Tag Archives: math

IPv6 Subnetting – You and your customer

There’s this great debate in the IPv6 world about how to chop up your allocation into assignments for your customers. Typically, most ISPs are being handed a /32, and general guidelines say to allow for a /48 per DSL/leased line/cable customer. However a lot of people are asking, why not a /64?  Quoted below is [...]

Just how dumb are BT Wholesale?

They tried to requote us for their 21CN broadband platform, assuming we take it in London as they wanted to charge us 50p per meter all the way from Manchester to Belfast (totaling some £250k). After carefully examining our current installation they decided that we should replace our pair of 34Mb pipes with a single [...]

IPv6 Subnet Size Reference Table

More numbers than you can shake a stick at. Just to give you an idea, at the ISP level (/32) that’s 79 septillion IP addresses assigned. That number is so big I had to go look it up on Wikipedia to find out what it’s called. Every home user will have 18 quntillion addresses at [...]

Measuring bandwidth

An issue that comes up for me at work time and time again is customers misunderstanding how bandwidth is measured.