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Static IP question

earthman

earthman

Golden Member
If I have two computers that are networked behind a firewall/router that has a static IP, and does DHCP, to have one of the computers use DHCP for its IP while the other one is static? I have the static IPs available, and I need one machine to have one for a webserver...but is this possible with a router that has DHCP enabled? I admit I am not a networking guru.
 
It is a little confusing. (You should call The ISP IPs external and the LAN IP internal).

As for internal IPs you can put one computer on DHCP and one computer with static Internal IP.

Restrict the DHCP values to (example) 192.168.1.1 to 192.168.1.10 and give the second computer 192.168.1.20

You can not use External IP beyond the Router in the inside LAN.


 
When u make the one computer static on the LAN, remember u MUST configure everything including gateway IP ( LAN IP of your router), DNS servers (check your router WAN settings to get them), etc.
 
you can enable DHCP on the router and still assign a PC a static internal IP.

If you're only going to have one of the PCs be a webserver, just give them both static internal LAN IPs and then on the router, map the right ports to the webserver.

it would help if you let us know what firewall / router you are using.

 
Ok here is an update. I gave up on the router for the moment, because I can't get it to work. We are running software on the server that needs two way traffic in and out to a static ip. With IP forwarding set up from the Router, it works fine coming in, but nothing goes out. I know that doesn't make sense, but its whats happening. I took the router out of the loop and put the computers back on static external IPs through a Cisco 678 (whose configuration I don't know at this point, I don't have the password) Now the application works, but the systems are exposed again. We have been the victims of hacking and trojans and its getting old. I tried a software firewall which hid the server really well but that also blocks the inbound traffic, it didn't have the option to allow any selectivity there. I am hoping to find out what ports this software requires, they said just 80, but with filtering on for everything except 80, it didn't work at all. I don't know if I can get specific data about this software or not. It is proprietary and expensive...its used for dispatching and tracking deliveries using web enabled cell phones, and is tied to a Microsoft SQL database.
 
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