tcpdump command

How do I setup a DHCP server for my local area network (LAN) using Debian Linux 6 or Ubuntu Linux server running on my IBM hardware?

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I‘ve installed keepalived IP failover software as described here. But how do I verify it is working or not?

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I‘m using tcpdump to dump, debug and monitor traffic on a network. However, there is lots of noise and I would like to exclude ssh from my dumps. How do I monitor all traffic except my ssh session?

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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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Q. How do I capture specific protocol or port such as 80 ( http ) using TCPDump tool under Linux / UNIX? How do I recording Traffic with TCPDump and find problems later on?

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Q. How do I filter larger number of subnets and IPs using OpenBSD’s pf firewall under FreeBSD 7.x server? How do I log all dropped packets from such ips? How do I block upto 10000 IPs or subnet without any performance penalty?

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How do I monitor and analyze data transferred via HTTP (apache or lighttpd or nginx webserver) for debugging and security purposes?

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