Forum Discussion

IRONMAN's avatar
IRONMAN
Icon for Cirrostratus rankCirrostratus
Jun 05, 2019

LTM VIP IP range out of self IP range, but still working

I am facing some challenges, when we upgraded to new setup We have single vlan test 1 for VIP's. we configured the self IP 10.40.0.16/255.255.252.0 , which has host range 10.40.0.1 - 10.40.3.254, B...
application delivery
BIG-IP
LTM
  • nathe's avatar
    nathe
    Jun 05, 2019

    Ironman,

    ​

    ​Virtual Addresses /VIPs dont have to be in the self-IP address space of the VLAN but you would need to have an explicit route to the VIP address from upstream devices to the bigip

     

    Note, the LTM will not send Gratuitous ARPs for such Virtual IPs after going Active - this may cause traffic issues when failover occurs.

    ​

    So, it's recommended to have the VIP in the same address space but not mandatory.

    ​

    Hope this helps,

    ​

    N​

nathe's avatar
nathe
Icon for Cirrocumulus rankCirrocumulus
Jun 14, 2019

It would be a route required from upstream devices to F5. Without GARP then a protocol like HSRP would need to be in place, or a way of the upstream devices know that failure had occurred. Actually MAC Masquerade on the F5 would help too - take a look into this - this is when the MAC address is the same.

 

Hope this helps,

 

N