nanog mailing list archives
Re: blocking unallocated subnets
From: Rob Thomas <robt () cymru com>
Date: Fri, 2 Dec 2005 14:04:38 -0600 (CST)
Hi, John. ] I work for a large email provider and we've run into trouble ] delivering mail to certain sites after bringing up new servers in a ] recently allocated subnet of 72/8. Apparently, some folks decided it ] would be a good policy to protect their nameservers from ddos attacks ] to silently drop requests from unallocated subnets. So they obtained ] a list of subnets at some point in the past, deployed it and then ] never updated it. This is why we recommend to those who filter unallocated and bogon space to keep current with lists such as the sundry formats found here: <http://www.cymru.com/Bogons/> Another option is to automate the updates and leave the hard work to us! :) Consider peering with the Bogon route-servers, located throughout the globe thanks to the kind donation of hosting from several folks. <http://www.cymru.com/BGP/bogon-rs.html> Thanks, Rob. -- Rob Thomas Team Cymru http://www.cymru.com/ ASSERT(coffee != empty);
Current thread:
- blocking unallocated subnets John S. Bucy (Dec 02)
- Re: blocking unallocated subnets Jon Lewis (Dec 02)
- Re: blocking unallocated subnets Rob Thomas (Dec 02)
- Re: blocking unallocated subnets Randy Bush (Dec 02)
- Re: blocking unallocated subnets Rob Thomas (Dec 02)
- Re: blocking unallocated subnets Noel (Dec 02)
- Message not available
- Re: [NANOG] blocking unallocated subnets Randy Bush (Dec 03)
- Re: blocking unallocated subnets Randy Bush (Dec 02)