Re: Dumb question: ping w/o icmp support?

Charles Hedrick (njin!!!
21 Oct 88 01:31:01 GMT

>> A number of the machines I use support only the tcp and udp protocols.
>> I'd really like to be able to ping from them. Is there any hope, short
>> of harrassing the vendors?

I think there is a confusion here. If they support TCP and UDP they
have to support IP. (IP is the lower layer on top of which TCP and
UDP are implemented.) Ping is implemented using ICMP echo. The IP
specifications require all IP implementations to support ICMP echo.
Now technically speaking all the spec requires is that your machine
must respond to echos sent by other machines. But once the mechanism
is present, I'd be a bit surprised if there isn't a way to issue a
ping yourself. So I'll bet there's some way to make it work. What
implementations are we talking about?

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