Determining availability of a remote machine
mbp at sourcefrog.net
Wed Apr 2 20:46:22 EST 2003
On 2 Apr 2003, Warwick Mitchell <wmitchell at shed.org.au> wrote:
> On Wed, 2 Apr 2003, Kim Holburn wrote:
> > It relies on an icmp reply to a udp packet (port not in use or
> > some such. The icmp is generated by the remote machine not
> > traceroute.
> indeed. The original question said that icmp wasn't suitable. So I
> assumed that meant both ways.
ICMP is a non-optional part of TCP/IP. Blocking it altogether (if
that is in fact what is being done) is not a very good idea.
You could also try arping, assuming they're on the same segment.
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