Port 123 and ipv6

[lina <lina.lastname@gmail.com>]

Hi,

I read something online, and wonder:
1] shall I close the port 123
2] disable ipv6

Shall I follow the advice from https://wiki.debian.org/DebianIPv6 to
turn off the ipv6 in wheezy as in squeeze,

Thanks,

# netstat -nltpu
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address
State       PID/Program name
tcp        0      0 127.0.0.1:631           0.0.0.0:*
LISTEN      3592/cupsd
tcp        0      0 0.0.0.0:1209            0.0.0.0:*
LISTEN      4030/sshd
tcp        0      0 127.0.0.1:25            0.0.0.0:*
LISTEN      3690/exim4
tcp        0      0 127.0.0.1:2628          0.0.0.0:*
LISTEN      3381/1
tcp6       0      0 ::1:631                 :::*
LISTEN      3592/cupsd
tcp6       0      0 :::1209                 :::*
LISTEN      4030/sshd
tcp6       0      0 :::143                  :::*
LISTEN      2850/couriertcpd
udp        0      0 0.0.0.0:68              0.0.0.0:*
        3965/dhclient
udp        0      0 0.0.0.0:68              0.0.0.0:*
        3560/dhclient
udp        0      0 0.0.0.0:68              0.0.0.0:*
        3512/dhclient
udp        0      0 172.21.100.159:123      0.0.0.0:*
        3173/ntpd
udp        0      0 127.0.0.1:123           0.0.0.0:*
        3173/ntpd
udp        0      0 0.0.0.0:123             0.0.0.0:*
        3173/ntpd
udp        0      0 0.0.0.0:58715           0.0.0.0:*
        3965/dhclient
udp        0      0 0.0.0.0:7059            0.0.0.0:*
        3512/dhclient
udp        0      0 0.0.0.0:44141           0.0.0.0:*
        3560/dhclient
udp6       0      0 fe80::ca2a:14ff:fe0:123 :::*
        3173/ntpd
udp6       0      0 ::1:123                 :::*
        3173/ntpd
udp6       0      0 :::123                  :::*
        3173/ntpd
udp6       0      0 :::51241                :::*
        3560/dhclient
udp6       0      0 :::47198                :::*
        3512/dhclient
udp6       0      0 :::36728                :::*
        3965/dhclient