Add clamp-mss-to-pmtu option and description

1 files changed, 11 insertions, 22 deletions

diff --git a/docs/configuration/interfaces/pppoe.rst b/docs/configuration/interfaces/pppoe.rst
index ae6a8cba..a1537e80 100644
--- a/docs/configuration/interfaces/pppoe.rst
+++ b/docs/configuration/interfaces/pppoe.rst
@@ -177,7 +177,7 @@ PPPoE options
    PPPoE connection must be established over a physical interface. Interfaces
    can be regular Ethernet interfaces, VIFs or bonding interfaces/VIFs.
 
-.. cfgcmd:: set interfaces pppoe <interface> ip adjust-mss <mss>
+.. cfgcmd:: set interfaces pppoe <interface> ip adjust-mss <mss | clamp-mss-to-pmtu>
 
   As Internet wide PMTU discovery rarely works, we sometimes need to clamp our
   TCP MSS value to a specific value. This is a field in the TCP options part of
@@ -190,6 +190,9 @@ PPPoE options
   .. hint:: MSS value = MTU - 20 (IP header) - 20 (TCP header), resulting in
     1452 bytes on a 1492 byte MTU.
 
+Instead of a numberical MSS value `clamp-mss-to-pmtu` can be used to 
+automatically set the proper value.
+
 .. cfgcmd:: set interfaces pppoe <interface> ip disable-forwarding
 
   Configure interface-specific Host/Router behaviour. If set, the interface will
@@ -220,11 +223,7 @@ IPv6
    Use this command to enable acquisition of IPv6 address using stateless
    autoconfig (SLAAC).
 
-.. cmdinclude:: /_include/interface-dhcpv6-prefix-delegation.txt
-  :var0: pppoe
-  :var1: pppoe0
-
-.. cfgcmd:: set interfaces pppoe <interface> ipv6 adjust-mss <mss>
+.. cfgcmd:: set interfaces pppoe <interface> ipv6 adjust-mss <mss | clamp-mss-to-pmtu>
 
   As Internet wide PMTU discovery rarely works, we sometimes need to clamp our
   TCP MSS value to a specific value. This is a field in the TCP options part of
@@ -237,27 +236,17 @@ IPv6
   .. hint:: MSS value = MTU - 20 (IP header) - 20 (TCP header), resulting in
     1452 bytes on a 1492 byte MTU.
 
+Instead of a numberical MSS value `clamp-mss-to-pmtu` can be used to 
+automatically set the proper value.
+
 .. cfgcmd:: set interfaces pppoe <interface> ipv6 disable-forwarding
 
   Configure interface-specific Host/Router behaviour. If set, the interface will
   switch to host mode and IPv6 forwarding will be disabled on this interface.
 
-.. cfgcmd:: set interfaces pppoe <interface> ipv6 source-validation <strict | loose | disable>
-
-  Enable policy for source validation by reversed path, as specified in
-  :rfc:`3704`. Current recommended practice in :rfc:`3704` is to enable strict
-  mode to prevent IP spoofing from DDos attacks. If using asymmetric routing
-  or other complicated routing, then loose mode is recommended.
-
-  - strict: Each incoming packet is tested against the FIB and if the interface
-    is not the best reverse path the packet check will fail. By default failed
-    packets are discarded.
-
-  - loose: Each incoming packet's source address is also tested against the FIB
-    and if the source address is not reachable via any interface the packet
-    check will fail.
-
-  - disable: No source validation
+.. cmdinclude:: /_include/interface-dhcpv6-prefix-delegation.txt
+  :var0: pppoe
+  :var1: pppoe0
 
 *********
 Operation