Watchguard V10 Command Line Interface Manual page 69

Top-level configuration mode commands
(For one-to-one and subnet-to-subnet mapping)
This argument specifies (1) that this is a static NAT
action, and records the address groups associated
with the internal and external sources. The address
groups can be single IP addresses or subnets.
-vip <round-robin|wround-
robin|random|wrandom| \
least-connection|wleast-connection> | -
server [+] \
{<IP address> [IP address] ...<port>
<weight>}>
This argument specifies that this is a load-
balancing (virtual IP) NAT action, and records (1)
the algorithm that will be applied and (2) the server
addresses and port numbers. If a weighted
algorithm is used, this argument adds (3) the per-
server weight assignments.
The load-balancing algorithm argument values
include the following entries:
round_robin : Denotes the round robin algorithm
wround_robin : Denotes weighted round robin
random : Denotes random
wrandom : Denotes weighted random
least_connection : Denotes least connection
wleast_connection : Denotes weighted least
connection
TIP
If you are adding a new server/weight to an
existing VIP NAT action, prefix the new server
record with a "+" character.
If you are entering the "server" argument, you
must note (1) the IP address of the server, the port
number it will watch and the proportion of traffic
this server will be assigned, noted as a whole
number.
WatchGuard Command Line Interface Guide 55