Network IP Problem

15 pts.
Tags:
Dell Optiplex
IP address conflicts
IP address management
Microsoft Windows XP
Network connectivity
We have two Windows XP computers on the same network. One with an IP address of 10.xxx.xxx.120, second one with an IP address of 10.xxx.xxx.121.  When the 120 unit is on the internet, the other unit can not get on. When the 121 unit is on it stops the 120 unit from get out. We have 50 other computers on the same network with out a problem.

Tried changing the IP address but get the same thing.  The only way we can get both on at the same time is to connect one unit to a router with auto IP.

The one unit has new hard drive with a new Windows install and first time set-up.



Software/Hardware used:
Windows XP - Dell Optiplex GX620

Answer Wiki

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Set them both as static within their network controls.

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Are the two units that are conflicting connecting through a hub? you mentioned “The only way we can get both on at the same time is to connect one unit to a router with auto IP” so that begs the question: what are they being wired into when they have the conflict?

Ramsey- Ya if they are connected to a switch in the same office and that switch is connected to one jack in that office make sure you have configured your main Switch in server room to allow give multiple IP’s and internet access from one Jack. This happens a lot with power over ethernet.

Discuss This Question: 6  Replies

 
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  • saturno
    Hi, can you please answer this? When in the only way you're able to connect both machines to the internet, what are each machine IP address? (WIndows: ipconfig /all // Linux: ifconfig) Which is the subnetmask of that network segment? Please let us know
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  • Mariodlg
    Hi, Tell us how the computer connects to the internet, are them using proxy ? some firewall/gateway?
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  • Ingram87
    Set both XP systems to get there IP from a DHCP server. Run "ipconfig /all" on both computers and post the output and which one of the 2 can get out to the internet. Also try to ping a public IP, like "ping 4.2.2.1" on the 2 and post the output as well. And if you want to take it one more step, run "tracert 4.2.2.1" and post the output as well. This will help us figure this out easier.
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  • Spadasoe
    ARP both machines to make sure we have unique MACs.
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  • Ron2106
    Both computers have differ MAC addresses! Both computers have Differ IP addresses! No Proxy! Some Firewall/Gateway! To connect to internet, I must unplug a network cable or plug one unit into a second router with auto IP.... Second router is set up on same network, but IP range is differ.
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  • Sixball
    Sounds to me like you're plugging the switch/hub directly into your cable/DSL modem without a router in between them. The modems typically only talk to one device at a time, thus the one PC works while the other doesnt. Your statement "The only way we can get both on at the same time is to connect one unit to a router with auto IP." indicstes that you're currently NOT using that solution. It might work best if you plug both devices into your switch then cable your switch to your router, not just a single PC...
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