Reopen this issue if this use case still exist after 10 years.
Mike Huot May 18, 2005 at 10:11 AM
I figured out why the tcpdump does not show any response. nmap uses the lack of an ICMP unreachable for a port as saying the port is open. Not sure how we would work with this. Java does not handle ICMP. We would need some sort of API to interact with the AV agent at the UDP level completely.
10:36:33.589037 IP 128.11.120.78.47010 > acslondc1.acslon.com.2967: UDP,
length: 0
0x0000: 4500 001c 4bd1 0000 3011 996c 800b 784e E...K...0..l..xN
0x0010: ac1c 011e b7a2 0b97 0008 9710 ............
10:36:34.589660 IP 128.11.120.78.47011 > acslondc1.acslon.com.2967: UDP,
length: 0
0x0000: 4500 001c 5711 0000 2e11 902c 800b 784e E...W......,..xN
0x0010: ac1c 011e b7a3 0b97 0008 970f ............