Woundy, Richard wrote: >> The network maps (and the associated cost map) is fine as long as >> the IP prefix allocation in an ISP's network is stable. Where >> stable means changes of the IP prefix allocation are happening in >> the range of weeks. > > In the networks I am familiar with (cable), most of the time the IP > address is fairly stable, with DHCP lease times on the order of > several days or a week. And the same lease is often renewed to the > same DHCP client (even on a modem reboot), so a DHCP client could > maintain the same IP address for months at a time. So most of the > time, most of the information in a network map will be fairly stable. > > > (On non-cable networks, your mileage may vary.)
On a non-cable network I'm somewhat familiar with, we have observed that about 60% of the residential access lines change address in 24h, while the remaining ~40% remains fairly stable for several days (i.e. in 2 days 40% of the lines maintain the same address, in 7 days 38%). This is of course a very particular case, and the numbers are likely to vary whenever address pools got reallocated -- i.e. quite often, in nationwide ISPs. -- Ciao, Enrico
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