Book Image

Linux Networking Cookbook

By : Agnello Dsouza, Gregory Boyce
5 (1)
Book Image

Linux Networking Cookbook

5 (1)
By: Agnello Dsouza, Gregory Boyce

Overview of this book

Linux can be configured as a networked workstation, a DNS server, a mail server, a firewall, a gateway router, and many other things. These are all part of administration tasks, hence network administration is one of the main tasks of Linux system administration. By knowing how to configure system network interfaces in a reliable and optimal manner, Linux administrators can deploy and configure several network services including file, web, mail, and servers while working in large enterprise environments. Starting with a simple Linux router that passes traffic between two private networks, you will see how to enable NAT on the router in order to allow Internet access from the network, and will also enable DHCP on the network to ease configuration of client systems. You will then move on to configuring your own DNS server on your local network using bind9 and tying it into your DHCP server to allow automatic configuration of local hostnames. You will then future enable your network by setting up IPv6 via tunnel providers. Moving on, we’ll configure Samba to centralize authentication for your network services; we will also configure Linux client to leverage it for authentication, and set up a RADIUS server that uses the directory server for authentication. Toward the end, you will have a network with a number of services running on it, and will implement monitoring in order to detect problems as they occur.
Table of Contents (19 chapters)
Linux Networking Cookbook
About the Author
About the Reviewer

Configuring DNS for XMPP

Much like an e-mail server, there are special DNS records which you can optionally add to your zone file in order to change how the XMPP service operates.

How to do it…

  1. Add the c2s service to DNS:

    _xmpp-client._tcp 28800 IN SRV 20 0 5222
  2. Add the s2s service to DNS:

    _xmpp-server._tcp 28800 IN SRV 20 0 5269

How it works…

Similar to an e-mail, XMPP can use normal A records (or CNAMEs) for a given domain to handle message delivery if the messages are going to be defined to the IP for the root of the domain. In other words, if [email protected] will be hosted on a server which points to directly, then it will work fine.

Also similar to an e-mail, it often makes sense to have the traffic served by a different machine. Rather than MX records which are mail-specific, XMPP uses SRV records, which are a more general approach to looking up a service.

The SRV records are in the format of:

  • Service: The predefined service name that someone...