Thanks ikegami, you are right! I tried the script and the discovery packet with a non-zero SA packet can be recognized by the DHCP server, which means my assumption is wrong. Thank you all :-)

In reply to Re^2: how can I set LocalAddr to INADDR_ANY in IO::Socket::INET by phio
in thread how can I set LocalAddr to INADDR_ANY in IO::Socket::INET by phio

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