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I am pinging myself and i get replies as normal. But when i ask my friend from another house to ping my ip he doesnt get replies. How is this possible? The modem is on and the ip has not changed. I reset the modem back to its factory settings and still nothing. This started happening 3 days ago when i has a major power supply failure .

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Try a traceroute (tracert in windows) and post the results here. Chances are ICMP is being blocked somewhere along the way. – Bart De Vos Sep 16 '11 at 20:18
tracerooute to which ip? – lorkybinary Sep 16 '11 at 20:33
Your friend should to the trace route to your IP. – Bart De Vos Sep 16 '11 at 22:13
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closed as off topic by ErikA, Bart De Vos, Shane Madden, WesleyDavid, Scott Pack Sep 17 '11 at 0:24

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1 Answer

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Someone is blocking ICMP "ping" (echo request) packets from one side or the other.

You can try to test using a program like "traceroute", which defaults to using UDP packets, but can also be configured by command-line switches to use TCP or ICMP.

Another useful tool might be "nmap". It can probe a lot of ports to see if anything appears to respond.

Another scenario is that one of you is behind a NAT firewall. If one of your addresses is 192.168.x.x or 10.x.x.x or 172.16-31.x.x, then you are on a private network, and your IP address is not publicly exposed.

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