Am 25.12.2010 11:57, schrieb Ondrej Zajicek: > On Sat, Dec 25, 2010 at 05:03:46AM +0200, Alexander Shikoff wrote: > >> I've googled around this problem and have not find yet another >> ideas/discussions etc. So your way seems to be most easy and effective >> at present moment. > > Another, even simpler, way is to assign each connected client with > 32bit ASN some pseudo-ASN from private range. This pseudo-ASN > would be used with standard communities (0:X, MyASN:X). >
unfortunately there is no one-to-one and onto mapping between 32bit ASN and ASN from private range which makes it impossible to come up with a general solution. Otoh a first come first serve assignment at each IXP will for sure lead to different mappings 32bit ASN <-> private ASN which makes it really cumbersome for ISP's connected to more than one IXP. A better approach might be to use extended communities. However iirc the problem there is that you only have 48 bits left. You could work around that by splitting the range in 24bit/24bit which would of course be sufficient for nowadays ASN in use, but make it cumbersome to calculate the values to set. Best regards and happy holidays, Arnold -- Arnold Nipper / nIPper consulting, Sandhausen, Germany email: arn...@nipper.de phone: +49 6224 9259 299 mobile: +49 152 53717690 fax: +49 6224 9259 333