A UDP service FlagServ is running at flagserv.cse543.rev.fish:13337. This UDP service

receives a target IP address from the user, and if the user is authenticated, it will happily send a

flag (a special string) via UDP to port 13337 of the target IP. we need to retrieve the flag.

FlagServ employs THE BEST AUTHENTICATION METHOD IN THE WORLD: Source-IP-based

authentication, which means it authenticates all users based on their source IP addresses. If a

user's source IP address is trusted, FlagServ will send out the flag to the specified destination

(repeat: via UDP). Otherwise, it will send an error message back to the untrusted user (via UDP,

too).

The only trusted IP is 10.2.4.10. Your task is to break or bypass this source-IP-based

authentication scheme and steal the flag.