strange ethernet ports in Fedora 7

[NewtownGuy]

Hi,

I've run Fedora Core 2 and 3 in the past, and I just tried Fedora 7. I seem to have a firewall problem, because remote access to one of the custom applications that I run on the Linux machine keeps getting blocked. I've turned off the firewall and SelLinux in Setup but I still can't remotely access my custom server on port 5xxx.

Is it possible that the firewall is still blocking my remote access ? If so, how do I turn it off ? Or, how do I tell it to allow remote access to my application to pass ?

How do I find a list of all ports that are already in use by Fedora 7 in case I'm trying to use a port that's already used ? It wasn't a problem on Fedora Core 2 or 3.

I see strange ethernet ports when I run ifconfig that I've never seen before. Do they have anything to do with the problem ? I see eth0 (as before, has some traffic), lo (as before), peth0 (new to me, has an amount of traffic similar to eth0), and virbr0 (new to me).

During booting, I see that ipv6 is tunneled over ipv4. I don't need ipv6. How do I turn it off ? Could it be a part of the problem ?

I can access SSH and HTTP servers on the Linux machine fine, even with custom port numbers for them that I specified in the various configuration files.

Thank you in advance for your help.

-- NewtownGuy

 

[stefanwagner]

How do I find a list of all ports that are already in use by Fedora 7 in case I'm trying to use a port that's already used?

nmap might be used for a portscan:

nmap  -p1-65535  192.168.0.1

replace the IP of course, use
> man nmap
> nmap --help
to find out more about nmap.

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[thedaver]

lsof -Pni
will list the services and the ports that are listening.

nmap (prior post) from ANOTHER machine will reveal ports actually found to be open

iptables -L
will list the firewall rules on your machine

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http://www.dermanagement.com/

 

[macd68]

Last but not least if you have linked to libwrap in your app check your tcpwrapper configuration in /etc/hosts.allow and /etc/hosts.deny.