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This article will explain in detail how linux monitors non-local addresses. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

The newer version of the linux stack provides the ability to bind non-local addresses, and the use of bind can be more flexible. This feature is turned off by default. If you need to open it, modify the proc sys file:

# echo 1 > / proc/sys/net/ipv4/ip_nonlocal_bind

Implementation code corresponding to the kernel:

Inet_bind ()... If (! net- > ipv4.sysctl_ip_nonlocal_bind & &! (inet- > freebind | | inet- > transparent) & & addr- > sin_addr.s_addr! = htonl (INADDR_ANY) & & chk_addr_ret! = RTN_LOCAL & & chk_addr_ret! = RTN_MULTICAST & & chk_addr_ret! = RTN_BROADCAST) goto out

With a little note, this feature is not just for tcp.

This is the end of the article on "how linux monitors non-local addresses". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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