① _aa_address
/kingyea/service/send_res
② _bb_address
公安内网 ( Ⅰ/B )
/kingyea/service/recv_req
Ⅱ _bb_address
④ _aa_address_back
/kingyea/service/recv_res
子网 ( ①/A )
/kingyea/service/send_req
边界
Ⅰ _aa_address
③ _bb_address_back
Ⅲ _bb_address_back
Ⅳ _aa_address_back
