nanog mailing list archives
RE: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms
From: <adamv0025 () netconsultings com>
Date: Tue, 12 Mar 2019 11:47:52 -0000
Töma Gavrichenkov Sent: Friday, March 8, 2019 5:07 PM On Fri, Mar 8, 2019 at 7:48 PM Saku Ytti <saku () ytti fi> wrote:Why do you think it would be expensive? It's cheaper than how ECMP is done for L3 keys, because you just read the flow label and not calculate any hash.The most honest answer would be: I have no idea. That's just what I've seen, rather briefly though, as we weren't going to investigate that part at the time. It's been a while since then, and maybe there was a mistake on our side (at least within a perfectly academic context I must assume that there was, as there was no peer review — we were not in academy after all!), but I'm still inclined to, first, see the benchmarks of any proposed piece of hardware that's promising you ECMP with flow labels, second, make any statements about the latter.
We did this exact testing a while back on Juniper 2nd and 3rd gen PFEs. The results showed it doesn't matter a tiny bit whether you do 5-tuple hash or use flow label. So the bottom line is on modern NPUs it doesn't really matter. adam
Current thread:
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms, (continued)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Saku Ytti (Mar 05)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Joel Jaeggli (Mar 05)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Saku Ytti (Mar 05)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Töma Gavrichenkov (Mar 08)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Saku Ytti (Mar 08)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Tarko Tikan (Mar 08)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Töma Gavrichenkov (Mar 08)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Saku Ytti (Mar 08)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Töma Gavrichenkov (Mar 08)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Saku Ytti (Mar 08)
- RE: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms adamv0025 (Mar 12)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Saku Ytti (Mar 12)
- RE: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms adamv0025 (Mar 12)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Saku Ytti (Mar 12)
- RE: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms adamv0025 (Mar 12)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Saku Ytti (Mar 12)
- RE: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms adamv0025 (Mar 13)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Masataka Ohta (Mar 09)
- Re: ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms Jean-Daniel Pauget (Mar 08)