doc: remind user to calculate the correct max port

This was kind of easy to miss, and if users
just paste in the command as given then their
first few OSDs will work, and from their
4th OSD onwards things will get weird.

Signed-off-by: John Spray <john.spray@redhat.com>

diff --git a/doc/rados/configuration/network-config-ref.rst b/doc/rados/configuration/network-config-ref.rst
index 4e729a4b1d45d540b66cd8fc85e74bf9d4948f3b..440e476f420258e241f2b5f021a223e9dcc5c2cc 100644 (file)
--- a/doc/rados/configuration/network-config-ref.rst
+++ b/doc/rados/configuration/network-config-ref.rst
@@ -160,6 +160,9 @@ public or cluster network. For example::
 
        sudo iptables -A INPUT -i {iface}  -m multiport -p tcp -s {ip-address}/{netmask} --dports 6800:6810 -j ACCEPT
 
+Be sure to replace the "6810" in the above example with an upper bound that
+reflects the number of daemons you will be running on this host.
+
 .. tip:: If you run Ceph Metadata Servers on the same Ceph Node as the 
    Ceph OSD Daemons, you can consolidate the public network configuration step. 
    Ensure that you open the number of ports required for each daemon per host.