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How to set a maximum download speed per client IP-address

Limiting outbound network bandwidth per client IP-address

Apr. 1, 2020 -

Last month I received an automated alert indicating excessive bandwidth usage, usually a sign of trouble. When this happens, you should follow a standard incident procedure, trying to isolate the source of the traffic before shutting it down. The cause of this incident was not what I expected however... requiring a different kind of mitigation than a simple blockade.

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Bandwidth graph with unusual spike indicating that something is wrong - you don't need to be Sherlock Holmes to find it
Bandwidth graph with unusual spike indicating that something is wrong - you don't need to be Sherlock Holmes to find it
Using tokens to control traffic - only passengers (or data packets) with a valid token are allowed. Tokens are returned as traffic reaches its destination.
Using tokens to control traffic - only passengers (or data packets) with a valid token are allowed. Tokens are returned as traffic reaches its destination.
Bandwidth graph of AMS-IX shows a predictable pattern - notice the wave-like pattern
Bandwidth graph of AMS-IX shows a predictable pattern - notice the wave-like pattern
Using the iftop tool to see bandwidth usage per connected IP-address
Using the iftop tool to see bandwidth usage per connected IP-address
Bugs in Microsoft Outlook cause it to keep synchronising IMAP folders, a problem experienced by many people (see the number of views!)
Bugs in Microsoft Outlook cause it to keep synchronising IMAP folders, a problem experienced by many people (see the number of views!)
Traffic must wait for tokens to become available when the maximum number of tokens is given away, enforcing the maximum concurrent traffic
Traffic must wait for tokens to become available when the maximum number of tokens is given away, enforcing the maximum concurrent traffic

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