redhat network problems

[Darrell Shandrow]

Hi Brian,

Well, first, since you can ping and nmap shows that some ports are open, we
know we do not have a problem with basic IP networking.  In other words, the
problem is not anywhere on the bottom 4 layers of the OSI reference model.
This helps to isolate your trouble.

I can see two possible reasons why so many ports aren't open.  First,
perhaps you have firewall rules in place?  Red Hat is doing a better job of
implementing very high security by default.  When you installed the OS, did
you select high security?  If so, you might want to go back into the setup
utility and change to medium security.  Don't select "no firewall" unless
you're 100 percent sure that's what you want to do!  Second, perhaps you
have installed your OS with many services simply not running?  You can use
the ps command to determine what processes are running on your system.  For
example, if you wish to be running a web server, the following ps command
should show processes named httpd:
ps -ef |grep httpd
If something isn't running, check out the various run levels in
/etc/rc.d/rcX.d where X represents a run level such as 3 or 5.  In those
directories, you'll see symbolic links to corresponding scripts in
/etc/rc.d/init.d.  Scripts starting with S represent programs being started,
while scripts starting with K represent those being shut down or killed.
The numbers represent the order in which the programs are started at boot
time.  An example is S15httpd and K15httpd found in /etc/rc.d/rc3.d linked
to the corresponding real files with the same name in /etc/rc.d/init.d.

Hope this helps you move in the right direction.

----- Original Message -----
From: "bs" <bpsanders@earthlink.net>
To: <plug-discuss@lists.plug.phoenix.az.us>
Sent: Wednesday, January 29, 2003 8:16 PM
Subject: redhat network problems


> ease excuse this newbie's ignorance but I have RTM and I still can't get
> my two Redhat 7.3 boxes to talk to eachother. I can ping from one to the
> other but everything else is refused. Nmap shows just a few ports open.
>
> Starting nmap V. 2.54BETA31 ( www.insecure.org/nmap/ )
>  Interesting ports on stimpy (192.168.39.1):
> (The 1547 ports scanned but not shown below are in state: closed)
> Port       State       Service
> 111/tcp    open        sunrpc
> 113/tcp    open        auth
> 199/tcp    open        smux
> 678/tcp    open        unknown
> 1024/tcp   open        kdm
> 1026/tcp   open        nterm
> 6000/tcp   open        X11
>
> *pinging localhost shows*
> Starting nmap V. 2.54BETA31 ( www.insecure.org/nmap/ )
>  Interesting ports on localhost.localdomain (127.0.0.1):
> (The 1546 ports scanned but not shown below are in state: closed)
> Port       State       Service
> 111/tcp    open        sunrpc
> 113/tcp    open        auth
> 199/tcp    open        smux
> 678/tcp    open        unknown
> 1024/tcp   open        kdm
> 1025/tcp   open        listen
> 1026/tcp   open        nterm
> 6000/tcp   open        X11
>
> Thanks in advance, Brian Sanders
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> hanks in
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