Network not detecting Ubuntu server

[Harinder]

I just recently bought a new modem and a new router to replace my old Xfinity modem. When I connect the server via ethernet to the new router it does not show up in the device list in the router menu. And when I try ifconfig -a it shows the inet addr to be the old ip (10.0.x.x) where the new one should be 198.168.x.x. It's been awhile since i set up that sever.. Are there some config files that I have to edit for it to be on the new network? 

[Electronics Wizardy]

you  probabaly seta static ip, so edit /etc/network/interfces and change the ip.

[fjdhdhcyfhf]

6 minutes ago, Harinder said:

I just recently bought a new modem and a new router to replace my old Xfinity modem. When I connect the server via ethernet to the new router it does not show up in the device list in the router menu. And when I try ifconfig -a it shows the inet addr to be the old ip (10.0.x.x) where the new one should be 198.168.x.x. It's been awhile since i set up that sever.. Are there some config files that I have to edit for it to be on the new network? 

what is the server os? you prob want to look at the /etc/network/interfaces file

[Harinder]

That was it, thanks!