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Sanket_A_298205's avatar
Sanket_A_298205
Icon for Nimbostratus rankNimbostratus
Apr 25, 2017

LTM VIP CNAME or 'A' record

Hi All, I am new to F5 community - please assist me with the below. I have VIP configured on F5 LTM - which is a CNAME record, due to some recommendation from the vendor which needs to be changed to 'A' record. Please note: the VIP and the associated IP address remains the same. I just wanted to confirm if there would be any impact from F5 prospective - do I need to do any changes? My understanding is - as long as the VIP resolves to the same IP address - which is configured as VIP (be it CNAME or A record) there shouldn't be any impact/changes required from LTM end.

 

Please feel free to correct/suggest.

 

application delivery
BIG-IP
LTM

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  • Vijay_E's avatar
    Vijay_E
    Icon for Cirrus rankCirrus
    Apr 25, 2017

    As long as you don't change anything on the LTM, it shouldn't be a problem from F5's perspective. This is more of a DNS propagation issue. Lower the TTL, wait for 2 days or however long the TTL is now and then make the changes, just to be sure.

     

  • Nicholas_P__308's avatar
    Nicholas_P__308
    Icon for Cirrus rankCirrus
    Apr 25, 2017

    CNAME is for alias websites under a global DNS name. You need to have the DNS pointing to the A record (main url) CNAME would be testsite.mainsite.com for instance. DNS will need to propagate then user access should resume, until then I.P. address will be access to the site. You can push a DNS update as well if time is a factor.

     

    Also, I feel there is some confusion. Virtual Server name has no bearing on the DNS record pointing to it.