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Linux: Check Network Connection Command

How do I check network connections under Linux using command line options?
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ping command: TTL Expired In Transit Error and Solution

When I try to ping other UNIX / Linux / BSD or MS-Windows servers in our network I get the following message:

TTL Expired In Transit

How do I fix this problem?
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CentOS / Redhat Linux: Install OpenNTPD To Synchronize The Local Clock

OpenNTPD is a Unix system daemon implementing the Network Time Protocol to synchronize the local clock of a computer system with remote NTP servers. How do I install OpenNTPD under CentOS / RHEL / Fedora Linux instead of default NTPD client / server?
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HowTo: Update Centos Linux 5.4 to 5.5

CentOS Linux v5.5 has been released. How do I upgrade CentOS Linux from version 5.4 to latest version 5.5 over the Internet?
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HowTo: Upgrade Red Hat Enterprise Linux to v5.5

How do I upgrade to Redhat Enterprise Linux server to v.5.5 from 5.4 or earlier version?
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How To: Upgrade CentOS Linux 5.3 to v5.4

How do I upgrade CentOS Linux from version 5.3 to latest version 5.4 over the Internet?
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Mac OS X: Restart / Stop / Start Apache2

How do I restart Apache 2 web server under Apple Mac OS X UNIX operating systems?
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Solaris UNIX: Show Network Routing Table Information

How do I show networking routing table information under Solaris UNIX operating systems using a shell prompt?
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OpenBSD Set / Change Default Gateway

Q. How do I change or set a default gateway under OpenBSD operating system?
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