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This article mainly shows you "what to do if the speed of Pure-FTPd is very slow", the content is simple and clear, and I hope it can help you solve your doubts. Let the editor lead you to study and learn this article "what to do when the speed of Pure-FTPd is very slow".

Some users complain that large files cannot be transferred. After the transmission starts, the speed is still normal. Then, there is a sudden drop, the delay is so severe that it often has to be disconnected (or disconnected by the customer after the timeout). The server is behind the firewall that filters incoming ICMP, but allows FTP ports.

Never filter ICMP. At least don't filter blindly without understanding what you're filtering. ICMP is part of the TCP/IP specification.

Filtering ICMP can have a lot of side effects without benefits. If you connect 3 or 4 types of ICMP, there must be something wrong with your firewall. This may be the reason why you always have problems transferring large files.

Please read the documentation on ICMP filtering

Http://www.phildev.net/mss/index.html

Http://alive.znep.com/~marcs/mtu/

Http://www.freelabs.com/~whitis/isp_mistakes.html

Some hardware routers can also cause problems that do not handle window scaling correctly. Try turning it off, for example, on Linux:

Sysctl-w net.ipv4.tcp_window_scaling=0 sysctl-w net.ipv4.tcp_bic=0 above are all the contents of the article "what if Pure-FTPd is very slow?" Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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