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sysctl command

Linux Kernel /etc/sysctl.conf Security Hardening

How do I set advanced security options of the TCP/IP stack and virtual memory to improve security and performance of my system? How do I configure Linux kernel to prevent certain kinds of attacks using /etc/sysctl.conf? How do I set Linux kernel parameters?
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I'm getting an error which read as follows under FreeBSD 7.2 server and Squid stable caching server:

WARNING! Your cache is running out of filedescriptors

How do I fix this problem and increase the number of system-wide available filedescriptors for FreeBSD server?
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Many commands accepts username and passwords on the command line and ps, top, sockstat and many commands can display this information to all users on the system. How do I prevent users from seeing information about processes that are being run under another UID to avoid information leakage under FreeBSD operating systems?
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I've two servers located in two different data center. Both server deals with a lot of concurrent large file transfers. But network performance is very poor for large files and performance degradation take place with a large files. How do I tune TCP under Linux to solve this problem?
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I'm not able to ping from FreeBSD prison (jail). I'm able to resolve the names or use ftp / http for ports but ping and traceroute access is disabled. How do I allow virtualized jail application / users to perform traceroute and ping commands?
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Linux Error: Page Allocation Failure and Solution

Q. How do I get rid of an error message that read as - "Page allocation failure"?
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CentOS / Red Hat Linux IP Forwarding How To

How do I enable IP forwarding under RHEL / Red Hat / Fedora / CentOS Linux operating systems?
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Linux Share a Dial Up Internet Connection

Q. My modem is connected to CentOS Linux server. I'm using wvdial to connect to my ISP; I'd like to connect my laptop via same modem. How do I share a dial up Internet account?
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FreeBSD CPU Information Command

How do I get more information about CPU under FreeBSD operating systems such as CPU Speed and model?
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How do I increase the maximum number of open files under CentOS Linux? How do I open more file descriptors under Linux?
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