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client configuration

Redhat Linux Network Interface Configuration (NIC) File Location

Where are NIC (network interface configuration) files located in the Redhat / Fedora / Centos Linux?
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HowTo: Verify My NTP Working Or Not

I've setup an NTP (Network Time Protocol) client and/or server to manage the system clock over a network. But, how do I verify that it is working correctly?
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How To Reuse SSH Connection To Speed Up Remote Login Process

Q. How do I reuse same ssh connection to speed up remote login procedure with OpenSSH client?
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FreeBSD Configure IPv6 Networking / Static IP Address

How do I configure IPv6 networking under FreeBSD 7.x server? How do I assign IPv6 IP address using command line utility?
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Mail delivery: DNS: Service unavailable error

Q. My mail delivery fails with DNS: Service unavailable error. How do I fix this error under Linux / UNIX operating systems?
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