nanog mailing list archives
Re: UUNet Offer New Protection Against DDoS
From: Patrick W.Gilmore <patrick () ianai net>
Date: Wed, 3 Mar 2004 17:14:30 -0500
On Mar 3, 2004, at 4:47 PM, Stephen J. Wilcox wrote:
I'm puzzled by one aspect on the implementation.. how to build your customer prefix filters.. that is, we have prefix-lists for prefix and length. Therefore at present we can only accept a tagged route for a whole block.. not good if theannouncement is a /16 etc !
MCI handles this by only filtering on prefix, not length. Well, allowing you to only announce up to your length, not shorter, but longer is allowed.
Now, I could do as per the website at secsup.org which means we have a route-map entry to match the community before the filtering .. but that would allow thecustomer to null route any ip. What we need is one to allow them to announce any route including more specifics of the prefix list - how are folks doing this?
It's not hard. I think the old UUNET just used standard ACLs (1->99). :) But with prefix filters, you can set gt & lt prefix lengths on the filters trivially.
Of course, your customers can then deaggregate to their hearts content. If they do, you should hunt them down and LART them. But it is useful for some things, especially when combined with no_export, the black-hole communities, or other communities.
-- TTFN, patrick
Current thread:
- Re: UUNet Offer New Protection Against DDoS, (continued)
- Re: UUNet Offer New Protection Against DDoS Andy Ellifson (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Stephen Perciballi (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Danny McPherson (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Rob Thomas (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Stephen Perciballi (Mar 03)
- RE: UUNet Offer New Protection Against DDoS Douglas.Dever (Mar 03)
- RE: UUNet Offer New Protection Against DDoS Terranson, Alif (Mar 03)
- RE: UUNet Offer New Protection Against DDoS Lumenello, Jason (Mar 03)
- Re: UUNet Offer New Protection Against DDoS james (Mar 03)
- RE: UUNet Offer New Protection Against DDoS Michael Hallgren (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Stephen J. Wilcox (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Patrick W . Gilmore (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Stephen J. Wilcox (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Patrick W . Gilmore (Mar 03)
- Re: UUNet Offer New Protection Against DDoS David Barak (Mar 03)
- Re: UUNet Offer New Protection Against DDoS James (Mar 04)
- Re: UUNet Offer New Protection Against DDoS james (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Andy Ellifson (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Mark Kasten (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Deepak Jain (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Randy Bush (Mar 03)
- Message not available
- Re: UUNet Offer New Protection Against DDoS Suresh Ramasubramanian (Mar 03)
- Re: UUNet Offer New Protection Against DDoS Paul (Mar 03)