dig query

[John Williams]

I've a system with two interfaces; a management and a data interface.  My default route is set out to the data interface.  

doing a 


dig +tcp someIP.com @some.resolver 


works fine.

If I want a UDP based query, I have to specify -b option and provide IP of the interface otherwise it fails.

Why is that?

I would imagine the query would travel out the default route of the host.

Thanks.
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