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-.. _routing-mss-clamp:
-
-################
-TCP-MSS Clamping
-################
-
-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 a SYN packet. By setting the MSS value, you are telling
-the remote side unequivocally 'do not try to send me packets bigger than
-this value'.
-
-Starting with VyOS 1.2 there is a firewall option to clamp your TCP MSS
-value for IPv4 and IPv6.
-
-
-.. note:: MSS value = MTU - 20 (IP header) - 20 (TCP header), resulting
-   in 1452 bytes on a 1492 byte MTU.
-
-
-IPv4
-====
-
-.. cfgcmd:: set firewall options interface <interface> adjust-mss <number-of-bytes>
-
-   Use this command to set the maximum segment size for IPv4 transit
-   packets on a specific interface (500-1460 bytes).
-
-Example
--------
-
-Clamp outgoing MSS value in a TCP SYN packet to `1452` for `pppoe0` and
-`1372`
-for your WireGuard `wg02` tunnel.
-
-.. code-block:: none
-
-  set firewall options interface pppoe0 adjust-mss '1452'
-  set firewall options interface wg02 adjust-mss '1372'
-
-IPv6
-====
-
-.. cfgcmd:: set firewall options interface <interface> adjust-mss6 <number-of-bytes>
-
-   Use this command to set the maximum segment size for IPv6 transit
-   packets on a specific interface (1280-1492 bytes).
-
-Example
--------
-
-Clamp outgoing MSS value in a TCP SYN packet to `1280` for both `pppoe0` and
-`wg02` interface.
-
-.. code-block:: none
-
-  set firewall options interface pppoe0 adjust-mss6 '1280'
-  set firewall options interface wg02 adjust-mss6 '1280'
-
-
-
-.. hint:: When doing your byte calculations, you might find useful this
-   `Visual packet size calculator <https://baturin.org/tools/encapcalc/>`_.