Document using Q_ML2_PLUGIN_PATH_MTU
I tested it, and it works!
Change-Id: Ic345ededc37b2e0b7b5dbeb397aa55540d5c3bd8
Related-Bug: #1527675
diff --git a/doc/source/guides/neutron.rst b/doc/source/guides/neutron.rst
index 84295a5..7f93bad 100644
--- a/doc/source/guides/neutron.rst
+++ b/doc/source/guides/neutron.rst
@@ -23,7 +23,9 @@
In most cases where DevStack is being deployed with a single
interface, there is a hardware router that is being used for external
connectivity and DHCP. The developer machine is connected to this
-network and is on a shared subnet with other machines.
+network and is on a shared subnet with other machines. The
+`local.conf` exhibited here assumes that 1500 is a reasonable MTU to
+use on that network.
.. nwdiag::
@@ -434,6 +436,16 @@
Miscellaneous Tips
==================
+Non-Standard MTU on the Physical Network
+----------------------------------------
+
+DevStack defaults to assume that the MTU on the physical network
+is 1500. A different MTU can be specified by adding the following to
+the `localrc` part of `local.conf` on each machine.
+
+::
+ Q_ML2_PLUGIN_PATH_MTU=1500
+
Disabling Next Generation Firewall Tools
----------------------------------------