Web Reference: Oct 7, 1999 · It can be used to obtain information about the system and to change certain kernel parameters at runtime (sysctl). First, we’ll take a look at the read-only parts of /proc. In Chapter 2, we show you how you can use /proc/sys to change settings. Network namespaces provide isolation of the system resources associated with networking: network devices, IPv4 and IPv6 protocol stacks, IP routing tables, firewall rules, the /proc/net directory (which is a symbolic link to /proc/ pid /net), the /sys/class/net directory, various files under /proc/sys/net, port numbers (sockets), and so on. By altering the files within these directories, system administrators are able to adjust the network configuration on a running system. Given the wide variety of possible networking options available with Linux, only the most common /proc/sys/net/ directories are discussed.
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