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Diffstat (limited to 'docs/routing/mss-clamp.rst')
| -rw-r--r-- | docs/routing/mss-clamp.rst | 43 |
1 files changed, 0 insertions, 43 deletions
diff --git a/docs/routing/mss-clamp.rst b/docs/routing/mss-clamp.rst deleted file mode 100644 index 923b1338..00000000 --- a/docs/routing/mss-clamp.rst +++ /dev/null @@ -1,43 +0,0 @@ -.. include:: ../_include/need_improvement.txt - -.. _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. Starting with VyOS 1.2 there is a firewall option -to clamp your TCP MSS value for IPv4 and IPv6. - -Clamping can be disabled per interface using the `disable` keyword: - -.. code-block:: none - - set firewall options interface pppoe0 disable - -IPv4 -^^^^ - -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 -^^^^^ - -Clamp outgoing MSS value in a TCP SYN packet to `1280` for both `pppoe0` and -`wg02` interface. - -To achieve the same for IPv6 please use: - -.. code-block:: none - - 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. |