nanog mailing list archives
Re: uPRF strict more
From: Saku Ytti <saku () ytti fi>
Date: Wed, 29 Sep 2021 09:03:40 +0300
Vast majority of access ports are stubby, with no multihoming or redundancy. And uRPF strict is indeed used often here, but answer very rarely if ever applies for non-stubby port. Having said that, I'm not convinced anyone should use uRPF at all. Because you should already know what IP addresses are possible behind the port, if you do, you can do ACL, and ACL is significantly lower cost in PPS in a typical modern lookup engine. On Wed, 29 Sept 2021 at 04:10, Amir Herzberg <amir.lists () gmail com> wrote:
Randy, great question. I'm teaching that it's very rarely, if ever, used (due to high potential for benign loss); it's always great to be either confirmed or corrected... So if anyone replies just to Randy - pls cc me too (or, Randy, if you could sum up and send to list or me - thanks!) Amir -- Amir Herzberg Comcast professor of Security Innovations, Computer Science and Engineering, University of Connecticut Homepage: https://sites.google.com/site/amirherzberg/home `Applied Introduction to Cryptography' textbook and lectures: https://sites.google.com/site/amirherzberg/applied-crypto-textbook On Tue, Sep 28, 2021 at 8:50 PM Randy Bush <randy () psg com> wrote:do folk use uPRF strict mode? i always worried about the multi-homed customer sending packets out the other way which loop back to me; see RFC 8704 ยง2.2 do vendors implement the complexity of 8704; and, if so, do operators use it? clue bat please randy
-- ++ytti
Current thread:
- uPRF strict more Randy Bush (Sep 28)
- Re: uPRF strict more Amir Herzberg (Sep 28)
- Re: uPRF strict more Saku Ytti (Sep 28)
- Re: uPRF strict more Nick Hilliard (Sep 29)
- Re: uPRF strict more Mark Tinka (Sep 29)
- RE: uPRF strict more Brian Turnbow via NANOG (Sep 29)
- Re: uPRF strict more Barry Greene (Sep 29)
- Re: uPRF strict more Saku Ytti (Sep 28)
- Re: uPRF strict more Mark Tinka (Sep 29)
- Re: uPRF strict more Amir Herzberg (Sep 28)
- Re: uPRF strict more Blake Hudson (Sep 29)
- Re: uPRF strict more Mark Tinka (Sep 29)
- Re: uPRF strict more Blake Hudson (Sep 29)
- Re: uPRF strict more Sabri Berisha (Sep 29)
- Re: uPRF strict more Blake Hudson (Sep 30)