server ip address

Linux Iptables: How to block or open mail server / SMTP protocol

by LinuxTitli on July 22, 2005 · 9 comments

SMTP is used to send mail. Sendmail, Qmail, Postfix, Exim etc all are used on Linux as mail server. Mail server uses the TCP port 25. Following two iptable rule allows incoming SMTP request on port 25 for server IP address 202.54.1.20 (open port 25): iptables -A INPUT -p tcp -s 0/0 –sport 1024:65535 -d [...]

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Linux Iptables Block Outgoing Access To Selected or Specific IP Address / Port

by LinuxTitli on June 26, 2005 · 15 comments

You would like to block outgoing access to particular remote host/ip or port for all or selected service/port. In this quick tutorial I will explain how to use iptables to block outgoing access.

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Solaris UNIX: How to Setup DNS Client configuration / name server

by nixcraft on January 28, 2005 · 11 comments

So how do you set DNS namserver under Sun Solaris UNIX system? The resolver is a set of routines in the C library that provide access to the Internet Domain Name System (DNS). The resolver configuration file contains information that is read by the resolver routines the first time they are invoked by a process. [...]

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