you probably have a group config to nat the servers ip address.
you can remove the group to disable completely nat for traffic issued by the servers.
If you need nat for some traffic, you can keep the group but remove all servers from its definition.
[so you just havea group name and a vip].
Then use an acl to define the traffic that needs to be nated using a command like this
acl 1
clause 10 permit udp any eq 123 destination any eq 123
clause 20 permit udp any destination any sourcegroup
clause 30 permit any any destination any
in this example, NTP traffic is permitted but not natted.
the rest of udp traffic is permitted but natted.
Finally, the rest of the traffic is permitted but no nating.
Regards,
Gilles.
