Testing to find out if a cable or DSL modem is online or not

[Robert Brockway]

On Fri, 30 Apr 2004, Marcus Brubaker wrote:

> I think the ping failure may be different depending on whether the
> machine is down, at least in terms of power.  For instance if the
> machine is powered down it should return "Destination host unreachable"

For those wondering how a host that is down could return a packet (my last
email probably implied this also :) it is infact the host before the one
that is down that passes back icmp-host-unreachable.  Unfortunately all
too many firewalls are broken and drop all icmp packets on the floor.
Some icmp packets really need to get through for proper functioning of
the Internet.

Rob

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Robert Brockway B.Sc. email: robert-5LEc/6Zm6xCUd8a0hrldnti2O/JbrIOy at public.gmane.org, rbrockway-cFo9iiqjkw8eIZ0/mPfg9Q at public.gmane.org
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