahblah were both hosted on the same machine and save web server. The dNS redirection allows it to tell it what subfolder to go to.

boosted1g · Oct 23, 2015

As stated, you need a reverse proxy server to go to two different local IP addresses.

Now if you have both of the websites on the same machine (and not different virtual machines) then you do as getochicken said and redirect it to the proper local path.

Search

How to send requests to different web servers with the same IP?

bistwo

Distinguished

getochkn

Polypheme

bistwo

Distinguished

jimmysmitty

Champion

bistwo

Distinguished

boosted1g

Titan

little_me

Splendid

getochkn

Polypheme

boosted1g

Titan

TRENDING THREADS

Latest posts

Moderators online

Share this page