I have a small network with an app server that we connect to using internal IP (192.168.20.xx) using DSL. After switching to a Frame Relay type of service with the new (TCP/IP) configuration (IP, DNS, Subnet Mask), my internet of course is faster but I am now unable to connect to my application server. However, if I make no changes on each computer with it's IP configuration and leave it on "Obtain an IP address automatically"--I am able to connect with my application server but not able to surf the internet. Is there a way of keeping my internal IP's and be able to connect to the internet?
Well I don't fully understand the situation here, but my assumption is that your workstations and app server are on your LAN and you LAN is connected to the internet via a router.
You must ensure that you app server and workstations are both in the same subnet, e.g. both have 192.168.20.xx addresses with 255.255.255.0 masks. Your internet connection router should also have an address in this subnet. Because this router is your link to the outside world this is your gateway, so it's address should be used as the default gateway for your PC and app server.
To add to what David said, which is all correct, many DSL modems will give an IP address in the 192.168.0.0 network (255.255.255.0), and set the IP address of its internal interface to 192.168.0.1. This would leave you unable to contact your application server at 192.168.20.xx. Unless your DSL modem allows you to configure which IP addresses are handed out via its DHCP server, you're left with the option of changing the IP address of your server to match the subnet handed out by the modem, and let your PCs get their IP addresses automatically.
Your router's ethernet IP / Subnet mask are in network 220.127.116.11/255.255.255.224, which means that ligitimate IP addresses for your LAN are 18.104.22.168 - 22.214.171.124.
You router has the address 126.96.36.199, so you need to be assiging addresses to your workstations and application server other addresses in this range, with the subnet mask of 255.255.255.224. The default gateway for your workstations/app server should be that of the router 188.8.131.52.
Somewhere on your LAN you have a DHCP server, you can see from your config that it's not running on the router. Either you statically assign the above addresses to you devices or you could reconfigure the DHCP server to give out your free IP addresses.
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