>> Shridhar Daithankar spewed into the ether:
>> >Ping uses ICMP protocol. If you want http ping etc, better use port
>> >scanner like nmap.... But on your own server...... :-))
>> A http ping???????
Well, actually it is called a port ping if you direct TCP packet to a
port like 80 with certain flag like SYN/ACK flag, even though there is no
connection request, the server replies the packet with RST/FIN flag.
The famous nmap uses this to scan the open port in syn attack, which most
server will fail to log, It goes like this,
You send a packet with SYN flag set to a particular port, The server will
respond with SYN/ACK if the port is open, and SYN/RST if the port is closed,
You send RST to tear down the connection (for normal operation ACK is send
and connection is established).
Now if you are interested to play with (on your own risk) ping download
hping www.eaglenet.org/antirez/oldhping.html
Which has all these and much more including a spoofed IP scan, meaning that
one can scan a port on server A from sever B, while sitting at server C, so
dont jump to conclusion if you log files show a scan from www.whitehouse.gov
This is an excellent utility to check fire wall and server security.
>> http works over TCP, which is at a comparable level to ICMP.
>> You can use a TCP connect, or an ICMP request, or a UDP connect.
>> The first and last are done by your browser (or any application which
does FTP/HTTP/Port-Scanning/.....)
>> ping uses the ICMP protocol.
>> So you cannot have a http ping, but you can have a TCP connect (or if you
want to call it that, ping).
>>
>
>
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>
Regards,
Mukund Deshmukh
Beta Computronics Pvt. Ltd.
Web Site - www.betacomp.com
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