On 7/19/18 9:18 AM, Maxim Konovalov wrote:
On Thu, 19 Jul 2018, 08:09-0400, Michael Tuexen wrote:
On 19. Jul 2018, at 03:12, Maxim Konovalov <maxim.konova...@gmail.com> wrote:
Hi Randall,
On Wed, 18 Jul 2018, 22:49-0000, Randall Stewart wrote:
Author: rrs
Date: Wed Jul 18 22:49:53 2018
New Revision: 336465
URL: https://svnweb.freebsd.org/changeset/base/336465
Log:
Bump the ICMP echo limits to match the RFC
[...]
Just wonder, are there any practical reasons to do that?
In case you send encapsulated packets triggering an ICMP message
you actually need more than the 8 bytes which are currently
reflected.
OK, let me rephrase: why do you need more than 8 bytes? It looks like
it has been working rather well for 20+ years.
Coming late to the game (I was away for vacation)...
It's handy to have more than 8 bytes of returned payload for ICMP
packets to allow for more sophisticated network health scanning metrics.
Back when I worked at UUNET, we used the ICMP ECHO REQUEST packets to
carry accurate timestamps for monitoring dispersion of multicast
datagrams to select hosts. I know, ICMP ECHO REQUEST packets have
required all payload to be returned since at least RFC 1712 - so it's
not exactly the same as what is being change here...
I imagine that a similar generic treatment of payload data for other
ICMP type message might be handy too.
-Kurt
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