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From: Lowell Gilbert <Lowell@Be-Well.Ilk.Org>
To: Aryeh Friedman <aryeh.friedman@gmail.com>
References: <CAGBxaXmRObHBrRauXqFiy71FT6KnuztzW9jBmvYKU+9MdJqsQQ@mail.gmail.com>
Date: Thu, 21 Jul 2011 09:56:50 -0400
In-Reply-To: <CAGBxaXmRObHBrRauXqFiy71FT6KnuztzW9jBmvYKU+9MdJqsQQ@mail.gmail.com>
	(Aryeh Friedman's message of "Thu, 21 Jul 2011 04:00:20 -0400")
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Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject: Re: best way to force a single packet to be sent via a specific
	interface
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Aryeh Friedman <aryeh.friedman@gmail.com> writes:

> I have both ethernet (the default route and such) and ppp done via
> "ppp -ddial" the man page for ppp(8) says tun0 will not have an IP
> assigned until a single packet is sent on it... what is the best way
> to have one packet sent on it (ping only always ifaces on multicast,
> traceroute seems to have no way to say exit after the first hop and/or
> after one packet is sent, tcpdump refuses a "-c 0" arg saying it is
> illegal)

I can't parse what you said about ping.  
I seem to recall doing that (with '-I' back when I was doing demand
dialing with ppp(8).