Download Linux Debugging and Performance Tuning: Tips and Techniques by Steve Best PDF

By Steve Best

A different source that exhibits Linux kernel AND Linux program programmers tips to write bug-free code that's optimized for functionality.

* Debugging ideas for Linux purposes and the kernel
* functionality tuning options for Linux software and the kernel
* pattern courses that express how debugging instruments can locate programming errors
* pattern courses that exhibit how profiling instruments can exhibit which exercises purposes spend the main time in
* Key gains that may be arrange within the kernel to trap facts as soon as an issue happens.

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Additional info for Linux Debugging and Performance Tuning: Tips and Techniques

Example text

The queue is limited on various TCP implementations; therefore a SYN flood can fill it up, causing the machine to reboot or to crash. In Linux, the TCP listen queue differs from one kernel version to another. 0 kernels, there was a backlog keeping track of opened and partially opened TCP connections. The listen queue can be seen and modified using sysctl parameter tcp_max_syn_backlog: root@router:~# cat /proc/sys/net/ipv4/tcp_max_syn_backlog 1024 root@router:~# echo 2048 > /proc/sys/net/ipv4/tcp_max_syn_backlog The first command shows the backlog size of 1024, and the second command sets it to 2048.

19 ] Networking Fundamentals The main protocol found at the Internet layer is IP (Internet Protocol), which provides connectionless, best-effort delivery routing of packets. IP handles logical addressing, and its primary concern is to find the best path between the endpoints, without caring about the contents of the packet. IP does not perform error checking and error correction, and for this reason is called an unreliable protocol. However, these functions are handled by the transport layer (TCP) and/or the application layer.

Physically, a CAM is a normal memory limited in size. In 1999, Ian Vitek created a tool called macof, later integrated in dsniff, which floods switches with invalid source MAC addresses (up to 155,000/minute). This tool quickly fills up the CAM table of the switch to which the computer running the tool is connected, and also the adjacent switches. The result of this attack is an abnormal behavior of the switch by flooding incoming traffic out on all ports (like a simple old Hub), thus making possible a Man-In-the-Middle (MIM) attack—the attacker can start sniffing network traffic.

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