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I have 2 computers in my network ones ip address is 192.168.2.31(PC-A) and the others is 192.168.2.33(PC-B). When I'm trying to ping from PC-B to PC-A it says:

Pinging 192.168.2.33 with 32 bytes of data:

Reply from 192.168.2.31: Destination host unreachable.

Reply from 192.168.2.31: Destination host unreachable.

Reply from 192.168.2.31: Destination host unreachable.

Reply from 192.168.2.31: Destination host unreachable.

Ping statistics for 192.168.2.33:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)

And when i'm trying the otherwise it tells me same message with ip address switched..They are both can connect to the Internet

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What's the subnet mask & default gateway on each machine? –  SLaks Dec 17 '12 at 17:25
    
They both have same subnet mask(255.255.255.0) and default gateway(192.168.2.1). –  Roberto Sadfasdf Dec 17 '12 at 17:35
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Please ping the router from both machines and confirm that it is successful. Can you ping the other way (from A to B) –  Dave Rook Dec 18 '12 at 11:51
    
You can check ARP table if the other host is in the network. arp -a will show you MAC addresses and associated IP addresses from the same subnet alongside your router IP and MAC. –  mnmnc Dec 18 '12 at 12:08
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Downvote because there is no question in your question. What exactly do you want to know? –  Werner Henze Aug 7 '13 at 11:35
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migrated from stackoverflow.com Dec 18 '12 at 11:50

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3 Answers

You need to enable the firewall to allow that on your operating system. Depending on your setting the ping is blocked on the PC firewall. See this for instructions how to fix it.

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Hell no! Destination unreachable does not equal to Request time out. ICMP is not blocked by the destination host as it never hits it. Look at the IP address that sent 'Destination unreachable' status. It is not the destination IP -> this is not firewall issue. It could be on the originating host but i really doubt that, and it would involve outbound rules not inbound as you are suggesting. –  mnmnc Dec 18 '12 at 12:12
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Reconfigure your router and make some settings like this

LAN DHCP=Enable

Wireless Authentication type=WPA-PSK/WPA2-PSK

Encryption=AES

After this setting delete all Wireless network of router listed in your PC. And than connect, It will works. you can ping your both PC together.

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He didn't say he was using wireless. –  RJFalconer Mar 30 at 19:59
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See if ECHO request are enabled ... in Windows pc go to Windows Firewall -> Advanced (check the local are connection) -> Settings - ICMP tab and check allow incoming echo request and in Windows firewall -> Advanced in ICMP go Settings and check Allow incoming echo request ... if its linux try to enable the echo request ... no time to write this how ...ill be back in a moment and edit if you are using linux ...

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