You say you have a linksys router?
They default to the ip at
http://192.168.1.1
try these to log in
Username:admin
Password:
U:admin
P:admin
U:admin
P:password
note the part underlined below, only do that if the above link does not work. you can ignore it otherwise.if the above link doesn't work, push these keys and type "cmd" in the box that shows up:

in the new black box that opens, type "ipconfig" and push the enter key.
Look for a section like this:
Ethernet adapter WIFI:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.43.174
Subnet Mask . . . . . . . . . . . : 255.255.255.0
IP Address. . . . . . . . . . . . : fe80::224:2bff:fe66:facd%11
Default Gateway . . . . . . . . . : 192.168.43.1
note the bolded parts for later, you don't have to post them here, as they don't matter to us.
take the part from the default gateway, and put that into your url bar at the top. you might need to put "http://" before it.this is a post at 1am, so i apologize for inconsistencies.
i might proofread it in the morning...