Re: Ping, ICMP and TCP Ping

[Nikolai Alexandrov <voyager123bg () gmail com>]

zaka rias wrote:

> hi,
>
>  
hello

> Im learning protocol tcp/ip and icmp, and as far as i
> know that Ping (software) is using ICMP protocol to
> transmit packets and PING is identic with ICMP.
>
>  
Ping program infact is using ICMP, ping and ICMP are two different 
things infact, ping is using particular types icmp packets - 
"echo-request" and "echo-reply"

> I have always wrapped my thinking that ICMP (and Ping
> Program) echo/reply was a port 0 thing (like someone
> said in
> http://forum.sans.org/discus/messages/78/10869.html?1110164175
> ), and that's wrong.
>  
Yep.

> Then i found something called TCP-PING. TCP PING can
> be described as a TCP packet with the ACK flag set,
> destined for port 80 of the target host (Mark
> Wolfgang, Host Discovery With NMAP).
>
>  
True, other methods also exist ;) look hping.org

> i just wonder if this kind of method called TCP-PING,
> when actually TCP-PING isnt using ICMP protocol, and
> once more ->  TCP PING 's using port when actually
> PING program is not using a port to communicate.
>
>  
It is ping indeed, for the general purpose of pinging host is to 
determine whether it is alive. Tcp ping may work where icmp ping may not :)

> i hope you understand my english
>
>
>
> zak
>
>
> Send instant messages to your online friends http://uk.messenger.yahoo.com 
>
>