Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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.
OK, I have my box behind a NAT firewall router given by my isp. I run sendmail to listen on port 25 for smtp on my pc. I've configured the firewall to foward port 25 to my computer. What I think I'm supposed to do is be able to send email to my LAN's public IP and it will be sent to my PC right? Well, whenever an email sent from outside to my pc it gets a failure delivery email saying "550 relaying denied". I think this is because sendmail thinks it's my internal ip, but the emails go to user@publicip. How do I make this work?
This brings us to the point of why your are setting up a mail serer only to receive mail on an IP. You don't need to be big company to register a domain. Also if you aren't on a fixed IP it will be very difficult to manage as an incomming mail server.
If you hav a dynamic IP address then take a look at a dynamic DNS service like http://www.dyndns.org/ If you have a fixed a address then you should be able to use almost any registrar - just shop about for the best deal.
You should probably make your local IP static too so that you don;t need to keep changing your forwarding rules.
The reason that you need ot use a domain name is so that an MX record can be set up. You can't setup mx records for IP addresses. Using an IP would only work if you were using the mail server as everyones smtp server.