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Eric_27158's avatar
Eric_27158
Icon for Nimbostratus rankNimbostratus
Nov 24, 2010

GTM and DNS caching for UDP connections

Hey all, thanks for reading....     I've run into a situation where an outage to a GTM pool node causes problems with client-side DNS caching. For example, I have two nodes in a GTM pool and th...
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naladar_65658's avatar
naladar_65658
Icon for Altostratus rankAltostratus
Nov 29, 2010
I remembered reading a post one time about turning off SNAT for certain connections going through an LTM VIP. You might give this a read to see if it can be applied to your situation:

 

 

http://devcentral.f5.com/Forums/tabid/1082223/asg/50/showtab/groupforums/afv/topic/aff/5/aft/24878/Default.aspx

 

 

If it was HTTP traffic then X-Forwarded-For would be the ticket... As far as best practice for DNS TTL's, I have always used 30 seconds on my A records. I don't know if that is a best practice or not, but I haven't had any issues with that so far.