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port mapping and lsof



Hi --

Periodically I get a connection between 2 host on port 1000. netstat,
shown  below, but lsof, when executed like --

/usr/sbin/lsof  -i TCP:1000

-- shows nothing. If i execute --

/usr/sbin/lsof -i -nP

I get nada, see below. Anyone know what or how I can establish what
this connection is? I am running nfs between
the two machines. Much thanks!

-- Gary

#  netstat -nat
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address
     State
tcp        0      0 0.0.0.0:111                 0.0.0.0:*
     LISTEN
tcp        0      0 0.0.0.0:22                  0.0.0.0:*
     LISTEN
tcp        0      0 0.0.0.0:46774               0.0.0.0:*
     LISTEN
tcp        0      0 127.0.0.1:631               0.0.0.0:*
     LISTEN
tcp        0      0 0.0.0.0:25                  0.0.0.0:*
     LISTEN
tcp        0      0 0.0.0.0:34393               0.0.0.0:*
     LISTEN
tcp        0      0 127.0.0.1:6010              0.0.0.0:*
     LISTEN
tcp        0      0 127.0.0.1:6011              0.0.0.0:*
     LISTEN
tcp        0      0 192.168.1.2:1000            192.168.1.1:59903
     ESTABLISHED       ( ### the connection ### )
tcp        0      0 127.0.0.1:25                127.0.0.1:44486
     TIME_WAIT
tcp        0      0 192.168.1.2:991             192.168.1.1:2049
     ESTABLISHED
tcp        0      0 :::22                       :::*
     LISTEN
tcp        0      0 :::25                       :::*
     LISTEN
tcp        0      0 ::1:6010                    :::*
     LISTEN
tcp        0      0 ::1:6011                    :::*
     LISTEN


# /usr/sbin/lsof -i -nP
COMMAND     PID     USER   FD   TYPE DEVICE SIZE NODE NAME
rpcbind    1834      rpc    6u  IPv4   3898       UDP *:111
rpcbind    1834      rpc    7u  IPv4   3902       UDP *:737
rpcbind    1834      rpc    8u  IPv4   3903       TCP *:111 (LISTEN)
rpc.statd  1853  rpcuser    6u  IPv4   3953       UDP *:757
rpc.statd  1853  rpcuser    8u  IPv4   3971       UDP *:40228
rpc.statd  1853  rpcuser    9u  IPv4   3974       TCP *:34393 (LISTEN)
sshd       2182     root    3u  IPv4   4954       TCP *:22 (LISTEN)
sshd       2182     root    4u  IPv6   4956       TCP *:22 (LISTEN)
ntpd       2190      ntp   16u  IPv4   4988       UDP *:123
ntpd       2190      ntp   17u  IPv6   4989       UDP *:123
ntpd       2190      ntp   18u  IPv6   4993       UDP
[fe80::218:f3ff:fef6:3378]:123
ntpd       2190      ntp   19u  IPv6   4994       UDP [::1]:123
ntpd       2190      ntp   20u  IPv6   4995       UDP
[fe80::218:f3ff:fef6:340e]:123
ntpd       2190      ntp   21u  IPv4   4996       UDP 127.0.0.1:123
ntpd       2190      ntp   22u  IPv4   4997       UDP 128.32.10.135:123
ntpd       2190      ntp   23u  IPv4   4998       UDP 192.168.1.2:123
avahi-dae  2243    avahi   14u  IPv4   5213       UDP *:5353
avahi-dae  2243    avahi   15u  IPv4   5214       UDP *:54663
cupsd      2252     root    4u  IPv4   5251       TCP 127.0.0.1:631 (LISTEN)
cupsd      2252     root    6u  IPv4   5254       UDP *:631
master     2428     root   12u  IPv4   5775       TCP *:25 (LISTEN)
master     2428     root   13u  IPv6   5777       TCP *:25 (LISTEN)
....
smtpd     29092  postfix    6u  IPv4   5775       TCP *:25 (LISTEN)
smtpd     29092  postfix    7u  IPv6   5777       TCP *:25 (LISTEN)
smtp      29173  postfix   12u  IPv4 473909       TCP
xxx.xxx.10.135:36858->209.85.217.185:25 (ESTABLISHED)


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