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The Book of PF
book

The Book of PF

by Peter N.M. Hansteen
December 2007
Intermediate to advanced
184 pages
4h 45m
English
No Starch Press
Content preview from The Book of PF

That Sad Old FTP Thing

The short list of real-life TCP ports we looked at on Setting Up contained, among other things, FTP, the classic File Transfer Protocol. FTP is a relic of the early Internet, when experiments were the norm and security was not really on the horizon in any modern sense. FTP actually predates TCP/IP,[15] and it is possible to track the protocol's development through more than 50 RFCs. After more than 30 years, FTP is both a sad old thing and a problem child, emphatically so for anyone trying to combine FTP and firewalls. FTP is an old and weird protocol, with a lot to dislike. The most common points against it are these:

  • Passwords are transferred in the clear.

  • The protocol demands the use of at least two TCP connections (control ...

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Publisher Resources

ISBN: 9781593271657Errata