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Diffstat (limited to 'docs/configuration/interfaces/openvpn.rst')
| -rw-r--r-- | docs/configuration/interfaces/openvpn.rst | 59 |
1 files changed, 21 insertions, 38 deletions
diff --git a/docs/configuration/interfaces/openvpn.rst b/docs/configuration/interfaces/openvpn.rst index ed24825b..c0019577 100644 --- a/docs/configuration/interfaces/openvpn.rst +++ b/docs/configuration/interfaces/openvpn.rst @@ -514,28 +514,6 @@ example: } -Offloading (DCO) -================ - -The expression Data Channel Offload refers to any technique implemented with -the goal of moving the processing of data packets from the OpenVPN userspace -program to a separate entity. - -Given that OpenVPN spends a considerable amount of time passing data packets -back and forth from kernel-land to user-land, where decryption and re-routing -happens, it was decided to offload the data processing directly to the kernel. -As direct consequence, data packets are not required to leave the kernelspace -anymore, thus boosting the performance of active VPN connections. - -.. warning:: This is experimental! - -.. cfgcmd:: set interfaces openvpn <name> offload dco - - Enable OpenVPN Data Channel Offload feature by loading the appropriate kernel - module. - - Disabled by default - no kernel module loaded. - ****** Client ****** @@ -627,19 +605,19 @@ Will add ``push "keepalive 1 10"`` to the generated OpenVPN config file. OpenVPN Data Channel Offload (DCO) ********************************** -OpenVPN Data Channel Offload (DCO) enables significant performance -enhancement in encrypted OpenVPN data processing. By minimizing context -switching for each packet, DCO effectively reduces overhead. This optimization -is achieved by keeping most data handling tasks within the kernel, avoiding -frequent switches between kernel and user space for encryption and packet -handling. As a result, the processing of each packet becomes more efficient, -potentially leveraging hardware encryption offloading support available in -the kernel. - -.. note:: OpenVPN DCO is not full OpenVPN features supported , is currently - considered experimental. Furthermore, there are certain OpenVPN features and - use cases that remain incompatible with DCO. To get a comprehensive - understanding of the limitations associated with DCO, refer to the list of +OpenVPN Data Channel Offload (DCO) enables significant performance enhancement +in encrypted OpenVPN data processing. By minimizing context switching for each +packet, DCO effectively reduces overhead. This optimization is achieved by +keeping most data handling tasks within the kernel, avoiding frequent switches +between kernel and user space for encryption and packet handling. + +As a result, the processing of each packet becomes more efficient, potentially +leveraging hardware encryption offloading support available in the kernel. + +.. note:: OpenVPN DCO is not full OpenVPN features supported , is currently + considered experimental. Furthermore, there are certain OpenVPN features and + use cases that remain incompatible with DCO. To get a comprehensive + understanding of the limitations associated with DCO, refer to the list of known limitations in the documentation. https://community.openvpn.net/openvpn/wiki/DataChannelOffload/Features @@ -657,10 +635,15 @@ tunnel configuration where we can enable this function .The current best practice is to create a new tunnel with DCO to minimize the chance of problems with existing clients. -.. cfgcmd:: set interfaces openvpn vtun10 enable-dco +.. cfgcmd:: set interfaces openvpn <name> offload dco + + Enable OpenVPN Data Channel Offload feature by loading the appropriate kernel + module. + + Disabled by default - no kernel module loaded. + + .. note:: Enable this feature causes an interface reset. -Using this command over the interface is performing DCO ,is necessary reset -the tunnel. Troubleshooting =============== |