Fedora 25 changed to end-of-life (EOL) status on 2017-12-12. Fedora 25 is no longer maintained, which means that it will not receive any further security or bug fix updates.
Documentation for /proc/sys/net/ — The Linux Kernel 2. /proc/sys/net/unix - Parameters for Unix domain sockets¶ There is only one file in this directory. unix_dgram_qlen limits the max number of datagrams queued in Unix domain socket’s buffer. It will not take effect unless PF_UNIX flag is specified. Understanding The /proc File System – The Geek Diary /proc/sys/kernel: This directory contains a variety of different configuration files that directly affect the operation of the kernel. /proc/sys/net: This directory contains subdirectories concerning various networking topics. You can alter the files within these directories … Linux Administration: All you need to know about /proc/sys The /proc/sys directory in the /proc virtual filesytem contains a lot of useful and interesting files and directories. Many kernel settings can be manipulated by writing to files in the proc filesystem. A lot of important information can be retrieved from these files. /proc/配下のディレクトリ - MIT
sctp(7): SCTP protocol - Linux man page
/proc/sys/net/ is one of this directories and directory contains subdirectories concerning various networking topics. Various configurations at the time of kernel compilation make different directories available here, such as appletalk, ethernet, ipv4, ipx, and ipv6. The neighbor cache in the Linux kernel isn't as simple as one would think. I'll try to explain some of the quirks with it. There are subtle differences between an neighbor cache entry actually falling out of the cache entirely or just being marked as stale/invalid. These variables can be accessed by the /proc/net/sctp/* files. assocs Displays the following information about the active associations. assoc ptr, sock ptr, socket style, sock state, association state, hash bucket, association id, bytes in transmit queue, bytes in receive queue, user id, inode, local port, remote port, local addresses and remote addresses. It is accessible using the file `/proc/sys/net/ipv4/ip_forward`. The default value is 0 which means no IP Forwarding, because a regular user who runs a single computer without further components is not in need of that, usually. In contrast, for routers, gateways and VPN servers it is quite an essential feature.
Note that, you should use /etc/sysctl.conf for persistent operations on the /proc/sys subdirectories.. In a nutshell, to enable IP forwarding, you can just put the following in /etc/sysctl.conf:
Sysctl tweaks - Sysctl Network tweaks and settings for VMs Mar 25, 2019 Linux increasing or decreasing TCP sockets timeouts - nixCraft