Linux - NewbieThis Linux forum is for members that are new to Linux.
Just starting out and have a question?
If it is not in the man pages or the how-to's this is the place!
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
I am going to have squid proxy on my server and am wondering what firewall rules to set up.
The host has a firewall tracking at the entry to their network. However, I can have an extra one on my server.
Is it worth it?
Would I only open up port 80 for the proxy?
At the moment I have this:
1 All Any 22 TCP Allow Active
2 All Any 80 TCP Allow Active
3 All Any 443 TCP Allow Active
4 All Any 8443 TCP Allow Active
5 All 53 Any UDP Allow Active
6 All 123 Any UDP Allow Active
7 All ICMP Allow Active
I have added 2 IPs. One for the proxy server, one for the SSH.
I can't ping the ssh IP. It has no reverse look up, could that be the issue?
I thought for security it was supposed to have no reverse lookup but then how can the ping command find it?
.... and one further IP address, with no reverse lookup set in DNS for SSHd and for SSHd only. And not on port 22 - go for a random port > 1024.
What about FTP? What about it indeed. You don't need it if you have SSH - any half decent FTP client can tunnel in over SSH. It's called secure FTP or SFTP. FileZilla will do it.
My server also has the plesk control panel available on 443 and 8443.
SHould these ports be moved to only be accessible on the 2nd IP address?
So, in effect the shared IP only has the proxy server ports open?
To change the SSH port, does the SSH listening pot have to be changed in linux?