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Diffstat (limited to 'docs/configuration/interfaces/pppoe.rst')
| -rw-r--r-- | docs/configuration/interfaces/pppoe.rst | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/docs/configuration/interfaces/pppoe.rst b/docs/configuration/interfaces/pppoe.rst index 74a43bb5..b37e95a2 100644 --- a/docs/configuration/interfaces/pppoe.rst +++ b/docs/configuration/interfaces/pppoe.rst @@ -143,6 +143,19 @@ PPPoE options set interfaces pppoe pppoe0 default-route-distance 220 +.. cfgcmd:: set interfaces pppoe <interface> mru <mru> + + Set the :abbr:`MRU (Maximum Receive Unit)` to `mru`. PPPd will ask the peer to + send packets of no more than `mru` bytes. The value of `mru` must be between 128 + and 16384. + + A value of 296 works well on very slow links (40 bytes for TCP/IP header + 256 + bytes of data). + + The default is 1492. + + .. note:: When using the IPv6 protocol, MRU must be at least 1280 bytes. + .. cfgcmd:: set interfaces pppoe <interface> idle-timeout <time> Use this command to set the idle timeout interval to be used with on-demand @@ -245,8 +258,8 @@ IPv6 .. note:: This command was introduced in VyOS 1.4 - it was previously called: ``set firewall options interface <name> adjust-mss <value>`` - .. hint:: MSS value = MTU - 20 (IP header) - 20 (TCP header), resulting in - 1452 bytes on a 1492 byte MTU. + .. hint:: MSS value = MTU - 40 (IPv6 header) - 20 (TCP header), resulting in + 1432 bytes on a 1492 byte MTU. Instead of a numerical MSS value `clamp-mss-to-pmtu` can be used to automatically set the proper value. |