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rajesh1's avatar
rajesh1
Icon for Nimbostratus rankNimbostratus
Mar 29, 2010

Site Failure - GTM/LTM

Hi,

 

 

Can some suggest me the F5 GTM/LTM Configuration for the following requirement

 

 

I am running same web application (www.example.com)running both HTTP and HTTPS in two datacenters (Site1 and Site2) using F5 GTM's and LTM's and loadbalancing in Round robin fashion between both the sites.

 

 

Performing SSL offloading for Https Application

 

 

 

Site 1

 

 

Virtual-Site1 - 1.1.1.1

 

Pool-site1 -

 

Member1

 

Member2

 

 

Site 2

 

 

Virtual-Site2 - 2.2.2.1

 

Pool-site1 -

 

Member1

 

Member2

 

 

As a result of the DNS caching in the client browsers/Book marking the webpages the traffic will directed to the failed site in Case of failure of Member 1 and Member 2 in the site1 .

 

 

How do we need to fix the issues with DNS caching or book marking for HTTP and HTTPS Traffic.

 

 

What are recommended Configurations for -

 

 

Http Redirect ??

 

Http Fallback ??

 

 

Thanks in Advance

 

Raj

 

 

config
design

1 Reply

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  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Mar 29, 2010
    bookmarking a page saves the name, not the ip, so that shouldn't be a problem. You have system cache, which most current OS's honor TTL, then you have browser caches, none of which honor TTL (last I checked, IE through 7 cached for 30 minutes, FF for 1 minute, not sure on Chrome)

     

     

    Setting lower ensures a faster failover at the ldns layer, but also increases traffic handling requirements (ex, if you set at 5 minutes versus the 30 sec default, you decrease the poll interval by 10x).