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-rw-r--r--docs/routing/mss-clamp.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/routing/mss-clamp.rst b/docs/routing/mss-clamp.rst
index f61aa956..9409690a 100644
--- a/docs/routing/mss-clamp.rst
+++ b/docs/routing/mss-clamp.rst
@@ -37,3 +37,5 @@ To achieve the same for IPv6 please use:
set firewall options interface pppoe0 adjust-mss6 '1280'
set firewall options interface wg02 adjust-mss6 '1280'
+.. note:: MSS value = MTU - 20 (IP header) - 20 (TCP header), resulting in 1452
+ bytes on a 1492 byte MTU.