How to limit ftp speed
The keyword is bandwidth management and the Linux Kernel has direct support of it. I dealed with this long time ago and have forgotten much about that but there is a great online book that covers the topic extensively. It's called
- Linux Advanced Routing & Traffic Control.
To get a foretaste of what you want to achieve take a look at
- Chapter 9. Queueing Disciplines for Bandwidth Management.
Perhaps there are (software) servers which support bandwidth control directly!?
Supplement:
In the pureftpd FAQ it is explained how to enable bandwidth limitation on the system level. On the first sight it seems to be applicable to other ftp servers as well.
There is another freely available book called
How to Accelerate Your Internet: A Practical Guide to Bandwidth Management and Optimisation Using Open Source Software
that deals with the topic. At first glance it seems to worth a look.
I found a way to limit ftp speed:
In the /etc/proftpd.conf insert this line:
TransferRate RETR,STOR,APPE,STOU 2000
This will limit ftp speed to 2 megabyte per second.
After changing the file you should restart the proftpd service:
/etc/init.d/proftpd restart