How to configure DNS resolution to send multiple simultaneous requests when resolving a name?
Posted on 2003-10-29
Several times each year my ISP's name servers stop working for whatever reason.
I want my RedHat box to overcome this efficiently.
I would prefer if every name lookup my OS makes causes multiple UDP packets to be sent out to multiple different name servers, and for the first useful reply to be the one used.
I don't really want round-robin DNS lookups, nor do I want it to wait for one to fail before trying a second one - I want to achieve fast operation by using multiple simultaneous queries.
If this can be done - how do I set it up?
I plan to use my normal ISP's name server, the name server of my ISP's ISP, and the name server of a completely unrelated ISP elsewhere - all at once.