One computer can't connect to local network

[A Hyena]

I'm in charge of the network for a two day lan hosted at my school and as a result I have to connect a bunch of random computers together.

The computers are connected via two interconnected switches that all the computers connect to, due to the lack of WiFi this Is the easiest approach.

At first very few computers could actually connect to each other, I quickly figured out why, with no DHCP server all the computers were just using whatever IP and subnet mask that they used last time.

I quickly remedied that, I manually applied the same subnet mask to all computers and made sure all the IP numbers were uniform.

That seemed to work at first, almost everyone could connect to each other and play together just fine.

However one computer wasn't able to connect to anyone, this person was able to connect just fine before we changed the IP's so I know that the network card itself is probably fine.

Arp -a shows a bunch of random IP's which don't belong to any of the other computers and don't confirm to the ip standards I applied to the computers.

Here's what I've done so far (or what I can remember)


Tried switching IP's and ports

Tried connecting to both switches, neither worked

Uninstalling the device and restarting the computer several times

Firewall and antivirus are disabled

Tried disabling all other network adapters

Tried several different CAT cables

 

[COLGeek]

Are you using dhcp or manually setting IP addresses? How many total systems are connected to your network?

 

[A Hyena]

We have about 15 computers in total, I set the IP's manually

 

[COLGeek]

Closed net or do you have an Internet connection?

 

[A Hyena]

Completely closed, no outside connections

 

[COLGeek]

Also, for the system giving you trouble, does it also have an alternate ip configuration in place?

 

[A Hyena]

Nope, I just went into the ethernet adapter ipv4 settings and changed the ip address and subnet

 

[COLGeek]

Double check that you don't have a default gateway entry that doesn't match others.

 

[COLGeek]

Can other devices ping the ip if the problem rig?

 

[A Hyena]

I didn't put in a default gateway and no other computers can ping the computer