Persistence options for UDP Application

First why are you using

uie

persistence profile if you all you need/want is source address persistence? If you are using source IP then you do not need to make is this complex with

uie

and simply use source address.

Second the commands

persist

and

session

do different things,

persist

is purely for creating, looking up and removing persistent records (core session table records). The

session

is used for storing arbitrary/additional information in the session table.

Use

persist

instead of

session

for what you are trying to achieve, for example:

when CLIENT_ACCEPTED {
    set src_IP [IP::client_addr]
    if {[persist lookup uie $src_IP]} {
        persist uie $src_IP
        log local0. "existing client port [persist lookup uie $src_IP] for client ip $src_IP"
    } else {
        persist add uie $src_IP 1800
        log local0. "added client port [persist lookup uie $src_IP] for client ip $src_IP "
    }
}

NOTE: this is just a UIE version of source address persistence and at that more complex than needed as the following does the same:

when CLIENT_ACCEPTED {
    persist uie [IP::client_addr] 1800
}