>    edns-buffer-size: <number>
>               Number of bytes size to advertise as the EDNS reassembly 
> buffer
>               size.   This  is  the  value put into datagrams over UDP 
> towards
>               peers.  The actual buffer size is determined by 
> msg-buffer-size
>               (both  for  TCP  and  UDP).   Do not set higher than that 
> value.
>               Default is 4096 which is RFC recommended.  If you have 
> fragmen-
>               tation  reassembly  problems,  usually  seen as timeouts, 
> then a
>               value of 1480 can fix it.