Networking in Linux: a brief overview

TCP/IP  TCP/IP concepts we have seen are applicable to Linux (a version of UNIX, where TCP/IP started)  Some special IP addresses  localhost (loopback address)  Internal networks  Class A  Class B to  Class C to  Machines behind a firewall can use these internal IP numbers to communicate among them.  Only the firewall machine/device (host) needs to have an IP address valid in the Internet.

Basic configuration files  You can manually create, change and view the basic configuration files: /etc/hostname /etc/hosts /etc/resolv.conf /etc/interfaces  See this example for their format. Also a howto.example howto  Of course you can also do it in an Ubuntu GUI at System, Administration, Network. defining the interface type (static, IP, subnetmask and gateway) or DHCP.staticDHCP setting the DNS server.DNS

Servers and daemons  Setting up telnet and ftp servers is not recommended, use ssh (default in Linux).telnetftpssh  Setting up a Web server (Apache)Web server  Setting up and configuring SAMBA Setting up configuring  Setting up a firewallfirewall  NIS and NFS NISNFS  DHCP DHCP  DNS (bind) DNS  Xinetd - the super daemon Xinetd  Ubuntu documentation. Ubuntu documentation A free network admin manualnetwork admin