Re: ISP's who where affected by the misconfiguration: start using IRR and checking your BGP updates

I've only dealt with a handful of the bigger networks, but every transit BGP session I've ever been the customer role on has been filtered by the provider. From memory and in no particular order, that's UUNet, Level3, Digex, Intermedia, Global Crossing, Genuity, Sprint, Above.net, Time Warner, C&W, MCI, XO, Broadwing, and a few smaller ones nobody's likely to have heard of.

There's at least one reasonably big transit provider that does *not* do prefix filtering: TeliaSonera (AS 1299). They *do* perform as-path filtering, but the effectiveness is disputable...

As an ISP providing transit, all of our customers get prefix-filtered.

Same here. Steinar Haug, Nethelp consulting, sthaug@nethelp.no