Hey, Currently, traffic received for a given VIP (or VIP prefix) is tunneled using GRE towards the different ASs in a way that (tries to) ensure that a given session will always be tunneled to the same AS.
But in real environment, many Application Servers do not support GRE feature. So we raise a requirement for LB in VPP: (1). When received traffic for a VIP, the LB need to do load balance, then do DNAT to change traffic's destination IP from VIP to AS's IP. (2). When returned traffic from AS, the LB will do SNAT first to change traffic's source IP from AS's IP to VIP, then go through load balance sessions, and then sent to clients. Any comments about this requirement are welcome. Thanks a lot, Hongjun
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