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Forum Discussion

Garth_104943's avatar
Garth_104943
Icon for Nimbostratus rankNimbostratus
Feb 18, 2010

Name resolution based on source IP

Newbie question, but please let me know if this is possible.     I have a domain www.mydomain.com that resolves publicly to one address (akamai cached)   The same domain www.mydomain....
application delivery
dev
devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Feb 18, 2010
You could take the name lookup functionality from the first Codeshare example below and modify it to do a lookup every X seconds as in the second example:

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/DestinationSnatUsingDNS.html

 

http://devcentral.f5.com/wiki/default.aspx/iRules/LogEveryXSeconds.html

 

 

You might also want to consider upgrading to 10.1 to use the new RESOLV::lookup command:

 

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/resolv__lookup

 

 

Like the NAME::lookup command, RESOLV::lookup performs a DNS query, returning the A record for the indicated hostname, or the PTR record for the indicated IP address. The functional difference between the two is that RESOLV::lookup suspends and returns the result inline, whereas NAME::lookup continues and eventually causes NAME_RESOLVED to fire and then you need to call NAME::response to retrieve it.

 

 

 

 

Aaron