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internet protocol ip

HowTo: Speedup ping and traceroute Command Responses under Linux / Unix

The following question was asked in the Unix networking exam:

How do you speed up ping and traceroute command responses under Unix or Linux operating systems?

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CentOS / RHEL: Remove Routes / From the System

How do I disable the route / from CentOS or RHEL 6 Linux server?
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Understanding CentOS Default -A RH-Firewall-1-INPUT -p 50 -j ACCEPT Firewall Rule

Q.Can you explain the meaning of following two firewall rules present in my /etc/sysconfig/iptables rules under CentOS Enterprise Linux version 5.2?

-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
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