11 Oct 08 Linux on a Mikrotik 532a, Part 4 – Customization, Debian Scripts, Shaping, Firewall, NAT, picoLCD

Follow On From: 05 Oct 08 APNIC Box – Linux on a Mikrotik 532a, Part 3 – Installing Debian, Prebuilt Disk Image

Following on from the previous article, I’ve written some scripts which you’ll find in the /root/scripts/ directory of the prebuilt image. I’ve attached and commented them here, as they could also be useful elsewhere.

bridge.sh #For setting up a simple bridge
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Tags: 532a, APNIC Box, bandwidth management, bandwidth rate, bridge, cbq, ifconfig, iproute2, iptables, lcd, Linux, picolcd, qdisc, routerboard, routerboard 532a, shaping, tc, time, usblcd, usleep

17 Sep 08 95th percentile billing explaination

95th percentile billing commonly misspelled as “percential” is a method used by some NOCs to change for bandwidth.

The system is simple and essentially discards the top 5% of your traffic peaks, and then uses the next value down as your bandwidth rate. 5% of a month is 36 hours. This might sound like a bit of a scam, because you’re being billed for bandwidth consumption that you may not have used, but it’s not difficult to get it to work for you.

If you’re hosting a site where a lot of content is downloaded, it may be better to go for bandwidth billing. A client’s content server uses about 8,000GB transfer per month and shows a 95th percentile of 34mbit/sec. It’s certainly cheaper to pay for 8,000GB transfer over 30+mbit/sec dedicated.
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Tags: 95th, 95th percential, 95th percentile, bandwidth consumption, bandwidth management, bandwidth rate, burst, content, datacenter, download, Hosting, limiting, noc, peak, peaks, servers, shaping, traffic, traffic peaks

02 Jul 08 Bandwidth Limiting HOWTO with linux, tc and iproute2

I’ve recently optimized the scripts used for bandwidth management in one of our UK facilities and I thought I’d post a quick howto on it.

Discuss this page here

My setup here is a live feed entering eth0 on this linux router and leaving eth1 into a switch connected to a collection of other servers. This is set up as an unrestricted public router, routing between a /30 on eth0 and a /24 on eth1.
Note: We can’t in any way restrict the amount of traffic that eth0 receives from the outside, so instead we restrict how fast eth0 sends data out, the same applies the other way round. So, if we want to limit the amount of data that the local servers can send, we shape the router’s external interface (eth0). If we want to limit the amount of data that the local servers can receive, we shape the router’s internal interface (eth1)
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Tags: 100mbit, 10mbit, 95th percential, 95th percentile, Add new tag, apt-get, bandwidth management, bmon, bulk, classes, datacenter, debian, external interface, htb, interactive, internal interface, iproute2, Linux, percentile, priority, qdisc, restrict traffic, router, routing, switch, tc, traffic shaping