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Ashraf_Ali_2021's avatar
Ashraf_Ali_2021
Icon for Nimbostratus rankNimbostratus
May 14, 2015

LTM bounce back scenario - Question

Hi Experts,

 

I am running f5 as Default gateway , and have two sets of servers(Web, Db) in the same subnet (172.16.0.1/24) For web servers (172.16.0.10 - 15 , with Dg 172.16.0.1 ) and Db servers (172.16.0.100 - 112 , with Dg 172.16.0.1)

 

Where as 172.16.0.1 is the flooting ip of Vlan 100 in F5 (port 1.1), now the requirement is to allow connectivity between web server and Db server with load balance in the same subnet.

 

So my Question are :

 

  1. What should be configured in virtual server configuration (the Source and destination addresses) ?
  2. what ip , the web servers have to use to connect the db servers ( it is 172.16.0.100 to 112 or some other ip), If the web server uses the actual ip's, of Db servers, the request will never go to Default Gateway(F5), it will just do the ARP and will connect directly to DB server.

Request all expert to Answer Quickly in detail , as i need to implement the same ASAP.

 

Thank you, Ashraf

 

application delivery
deployment
design
LTM

3 Replies

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  • nathe's avatar
    nathe
    Icon for Cirrocumulus rankCirrocumulus
    May 14, 2015

    Create a Virtual Server (one for Web access and one for DB access) and have the web servers as one pool and the DB servers as another pool. You'll need to use SNAT Automap though to ensure the return traffic goes back to the BIG-IP and not directly to the server, as they're on the same subnet.

     

    Hope this helps,

     

    N

     

  • Ashraf_Ali_2021's avatar
    Ashraf_Ali_2021
    Icon for Nimbostratus rankNimbostratus
    May 14, 2015

    Thanks Nathan,

     

    Could you please explain me , what should be configured as source and destination addresses in each Virtual server. As i have mentioned above , the ip's for web servers are (172.16.0.10- 15) and Db server (172.16.0.100- 102).

     

    And What ip to be configured in Web server to refer Db server ?

     

    Please take an example and explain.

     

    Regards, Ashraf

     

    • nathe's avatar
      nathe
      Icon for Cirrocumulus rankCirrocumulus
      May 14, 2015
      the virtual server(s) could have any free IP address on the 172.16.0.1/24 subnet as the destination. No need for source address configuration here. you would then refer the web server to the virtual server ip address when accessing the db server.