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HA13029's avatar
HA13029
Icon for Nimbostratus rankNimbostratus
Feb 23, 2018

SNAT pool with different IP address

Hello,

 

I have a SNAT pool with different IP address in different range (like 192.168.1.5 and 192.168.2.5). The virtual server has a pool of server in these different range (192.168.1.100 and 192.168.2.100). In my config I have I have two vlans SELFIP 192.168.1.1 and 192.168.2.1. I need to be sure traffic going to 192.168.1.100 use the Pool IP 192.168.1.5 and traffic going to 192.168.2.100 use the Pool IP 192.168.2.5. Is it the default behaviour of F5 ? Does the F5 choose the Pool IP based on the Destination VLAN network ?

 

Regards,

 

HA

 

application delivery
LTM
  • Niels_van_Sluis's avatar
    Niels_van_Sluis
    Icon for MVP rankMVP
    Feb 23, 2018

    Yes, see this article:

     

    https://support.f5.com/csp/article/K7820

     

    When using a SNAT pool with IP addresses from the egress VLAN (the VLAN for which the packet exits in the BIG-IP system) and non-egress VLAN networks, the egress VLAN network address is given higher priority. For example, egress VLAN external has a self IP of 172.16.0.254/24, and SNAT pool member addresses of 172.16.0.1/24 and 10.1.1.1/24. The BIG-IP system prefers the egress VLAN SNAT pool member address 172.16.0.1, and will continue to use the same address until it becomes unavailable.