This causes the IP packets to be fragmented. During IKEv2 connection establishment, payload sizes may exceed the IP Maximum Transmission Unit (MTU) for the network path between the client and server. VPN error code 809 can also be caused by IKE fragmentation when using the IKEv2 VPN protocol. On the Citrix NetScaler a “persistency group” must be defined. On the F5 BIG-IP a custom “persistence profile” must be configured. For example, on the KEMP LoadMaster the administrator will configure “port following”. This commonly requires custom configuration. For IKEv2 specifically, it is crucial that UDP ports 5 be delivered to the same backend server.
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