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dragonflymr's avatar
dragonflymr
Icon for Cirrostratus rankCirrostratus
Feb 19, 2015

Two data centers and fixed IP

Hi,

 

I wonder what could be solution for such a case:

 

  1. Two DC
  2. Each DC connected via different ISP with different public IPs
  3. GTM's used to direct traffic for given FQDN to active VIP in correct DC
  4. FQDN is of cource static but A record returned is changing, so different IP behind some FQDN depending on situation
  5. Services offered by customer are accessed by plenty of external apps that are using hard coded IP instead of FQDN for sending requests (mainly banks).
  6. Customer has no way to force external parties to change code in applications.

Is there some way to configure GTM/LTM system so independent of in which DC given VIP is active the same IP is returned for given FQDN. Is that at all issue related to GTM/LTM system or rather to external ISP/routing infrastructure?

 

Piotr

 

APM
application delivery
design
LTM
management
security
TMOS

1 Reply

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  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Feb 20, 2015

    If your goal is to force all traffic to one IP address for this scenario, I'm not sure why you'd need GTM unless it's to offload the weight of massive request volume. This is possible, but challenging in that you would need to either have duplicate front ends that can handle traffic arriving in both locations and using a shared backend, or perhaps a little simpler but not without its own challenges, extending an L2/L3 segment at the front door of both datacenters and use LTM in an active/standby scenario by datacenter (by system or just by a traffic group basis)

     

    I'd suggest a professional services engagement or plan on a lot of lab time to iron out all the details and gotchas likely to arise.