[12518] in North American Network Operators' Group

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Re: Traffic Engineering (fwd)

daemon@ATHENA.MIT.EDU (Brett Frankenberger)
Thu Sep 18 19:58:27 1997

From: Brett Frankenberger <brettf@netcom.com>
To: ekgermann@cctec.com (Eric Germann)
Date: Thu, 18 Sep 1997 18:43:26 -0500 (CDT)
Cc: nanog@merit.edu
In-Reply-To: <3.0.32.19970918171610.006eb1bc@209.45.128.20> from "Eric Germann" at Sep 18, 97 05:16:13 pm

:: Eric Germann writes ::
> 
> Granted, ping tends to get dropped on the floor at overloaded points, 

A common misconception.  Hosts (including the host functionality
internal to a router) may deal with pings differently depending on load
-- for example, pinging a router might result in delayed responses if
the router is busy.  But routers do not stop forwarding pings when they
are overloaded.  In the absence of traffic filters, a router (in the
general case -- there's probably an exception to prove the rule) will
forward a ping (that is not addressed to the router) with the same
priority as it will forward a TCP frame (that is not addressed to the
router.)


          - Brett  (brettf@netcom.com)
 
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