ICMP Host-Unreachable

Question

How do I know if I got an ICMP Host Unreachable after trying to send some data to a UDP port ? I want to check for opened UDP ports on a machine.

http://www.faqs.org/rfcs/rfc792.html – Anders Jan 09 '11 at 16:42 — Anders, Jan 09 '11 at 16:42

score 1 · Accepted Answer · edited May 23 '17 at 12:11

1

Use connect(2) - you'll get an error on the second send, see more about connected UDP sockets.

edited May 23 '17 at 12:11

Community

answered Jan 10 '11 at 02:30

Nikolai Fetissov

1 Answers1