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pmilot's avatar
pmilot
Icon for Altostratus rankAltostratus
Oct 22, 2013

DNS Resolver Cache

Hi,

 

I'm currently investigating the option to dispose of my LDNS servers and let the LTM do the recursive lookups for my clients and cache responses.

 

I have read the following statement from there site and I'm wondering if this statement applies to what I was trying to do.

 

"It is important for network architects to note that it is possible to configure the local BIND instance on the BIG-IP® system to act as an external DNS resolver. However, F5 Networks does not recommend this approach, because the performance of BIND is slower than using a resolver cache."

 

Basically what I was trying to accomplish is have my clients (linux, windows, etc) point to the LTM as their DNS servers, and let the DNS resolve and cache.

 

Thanks

 

application delivery
application performance
availability
design
dns
performance

2 Replies

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  • Kevin_Stewart's avatar
    Kevin_Stewart
    Icon for Employee rankEmployee
    Oct 22, 2013

    You can technically enable bind on an LTM, but it isn't going to be any better or faster than your current bind solution. My recommendation is to look at licensing/provisioning the Global Traffic Manager (GTM) module. That will give you GSLB, ZoneRunner for non-load balanced (bind-like) DNS, DNSSEC, additional caching/resolving capabilities, and DNS Express for DDoS-immune resolution.

     

  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    Oct 22, 2013

    Kevin's suggestion is quite valid but perhaps overkill for your requirements if your clients are internal; I'd suggest the DNS Services feature set would suffice if they are.