valamiert az ipv4 25 portok zarva vannak meg google-on is, csak ipv6 on tudom kinytni telnet-el a ipv6-on

[patrikx3]

valamiert az ipv4 25 portok zarva vannak meg google-on is, csak ipv6 on tudom kinytni telnet-el a ipv6-on, masnak is volt ilyen?

 

patrikx3@demona:~$ sudo  -i
Please touch the device.
root@demona:~# telnet -6 corifeus.eu 25
Trying 2a01:4f8:200:4491::2...
Connected to corifeus.eu.
Escape character is '^]'.
220 corifeus.com ESMTP
quit
221 2.0.0 Bye
Connection closed by foreign host.
root@demona:~# telnet -4 corifeus.eu 25
Trying 144.76.168.177...
^C
root@demona:~# telnet -4 corifeus.eu 465
Trying 144.76.168.177...
Connected to corifeus.eu.
Escape character is '^]'.
quit
Connection closed by foreign host.
root@demona:~# telnet -4 corifeus.eu 587
Trying 144.76.168.177...
Connected to corifeus.eu.
Escape character is '^]'.
220 corifeus.com ESMTP
quit
221 2.0.0 Bye
Connection closed by foreign host.
root@demona:~# telnet -4 corifeus.eu 993
Trying 144.76.168.177...
Connected to corifeus.eu.
Escape character is '^]'.
quit
Connection closed by foreign host.
root@demona:~# telnet -6 corifeus.eu 25
Trying 2a01:4f8:200:4491::2...
Connected to corifeus.eu.
Escape character is '^]'.
220 corifeus.com ESMTP
quit
221 2.0.0 Bye
Connection closed by foreign host.
root@demona:~# 
 

[patrikx3]

root@demona:~# telnet -4 smtp.google.com 25
Trying 108.177.15.26...

 

ahogy mutatom, a smtp.google.com ipv4-en sem nyitja a 25 portot, csak ipv6-on