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  • What type of cable are you using? For a network from a PC to another PC you need to use a cross over cable not a standard patch cable, is it possible one is cross over and one is not hence your problem?
    – CharlesH
    Commented Apr 14, 2015 at 8:06
  • I'm just doing a lab using gns3. So this topology is running in a virtual machine.
    – Zahrah
    Commented Apr 14, 2015 at 8:10
  • Oh ok slightly changes things...So can both PC1 and PC3 ping PC2 but PC1 and PC3 cannot ping each other? What subnet are they are all set too a Class C 255.255.255.0? Have you set a gateway on all three?
    – CharlesH
    Commented Apr 14, 2015 at 8:14
  • Will on of the PC's (either 1 or 3) can ping PC2. It depends who i configured first. For example, when i configured PC3 first and PC2. I was able to ping just fine. But when i added PC1, i couldn't. I set PC1 as 10.0.0.1/24, PC2 eth0 10.0.0.2/24, eth1 10.0.1.1/24. and PC3 as 10.0.1.4/24. I didn't set any gateway since i only want pc1 and 3 to be able to ping pc2 on their network.
    – Zahrah
    Commented Apr 14, 2015 at 8:20
  • Strange I cannot really see why this wouldn't work. What OS is PC2 running, Linux?
    – CharlesH
    Commented Apr 14, 2015 at 8:32