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Web app developers spend most of our time not thinking about how data is actually transmitted through the bowels of the network stack. Abstractions at the application layer let us pretend that networks read and write whole messages as smooth streams of bytes. Generally this is a good thing. But knowing what's going underneath is crucial to performance tuning and application design. The character of our users' internet connections is changing and some of the rules of thumb we rely on may need to be revised.
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Unlimited calls and bandwidth for $69.95/mo. on a smart phone. No contract. Pay month-to-month.
throttled is a bandwidth shaping application for Mac OS X and FreeBSD which allows you to cap your upstream bandwidth, prioritize ACK packets, and keep your download speeds high even when your server is sending out at full speed.
Performance just got a little bit easier. Optimizing images by hand is time consuming and painful. Smush it does it for you.
I wrote the program "throttle.c," which you can insert into the tcpserver chain of commands for a qmail smtpd server. It takes one argument: the number of kilobytes per second to let through on the incoming file descriptor. Throttle does not throttle the outgoing file descriptor, because that's usually just status from your mail server. Additionally, throttle will set an alarm, so that any session longer than 15 minutes will expire and disconnect. This affords some amount of protection against lingering sessions that eat up your parallelism limit; I've seen such sessions from presumably trojaned DSL machines connecting to the mail server to send spam.
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Active Wall Traffic Monitor is a free real time network traffic monitor software for LAN. It has great performance, can monitor more than 1,000 computers at the same time. And it is stable and secure for 24X7 running. It displays IP address, MAC address, computer name, send/receive speed, send/receive packets, send/receive bytes of each computer in real time. It provides tcp/udp/icmp/igmp packets, tcp/udp/icmp/igmp bytes traffic statistics and show net flow in real time. It can export daily traffic statistics of each computer automatically. All these functions are free. Active Wall Traffic Monitor includes Show Flux plugin.
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The Apache module mod_bwshare throttles HTTP requests to Apache 1 and 2 servers for each client IP address independently. The mod_bwshare module accepts or rejects HTTP requests from each client IP address based on past downloads by that client IP address. If the HTTP client's download rate exceeds specified levels, the reponse to the HTTP client is an HTML warning message. A human browser will see a warning message indicating how long to wait. Automatic rampant downloaders will download large numbers of useless warning messages. The original motivation for mod_bwshare was to prevent automatic download of all 900 MBytes of material on one of my web sites which was connected to a 33k modem, which would have taken several days if it had succeeded.
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