Is it firewall issue or not ?

eemoon
eemoon used Ask the Experts™
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Hi I connect two PC(Win7) with one cable. The two NIC have same subnetwork static ip address. The two PC cannot ping each other. Do you think if it is firewall issue ? Thank you.
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Russ SuterSenior Software Developer
Commented:
I'm not certain but it sounds like you're attempting to direct connect two PCs using a single network cable and no switch, router, or hub between them. If this is the case you will need to use a crossover cable. Normally switches do this for you but in this case you just have a cable going from one PC to the other. The transmit and receive lines need to be crossed over for the two to talk to each other or else they will both be transmitting on the same line and receiving on the same line.

https://en.wikipedia.org/wiki/Ethernet_crossover_cable

http://www.amazon.com/Belkin-CAT5E-Crossover-Cable-feet-Red/dp/B000067RFT
Most Valuable Expert 2015
Commented:
same subnetwork static ip address

I'm not sure how to interpret that. Do you mean both NIC's have the same IP? If yes, then it won't work. Never use the same IP for 2 devices connected on the same LAN. IP's must always be unique for a device.

Otherwise, a crossover cable might be, but doesn't have to be an issue. Many modern NIC's used these days can automatically do crossover and often don't need such a cable, but that depends on your NIC.
If you are direct connecting you have to use a crossover cable ( one end 568A and the other 568B)  buy one or make one.
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Commented:
Thank you so much for your fast reply. I forgot the issue. I am going to test it. Can we see if one NIC is able to be used for both straight and crossover by checking its property ?
Senior Software Developer
Commented:
NICs don't have crossover capability. You need either a switch or a crossover cable.
Most Valuable Expert 2015
Commented:
Many new NIC's do have that property, but you have to check on it's homepage for what it supports.

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