[167102] in North American Network Operators' Group
Re: Europe-to-US congestion and packet loss on he.net network, and
daemon@ATHENA.MIT.EDU (Daniel Suchy)
Sun Dec 1 06:16:55 2013
Date: Sun, 01 Dec 2013 12:16:20 +0100
From: Daniel Suchy <danny@danysek.cz>
To: nanog@nanog.org
In-Reply-To: <m2pppgc0dc.wl%randy@psg.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On 1.12.2013 11:49, Randy Bush wrote:
>>> Using a 1/10th of a second interval is rather anti-social.
>>> I know we rate-limit ICMP traffic down, and such a
>>> short interval would be detected as attack traffic,
>>> and treated as such.
>> For what it is worth, I used to think the same, until I saw several=20
>> providers themselves suggest that 1000 packets should be sent, with=20
>> the 0.1 s interval. So, this is considered normal and appropriate=20
>> nowadays.
>=20
> matthew is correct
>=20
> go back to your old way of thinking. while some providers may tolerate=
> fast pings, few if any grown-ups do. and even thouse who think they do=
> have routing engines which consider all pings as low priority rubbish t=
o
> be dropped when there is any real work to do.
>=20
=46rom router control-plane perspective, rate-limiting should be always
expected and result evaluation should take that in account. From router
perspective, packet with TTL=3D1 is handled typically in software, in CPU=
with limited power (compared to modern hardware) and it's not a primary
job of router to answer to each TTL=3D1 packet - that's correct view.
But, provided reports shows ALSO end-to-end packet loss, which never
will be caused by control-plane policers on transit routers, these
packets will never hit router CPU.
And there we talk about basic network neutrality - everyone should treat
all data equally, independently of protocol used for data transport.
Daniel
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