How can I limit Squid's total bandwidth to, say, 512 Kbps?

Acl all src 0.0.0.0/0.0.0.0 # might already be defined delay_class1_access all delay_class1_aggregate_max 64000 # 1 second "buffer" of 64kbytes delay_class1_aggregate_restore 64000i # 512 kbits == 64 kbytes per second The 1 second buffer is because you have implied you just want a limit, and don't want it to be able to respond to a burst. If you want it to be able to respond to a burst, increase the aggregate_max to a larger value, and traffic bursts will be handled. More.

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