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William_Benett1's avatar
William_Benett1
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Oct 20, 2006

LB based on DNS response?

Hi folks,     I'm trying to write an iRule to perform a DNS lookup on the IP address of the client, and based on something contained in the reverse, make a load balancing decision.     Ini...
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William_Benett1's avatar
William_Benett1
Icon for Nimbostratus rankNimbostratus
Oct 20, 2006
So adding some more data into this. . .

 

 

It looks like the tmm_config.tcl changes I made were causing the resolve call to go into nowhere. I changed it to point to a hard coded DNS server instead of $IP_ADDR_LOCALHOST. Now I can write an iRule that can successfully log the reverse of the client IP address. I'm guessing that I need named running on the BIG-IP so it can query itself. Just a caveat I suppose, I've moved on from that.

 

 

I'm now getting a TCL error: Rule DNSbasedLD - Address in use (line 3) invoked from within "pool www-pool2"

 

 

I still believe that i'm not allowed to make LB decisions in the NAME_RESOLVED event. The only thing I can think of is writing a method, in this iRule, to load balance using the "node" command. That seems really icky. Any advise would be appreciated.