netstat output:
server:~# netstat -tulp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address
State PID/Program name
tcp 0 0 *:mysql *:*
LISTEN 14399/mysqld
tcp 0 0 server.domain.:www *:* LISTEN
13109/apache2
tcp 0 0 *:ssh *:*
LISTEN 1376/sshd
tcp 0 0 *:afs3-fileserver *:*
LISTEN 14626/haproxy
tcp 0 0 localhost:11000 *:* LISTEN
14537/ruby
tcp 0 0 localhost:11001 *:* LISTEN
14540/ruby
tcp 0 0 *:smtp *:*
LISTEN 2146/master
tcp 0 0 localhost:11002 *:* LISTEN
14543/ruby
tcp 0 0 *:2812 *:*
LISTEN 24723/monit
tcp6 0 0 [::]:ftp [::]:*
LISTEN 26779/proftpd <--tcp6
tcp6 0 0 [::]:ssh [::]:*
LISTEN 1376/sshd <--tcp6
udp 0 0 *:41746 *:*
14626/haproxy
udp 0 0 *:45110 *:*
833/collectd
I have not configure tcp6 in my box but as you can see above proftd
and sshd are listening using proto tcp6. Why?
lsof -i output:
server:~# lsof -i |grep LISTEN
sshd 1376 root 3u IPv6 2946 TCP *:ssh (LISTEN) <--tcp6
sshd 1376 root 4u IPv4 2948 TCP *:ssh (LISTEN)
master 2146 root 12u IPv4 4842 TCP *:smtp (LISTEN)
apache2 13109 root 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 13117 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 13118 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 13119 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 13120 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 13121 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 13122 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 13123 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
mysqld 14399 mysql 14u IPv4 2525508 TCP *:mysql (LISTEN)
mongrel_r 14537 deploy 3u IPv4 2526431 TCP localhost:11000 (LISTEN)
mongrel_r 14540 deploy 3u IPv4 2526438 TCP localhost:11001 (LISTEN)
mongrel_r 14543 deploy 3u IPv4 2526445 TCP localhost:11002 (LISTEN)
haproxy 14626 haproxy 4u IPv4 2526911 TCP
*:afs3-fileserver (LISTEN)
monit 24723 root 4u IPv4 1269944 TCP *:2812 (LISTEN)
proftpd 26779 proftpd 1u IPv6 363248 TCP *:ftp (LISTEN) <--tcp6
apache2 31724 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 31725 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
apache2 31726 www-data 3u IPv4 4049895 TCP
server.domain:www (LISTEN)
--
Regards;
Israel Garcia
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