Subnetting legacy Class B networks
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Randy Bush
rbush at bainbridge.verio.net
Tue Dec 15 17:02:23 CET 1998
> It was recently brought to our attention that RIPE have started to break > down some legacy Class B networks and assign individual subnets thereof: > ... > This raises routability problems because many backbone operators filter > out BGP announcements of this range with prefix length longer than /16. > See for example <http://www.sprintlink.net/filter.htm>. for the record, verio also filters B on /16. we do so because that is what the registries told us were allocation boundaries. if registries intend to change these policies, it would be kind to warn and discuss. randy
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