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Old 11-01-2004, 06:38 PM   #1
Registered: Sep 2003
Distribution: LFS6.1, FC3, RH9
Posts: 36

Rep: Reputation: 15
All ports blocked, but iptables not installed

I have done an absolute minimal install of redhat 9. Iptables and ipchains are not installed. And yet there are no open ports on this machine. I can ping other machines on the network from this machine, but I can not ping this machine from the other machines on the network. Running netstat -vat returns an empty list.

What is it that is blocking ports, or what package might be missing that would enable the ports?

Old 11-01-2004, 07:33 PM   #2
Registered: Jun 2003
Location: Glendale AZ
Distribution: Slackware 10
Posts: 153

Rep: Reputation: 30

just cause you can't ping it doesn't mean the ports are blocked.

Try doing..

"nmap localhost" and see what shows up.

paste your results.
Paste the results of your netstat -A too.
Old 11-02-2004, 11:20 AM   #3
Registered: Sep 2003
Distribution: LFS6.1, FC3, RH9
Posts: 36

Original Poster
Rep: Reputation: 15
#nmap localhost
All 1601 scanned ports on ( are: closed

#netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
unix 3 [ ] DGRAM 885 /dev/log
unix 2 [ ] DGRAM 893

As I mentioned, this was a really bare bones install of Redhat 9, no extra packages were installed.
It seems like the base install is missing some piece that enables the ports to the outside world.

- Joe
Old 11-02-2004, 04:47 PM   #4
Registered: Sep 2003
Distribution: LFS6.1, FC3, RH9
Posts: 36

Original Poster
Rep: Reputation: 15
I still don't understand why all the ports were closed, although I did discover why I was having network problems: I had assigned an IP to this machine that was specifically excluded from the DMZ by the firewall. As this machine was in the DMZ, this was causing my communication breakdown. Newbie booby.


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