[CentOS] Tracking Open Ports

Les Mikesell
Fri, 30 May 2014 15:59:49 -0000

On Fri, May 30, 2014 at 10:14 AM, Eric Falbe <ericf706 at gmail.com>
wrote:
> Hi All,
>
> I was wondering if anyone knew of a way to notify or log when a specific
remote port is openened?  I have an old LDAP server that I am looking to get rid
of, but there is still a few queries reaching it.
>
> The sytem authentication is setup correctly (as is Postfix), so I am
thinking there must be some script or program that is setup to query the older
LDAP server.
>
> I tried using lsof -i|grep 389, but I am not quick enough to get results
before the socket is closed.  Is there any program or script I could write to
detect when this socket gets opened, and what PID and/or program owns it?
>

I'd run tcpdump or wireshark with a 'port 389' filter on the old
ldap
server to capture the source IPs of the queries if you don't know the
host(s) doing it.   And if you know the host(s) but not the program(s)
configured to do it, you might try a 'grep -R 'pattern' /etc
where the pattern is the name or ip of the ldap server.

--
   Les Mikesell
    lesmikesell at gmail.com