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Problems with iptables on Debian 8 and question about ports.


greenace92

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I'm working on securing my Debian 8 server and I have the option of setting up the iptables or firewall as implemented by my server provider. I intend to do  both but I am wondering if that is redundant to do both.

 

At any rate, I was following along this blog here:

 

bencane.com/2012/09/iptables-linux-firewall-rules-for-a-basic-web-server/

 

For iptables rules.

 

At first I udpate my server, then I install iptables-persistent, although I later realized I should install it after having modified iptables which I have determined comes as a loadable-kernel module mentioned in this thread's answer, number 2

 

http://superuser.com/questions/813323/iptables-module-ip-tables-not-found-for-root

 

Anyway, I can't do this command to save

 

#/etc/init.d/iptables-persistent save

 

For one, the iptables-persistent folder is located in /usr/share/doc/

 

I don't think that it is supposed to be a folder rather a script file

 

Inside the /usr/share/doc/iptables-persistent folder is changelog.gz

 

I'm not sure what is going on.

 

I save the rules by doing dpkg-configure iptables-persistent

 

Verifying by cat /etc/iptables/rules.v4

 

I see that the rules are there, I have just rebooted to see if the changes are actually saved/implemented at boot.

 

If someone can shed some light on this subject.

 

Regarding the ports

 

I think that there are a lot right? I mean I saw one port with a beginning number of 3000. If someone could just do a brief rundown on ports/ which ones are of concern.

 

So far I have 20,21 as FTP, 22 SSH, 80 443 webserver, then there was talk of the port mysql uses 3036?

Then there was mention of anything above 1024 being not for root users...

 

I'm not sure kind of overwhelmed which ports to use and which ones to block.

 

Thanks for any help.

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