exchange snat pool irule

gistfile1.txt

when RULE_INIT {
  # Use a local array to configure SNAT addresses.
  # These addresses do not need to be defined in a SNAT pool or elsewhere;
  # they simply need to be free IP addresses LTM can use to as a source
  # for server-side connections, and are typically on the same subnet as
  # the pool members. In this example, we use three addresses. Replace
  # these with free IP addresses appropriate to your network topology.
  # Follow the pattern of the existing addresses to add more than three.
  set static::snat_ips(0) 10.0.0.1
  set static::snat_ips(1) 10.0.0.2
  set static::snat_ips(2) 10.0.0.3
}
when CLIENT_ACCEPTED {
  # Calculate the crc32 checksum of the client IP.
  # Use the modulo of the checksum and the number of SNAT IPs in the array
  # to select a SNAT IP address.
  snat $static::snat_ips([expr {[crc32 [IP::client_addr]] % [array size static::snat_ips]}])
}