[arm-allstar] Echolink

[Tony Ross]

You may wish to "man nmap" to understand the meaning of the -Pn switch.

On 5/24/19 2:17 PM, "Charles Powell via ARM-allstar" wrote:
> PING is not a reliable way to see if a server is up or not.  They obviously block all ICMP packets and you will never get a ping response. NMAP does tell you what???s there but be careful.  If they detect you scanning, you could end up with your IP address blocked.
>
> 73,
>
> Charles  NK8O
>
>> On May 24, 2019, at 3:57 PM, Tony Ross via ARM-allstar <arm-allstar at hamvoip.org> wrote:
>>
>> On 5/23/19 2:08 PM, "Boban Jovanovic YT1JB via ARM-allstar" quoted and wrote:
>>> On 23.05.2019. 05:49, "Doug Crompton via ARM-allstar" wrote:
>>>> The various Echolink servers have been up and down for awhile. At the
>>>> moment I can't seem to ping any of them but since I have not tried that in
>>>> awhile it is possible they do not allow pings any more.
>>> Maybe you can test whether he lives by open / close socket on port 5200 B-)
>> # ping -c5 server1.echolink.org; nmap -sS -Pn server1.echolink.org
>> PING server1.echolink.org (174.129.36.165) 56(84) bytes of data.
>>
>> --- server1.echolink.org ping statistics ---
>> 5 packets transmitted, 0 received, 100% packet loss, time 4100ms
>>
>>
>> Starting Nmap 7.40 ( https://nmap.org ) at 2019-05-24 13:55 PDT
>> Nmap scan report for server1.echolink.org (174.129.36.165)
>> Host is up (0.10s latency).
>> rDNS record for 174.129.36.165: ec2-174-129-36-165.compute-1.amazonaws.com
>> Not shown: 998 filtered ports
>> PORT???????? STATE SERVICE
>> 22/tcp???? open?? ssh
>> 5200/tcp open?? targus-getdata
>>
>> Nmap done: 1 IP address (1 host up) scanned in 13.03 seconds
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