Author Topic: pinging using DNYDNS TOOL  (Read 17919 times)

RADIOWAVES

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pinging using DNYDNS TOOL
« on: 2011-08-14, 19:05:19 »
Could someone please tell me if I should be able to ping all the ports ie audio, sip,cmd, web svr. using the DNYDNS ping tool through my external ip address?

Thanks

Fred

KR3JA

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Re: pinging using DNYDNS TOOL
« Reply #1 on: 2011-08-15, 17:14:41 »
Fred,

You can ping the IP and see if the node is alive, but you can't ping a specific port.  To see if the port is alive, you need a port scanner tool.

Pinging the SIP, CMD and Audio ports requires a UDP port scan utility - you can't "ping" them directly.  Read here for more info - especially the part on UDP scanning: http://en.wikipedia.org/wiki/Port_scanner

Try a tool like NMap which can do TCP and UDP port scanning: http://nmap.org/

73
Jim KR3JA


dj0qn

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Re: pinging using DNYDNS TOOL
« Reply #2 on: 2011-08-16, 09:36:25 »
Jim is correct, but I need to add one thing that has caused some people to get confused:

When you ping your DynDNS address, you land at your router. Often, the result of a ping will
be a timeout. This is because ICMP reply is often turned off by default for security reasons.

If you receive a timeout when you ping your router, you need to turn "ICMP packet reply" or
similar on. This is usually under the firewall or security settings.

73,
Mitch DJ0QN / K7DX

RADIOWAVES

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Re: pinging using DNYDNS TOOL
« Reply #3 on: 2011-08-16, 15:00:02 »
Thanks Mitch and Jim
I understand and Jim I will download Tool and try it.

most helpful

73
Fred W1FC