doc: Add firewalld notice in fedora

Add a note in the fedora build guide on how to disable
firewalld and clear iptables that come by default.

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>

diff --git a/doc/developer/building-frr-for-fedora.rst b/doc/developer/building-frr-for-fedora.rst
index 0208f1146b401949597747862378d917a4b6eacf..0bfd43e93cbdb8c73cb1a6aab38e813eb8750633 100644 (file)
--- a/doc/developer/building-frr-for-fedora.rst
+++ b/doc/developer/building-frr-for-fedora.rst
@@ -98,6 +98,18 @@ And load the kernel modules on the running system:
 
    sudo modprobe mpls-router mpls-iptunnel
 
+
+.. note::
+   Fedora ships with the ``firewalld`` service enabled. You may run into some
+   issues with the iptables rules it installs by default. If you wish to just
+   stop the service and clear `ALL` rules do these commands:
+
+   .. code-block:: console
+
+      sudo systemctl disable firewalld.service
+      sudo systemctl stop firewalld.service
+      sudo iptables -F
+
 Install service files
 ^^^^^^^^^^^^^^^^^^^^^