Digi TransPort WR31 User Manual page 466

Configure Virtual Private Networking (VPN)
OpenVPN TX ping interval (seconds)
Interval between OpenVPN ping transmissions. These are required to detect the operational
state of the VPN connection.
OpenVPN RX ping timeout (seconds)
The number of seconds, after which no OpenVPN ping has been received, the VPN will be
marked as down.
Include IV
Enabling this option on includes an IV at the head of an encrypted packet. If one peer prepends
this IV and the other isn't expecting it, packet decryption will fail.
Key negotiation timeout (seconds)
Maximum time, in seconds, to allow for a data channel key negotiation.
Key renegotiation interval (seconds)
Interval between key re-negotiations.
Key renegotiation bytes
If non-zero, a key renegotiation will take place after this many bytes have traveled through the
data channel in either direction.
Key renegotiation packets
If non-zero, a key renegotiation will take place after this many packets have traveled through the
data channel.
Inactivity timeout (seconds)
The tunnel is disconnected after the tunnel becomes inactive (that is, no IP traffic) for this many
seconds. Note that the timer is only restarted with RX traffic, not TX traffic.
Data channel cipher
Sets the cipher for data channel encryption/decryption. Select from the dropdown list.
Data channel digest
Sets the digest algorithm for data channel authentication. Select from the dropdown list.
Debug
Enables output of OVPN related debug.
Digi TransPort WR Routers User Guide
OpenVPN parameters
466