Re: porta 57

     	Io non ne ho mai incontrato uno (lo dico solo perche` sono al
    	5o corso cisco e sto per fare il CCNP).
    	Le macchine che ho visto finora accettano felicemente tcp/23.
    	Solitamente poi hanno una porta tcp tramite la quale si accede
    	alla porta AUX via rete (tcp/2001 per i 2500, 2061 per i
    	[2-3]600, etc).
    
    	Se qualcuno ne sa di piu`, parli ora o taccia per sempre. :)

effettuando un'approfondita ricerca su www.deja.com con le keyword "any
private terminal access cisco", alla terza posizione ho trovato questo:

	-----------
	>Does anyone know what the "mtp" service is on port 57?
	>what is it used for? Where can I get more info on this
	>service?
	>

	On a cisco,this is a port that's listened to when 
	"ip tcp async-mobility server" is configured. This is a
	tcp stream mode connection to cisco VTY's, used in conjunction
	with cisco access servers to implement "async roaming."

	It is off by default in more recent releases of IOS.

	For what its worth, TCP/UDP port numbers are described in:

 	ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers

                 57/tcp    any private terminal access
                 57/udp    any private terminal access

	Paul Ferguson 
	Consulting Engineering  
	Herndon, Virginia   USA  
	tel: +1.703.397.5938
	mailto:ferguson@cisco.com
	------------

e alla quarta questo 

	------------
	> What is port 57 and why does my router allow me to telnet into 	> it?

	According to IANA assignments list:
	57/tcp any private terminal access
	57/udp any private terminal access

	This is Cisco port for vtys.
	In order to protect it, you are going to need some access lists 	for
that particular port.
	------------

e continuando sempre con lo stesso thread, un'altra risposta 

	------------
	This is a tcp stream mode connection to cisco VTYs, used in
	conjunction with the "tunnel" command on cisco access servers to
	implement "async roaming."

	It's OFF by default in more recent versions of the code - too 	many
panicy security people...

	BillW
	cisco
	------------

ciao

luca


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