On Wed, Sep 04, 2013 at 03:11:17PM +0100,
 Jim Reid <[email protected]> wrote 
 a message of 11 lines which said:

> Don't fragment at all, set TC=1 on responses which would cause UDP
> or lower layer fragmantation 

Not obvious to implement, the application (the name server) typically
does not know the path MTU before sending an UDP packet to a
destination (it's the kernel's job).

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