[32829] in North American Network Operators' Group
Re: Packet Loss
daemon@ATHENA.MIT.EDU (Alex Bligh)
Thu Dec 14 14:36:13 2000
From: Alex Bligh <amb@gxn.net>
To: "Tony Rall" <trall@almaden.ibm.com>
Cc: nanog@merit.edu
In-reply-to: Your message of "Thu, 14 Dec 2000 09:50:28 PST."
<OF7F047445.D02E1C30-ON882569B5.0060B0FA@LocalDomain>
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Date: Thu, 14 Dec 2000 19:25:51 +0000
Message-Id: <E146e0l-0000KB-00@sapphire.noc.gxn.net>
Errors-To: owner-nanog-outgoing@merit.edu
trall@almaden.ibm.com said:
> I'll speculate that it occurs when packets destined for a destination
> do
> not get there. Most people see it via dropped ping packets..
> What ping really tells you is that either the packets from A to B are
> being lost or those from B to A are being lost.
Or that B is (perhaps deliberately - filtering ICMP echo or
ratelimiting echo response) not responding to the ICMP echo
request. This happens in Real Life (tm).
(pedantic: - or that A is discarding them as opposed to transmitting
them or ignoring the responses on receipt both of which have
been known to happen in badly configured NMS situations).
--
Alex Bligh
VP Core Network, XO Communications - http://www.xo.com/
(formerly Nextlink Inc, Concentric Network Corporation
GX Networks, Xara Networks)
