kalae % ./udpcli01 gemini.tuc.noao.edu echo
hi there
ICMPv4 error: dest = 140.252.8.54.1792, type = 3, code = 3


kalae % ./udpcli01 198.82.204.99 echo
hello, world
ICMPv4 error: dest = 198.82.204.99.1792, type = 11, code = 0
testing
ICMPv4 error: dest = 198.82.204.99.1792, type = 11, code = 0