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network interface cards

ifconfig Command Does Not Show IPv4 Address

ifconfig command does not show IP address on my Linux based laptop computer. How do I fix this problem?
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Linux: Configuring RX POLLING (NAPI)

My CentOS / RHEL based server is configured with Intel PRO/1000 network interface cards. NAPI (Rx polling mode) is supported in the e1000 driver. I've multiple CPUs. How do I configure NAPI, decreasing interrupts and improve overall server network performance?
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Q. How do I configure CentOS / Redhat Linux computer to share my internet connection? How do I configure RHEL as a software router with two interfaces? How do I share my single connection with other PCs on LAN?
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