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1. socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
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²»ÄÜ:²»ÄÜÊÕµ½·Ç·¢Íù±¾µØipµÄÊý¾Ý°ü(ipÈí¹ýÂ˻ᶪÆúÕâЩ²»ÊÇ·¢Íù±¾»úipµÄÊý¾Ý°ü).
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2. socket(PF_PACKET, SOCK_RAW, htons(x));
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