Common Ports

amit

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amit

19 Oct 2011 • 1 min read

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Using remote mail server with postfix.

Setting up Postfix to use a remote mailserver Edit /etc/postfix/main.cf and add the following Set this to your email provider’s smtp server. relayhost = yourisp.smtp.servername:25 #or your smtp port if different smtpd_sasl_auth_enable = yes smtpd_sasl_

amit

amit 19 Oct 2011 • 1 min read

Iptables tutorial and examples

Delete existing rules: iptables -F or iptables --flush Set Default Chain Policies: iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP Block an IP Address: iptables -A INPUT -s a.b.c.d -j DROP iptables -A input -i eth0 -p

amit

amit 19 Oct 2011 • 2 min read

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