Clarify the documentation about DF-flag

Remove the reference to setting the DF-flag as we don't do that right
now.  Rephrase the paragraph that the default value should not be
causing fragmentation.

(cherry picked from commit 61f276d5a407a473bc762cde25d417370c3f5ca0)

diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index 428a1e873c36b078d4dd183418eddac1534be242..0732009146cfd9728bbae54b481de61131fb24d7 100644 (file)
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -3566,9 +3566,8 @@ Tuning
    to be sent without fragmentation at the minimum MTU sizes for
    Ethernet and IPv6 networks.)
 
-   The ``named`` now sets the DON'T FRAGMENT flag on outgoing UDP packets.
-   According to the measurements done by multiple parties this should not be
-   causing any operational problems as most of the Internet "core" is able to
+   According to the measurements done by multiple parties the default value
+   should not be causing the fragmentation as most of the Internet "core" is able to
    cope with IP message sizes between 1400-1500 bytes, the 1232 size was picked
    as a conservative minimal number that could be changed by the DNS operator to
    a estimated path MTU minus the estimated header space. In practice, the