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6.9

tcp6 in netstat output

Asked by sminfo in Debian Linux

Tags: Debian

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 configured 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)

[+][-]09/18/09 10:18 PM, ID: 25371574Expert Comment

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[+][-]09/18/09 10:22 PM, ID: 25371585Expert Comment

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[+][-]09/19/09 06:01 PM, ID: 25375507Author Comment

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[+][-]09/19/09 06:10 PM, ID: 25375539Author Comment

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[+][-]09/19/09 06:29 PM, ID: 25375584Accepted Solution

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About this solution

Zone: Debian Linux
Tags: Debian
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Solution Provided By: mwecomputers
Participating Experts: 2
Solution Grade: B
 
 
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