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I have 2 computers on the network (Computer A & B). There are also other computers on the network.
From Computer A I am able to ping all other computers on the network except Computer B. Similarly from Computer B, I am able to ping all computers on the network except Computer A. And I am able to ping Computer A & Computer B from other machines in the network.
It looks like just Computer A & Computer B won't talk to each other for some reason. I have done the following and still have problems:
- Re-installed Operating systems in both Computers. Computer A was upgraded to Windows Server 2012 from Server 2008 R2. Windows Server 2008 R2 was re-installed in Computer B.
- Firewall is turned off in both computers
Does anybody know why this would happen?
Pal R
Posted 2013-04-25T16:01:55.883
Reputation: 111
Switch ?LAN ? Network config ? – Ofiris – 2013-04-25T16:03:48.523
Both are connected to LAN – Pal R – 2013-04-25T16:04:37.707
Whats their subnet configurations ? – Ofiris – 2013-04-25T16:06:03.550
255.255.255.0. Is that what you are asking? – Pal R – 2013-04-25T16:08:12.333
1After attempt to connect, look at ARP on both hosts. arp -a – Mikhail Moskalev – 2013-04-25T16:13:12.337
Yeah, compare to the rest of the computers in the network – Ofiris – 2013-04-25T16:16:06.820
Checked with arp -a. Pinged from Computer A to Computer B, and from Computer C (another Computer on network) to B, and both (A & C) show the same physical address for Computer B and type is dynamic. Also pinged from Computer B to Computer A, and from Computer C (another Computer on network) to A, and both (B & C) show the same physical address for Computer A and type is dynamic. – Pal R – 2013-04-25T16:23:25.860
However, I am able to lookup the IP address of the machines using nslookup. I am just not able to ping. From A to B, I get the message "Request timed out.". From B to A, I get the message "Destination Host Unreachable". – Pal R – 2013-04-25T16:34:23.670
Open cmd and run "ipconfig" and post the local ipv4's listed from machine A and B -> please also post standard gateway – M.Bennett – 2013-04-25T16:49:50.110
Computer A - IPv4: xx.xx.4.30, Default Gateway: xx.xx.4.252. Computer B - IPv4: xx.xx.4.59, Default Gateway: xx.xx.4.252 – Pal R – 2013-04-25T16:54:06.450
you've confirmed that they don't have the same mac address right? do they both use the same subnetmask, and does it end in .0? – Frank Thomas – 2013-04-25T17:01:11.313
Yes, both have the same subnet mask 255.255.255.0 – Pal R – 2013-04-25T17:13:15.370
They have different MAC address – Pal R – 2013-04-25T17:13:46.230
Are you pinging by hostname or IP address? – None – 2013-04-25T17:53:58.380
By IP address from both machines – Pal R – 2013-04-25T17:59:09.110
Maybe another approach: Check the settings of the normal pc's against the settings of computers A and B...i would start with basic network settings and then onto firewall software, settings etc. – M.Bennett – 2013-04-25T19:04:07.157
Ok. I connected Machine B from another location in the network and I am able to ping now...however I don't know why only Machine A was unable to ping Machine B in the previous location... – Pal R – 2013-04-25T19:35:55.187