Add directed broadcast forwarding documentation

2 files changed, 27 insertions, 2 deletions

diff --git a/docs/_include/interface-ip.txt b/docs/_include/interface-ip.txt
index 75441040..4164985b 100644
--- a/docs/_include/interface-ip.txt
+++ b/docs/_include/interface-ip.txt
@@ -19,7 +19,7 @@
   {{ var5 }} {{ var6 }} ip arp-cache-timeout
 
   Once a neighbor has been found, the entry is considered to be valid for at
-  least for this specifc time. An entry's validity will be extended if it
+  least for this specific time. An entry's validity will be extended if it
   receives positive feedback from higher level protocols.
 
   This defaults to 30 seconds.
@@ -64,6 +64,22 @@
     set interfaces {{ var0 }} {{ var1 }} {{ var2 }} {{ var4 }} {{ var5 }} {{ var7 }} ip disable-forwarding
 
 .. cfgcmd:: set interfaces {{ var0 }} <interface> {{ var2 }} {{ var3 }}
+  {{ var5 }} {{ var6 }} ip enable-directed-broadcast
+
+  Define different modes for IP directed broadcast forwarding as described in
+  :rfc:`1812` and :rfc:`2644`.
+
+  If configured, incoming IP directed broadcast packets on this interface will
+  be forwarded.
+
+  If this option is unset (default), incoming IP directed broadcast packets
+  will not be forwarded.
+
+  .. code-block:: none
+
+    set interfaces {{ var0 }} {{ var1 }} {{ var2 }} {{ var4 }} {{ var5 }} {{ var7 }} ip enable-directed-broadcast
+
+.. cfgcmd:: set interfaces {{ var0 }} <interface> {{ var2 }} {{ var3 }}
   {{ var5 }} {{ var6 }} ip enable-arp-accept
 
   Define behavior for gratuitous ARP frames who's IP is not already present in
diff --git a/docs/configuration/system/ip.rst b/docs/configuration/system/ip.rst
index 78aeef4e..f36cf9f5 100644
--- a/docs/configuration/system/ip.rst
+++ b/docs/configuration/system/ip.rst
@@ -9,6 +9,15 @@ System configuration commands
 
    Use this command to disable IPv4 forwarding on all interfaces.
 
+.. cfgcmd:: set system ip disable-directed-broadcast-forwarding
+
+   Use this command to disable IPv4 directed broadcast forwarding on all
+   interfaces.
+
+   If set, IPv4 directed broadcast forwarding will be completely disabled
+   regardless of whether per-interface directed broadcast forwarding is
+   enabled or not.
+
 .. cfgcmd:: set system ip arp table-size <number>
 
    Use this command to define the maximum number of entries to keep in
@@ -67,4 +76,4 @@ And the different IPv4 **reset** commands available:
      bgp           Clear Border Gateway Protocol (BGP) statistics or status
      igmp          IGMP clear commands
      multicast     IP multicast routing table
-     route         Reset IP route
\ No newline at end of file
+     route         Reset IP route