nanog mailing list archives
Blocking spoofing at the source (was: ICMP Attacks??)
From: Joe Rhett <jrhett () ISite Net>
Date: Fri, 22 Aug 1997 14:34:07 -0700 (PDT)
Given the predominance of Ascend in the marketplace, and their general configuration style, it would be cool to see an option "AllowIpSpoofing=Yes/No" or the like. The boxes already carry routes associated with each interface. If a packet arrives that doesn't have a route to get it back to the interface it came from, it would be dropped. Sure, this may not always be what you want, but in 99% of the cases it would be. Implementation via Radius would permit this to be removed from people you wish to allow to spoof. :)
This won't work on anything with multiple diverse paths. And I don't know many companies with their own WANs that don't have such. So, yes, the idea is nice but the logic would have to be much more comprehensive than that. And I honestly don't know how you could safely do it, that won't break half the routing topologies out there. (if you assume multipath OSPF for the IGP... maybe. But that's one hell of an assumption.) -- Joe Rhett Systems Engineer JRhett () ISite Net ISite Services PGP keys and contact information: http://www.navigist.com/Staff/JRhett
Current thread:
- Re: ICMP Attacks???????, (continued)
- Re: ICMP Attacks??????? Jon Green (Aug 21)
- Message not available
- Re: ICMP Attacks??????? Jay R. Ashworth (Aug 21)
- Message not available
- Re: ICMP Attacks??????? Jay R. Ashworth (Aug 21)
- Re: ICMP Attacks??????? Jon Green (Aug 21)
- Re: ICMP Attacks??????? Greg A. Woods (Aug 21)
- Re: ICMP Attacks??????? Jon Green (Aug 22)
- Re: ICMP Attacks??????? Greg A. Woods (Aug 22)
- Re: ICMP Attacks??????? Joe Rhett (Aug 22)
- Message not available
- Re: ICMP Attacks??????? Jay R. Ashworth (Aug 22)
- Re: ICMP Attacks??????? Josh Beck (Aug 21)
- Blocking spoofing at the source (was: ICMP Attacks??) Joe Rhett (Aug 22)
- Re: Blocking spoofing at the source (was: ICMP Attacks??) Josh Beck (Aug 22)
- Message not available
- Re: Blocking spoofing at the source (was: ICMP Attacks??) Jay R. Ashworth (Aug 22)
- Re: Blocking spoofing at the source (was: ICMP Attacks??) Robert Sanders (Aug 29)
- Re: Blocking spoofing at the source (was: ICMP Attacks??) Phil Howard (Aug 22)
- Re: Blocking spoofing at the source (was: ICMP Attacks??) Robert Sanders (Aug 29)
- Re: ICMP Attacks??????? Peter E. Giza (Aug 21)
- Re: ICMP Attacks??????? Jon Lewis (Aug 21)
- Re: ICMP Attacks??????? Alex "Mr. Worf" Yuriev (Aug 21)
- Re: ICMP Attacks??????? Jon Lewis (Aug 21)
- Re: ICMP Attacks??????? Edward Henigin (Aug 21)