Load Balance UDP (Retain Source Client IP)

if F5 enable automap or snat，Unlike the TCP protocol, TCP has tcp option filling options(such as tcp option 28,29,254). If it is not a specific UDP protocol, such as DNS, the edns field of DNS can be inserted into the client ip (this belongs to the application layer inserting the client ip), it can only be used in your UDP data. The first 4 bytes or the last 4 bytes are inserted into the client's ipv4 address. This makes you have to retrofit your application, the useful data is to skip the first 4 bytes or discard the last 4 bytes