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

kalae % ./udpcli01 gemini.tuc.noao.edu echo
hi there
ICMP error: type = 3, code = 3
hello
socket timeout
testing
ICMP error: type = 3, code = 3