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-rw-r--r--docs/configuration/firewall/index.rst14
1 files changed, 10 insertions, 4 deletions
diff --git a/docs/configuration/firewall/index.rst b/docs/configuration/firewall/index.rst
index 8a90e7fa..c2e584a3 100644
--- a/docs/configuration/firewall/index.rst
+++ b/docs/configuration/firewall/index.rst
@@ -812,10 +812,13 @@ IPv4
.. cfgcmd:: set firewall options interface <interface> adjust-mss
- <number-of-bytes>
+ <mss | clamp-mss-to-pmtu>
Use this command to set the maximum segment size for IPv4 transit
- packets on a specific interface (500-1460 bytes).
+ packets on a specific interface (536-65535 bytes).
+
+ Instead of a numerical MSS value `clamp-mss-to-pmtu` can be used to
+ automatically set the proper value.
Example
-------
@@ -835,10 +838,13 @@ IPv6
====
.. cfgcmd:: set firewall options interface <interface> adjust-mss6
- <number-of-bytes>
+ <mss | clamp-mss-to-pmtu>
Use this command to set the maximum segment size for IPv6 transit
- packets on a specific interface (1280-1492 bytes).
+ packets on a specific interface (1220-65535 bytes).
+
+ Instead of a numerical MSS value `clamp-mss-to-pmtu` can be used to
+ automatically set the proper value.
.. _firewall:ipv6_example: