Technical data

4. Packages
This start an OpenVPN tunnel running in background. Instead of name.conf use the
name of your configuration file in directory /etc/openvpn.
OPENVPN_DEFAULT_VERBOSE Default: OPENVPN_DEFAULT_VERBOSE=’2’
This variable sets the verbosity of OpenVPN. If a VPN connection is running flawlessly
you can set this to ’0’ to avoid all messages. For testing purposes a value of ’3’ is
adviced. Higher values may be useful for debugging. Maximum value is ’11’.
OPENVPN_DEFAULT_MANAGEMENT_LOG_CACHE Default:
OPENVPN_DEFAULT_MANAGEMENT_LOG_CACHE=’100’
This value controls how many log lines should be saved. Logs can be reviewed in the
WebGUI (Page 177).
OPENVPN_DEFAULT_MUTE_REPLAY_WARNINGS Default:
OPENVPN_DEFAULT_MUTE_REPLAY_WARNINGS=’no’
This variable controls if a warning is posted to the log when receiving double packet for
this could point out security problems in a network. When using poor WLAN connections
doubled packets may occur rather often. In this case it makes sense to switch the warning
off to avoid flooding logfiles. This setting has no impact on the security of an OpenVPN
connection.
OPENVPN_DEFAULT_MSSFIX Default: OPENVPN_DEFAULT_MSSFIX=”
Setting MSSFIX defines the size of TCP packets for the VPN connection.
OPENVPN_DEFAULT_MSSFIX=’0’ disables this option. If fragment sizes are given and MSS-
FIX entry is empty fragment sizes will be used automatically. This setting only works
with OPENVPN_x_PROTOCOL=’udp’.
OPENVPN_DEFAULT_FRAGMENT Default: OPENVPN_DEFAULT_FRAGMENT=’1300’
Activates internal fragmentation of OpenVPN packets with a size of x bytes. This setting
only works with OPENVPN_x_PROTOCOL=’udp’.
OPENVPN_DEFAULT_FRAGMENT=’0’ completely deactivates fragmentation.
OPENVPN_DEFAULT_TUN_MTU Default: OPENVPN_DEFAULT_TUN_MTU=’1500’
Sets the MTU of the virtual OpenVPN adapter to x bytes. Only change this setting if if
you know what you’re doing! Usually it is more reasonable to try fragment or MSSFIX
options at first.
OPENVPN_DEFAULT_TUN_MTU_EXTRA Default: OPENVPN_DEFAULT_TUN_MTU_EXTRA=”
If OPENVPN_x_PROTOCOL=’bridge’ is set 32 bytes will be reserved as extra memory for
managing the buffers for the tap device. With OPENVPN_x_PROTOCOL=’tunnel’ no extra
memory is reserved. This only affects the memory footprint in the router and has no
influence on the amount of data sent over the tunnel.
OPENVPN_DEFAULT_LINK_MTU Default: OPENVPN_DEFAULT_LINK_MTU=”
Sets the MTU of an OpenVPN connection to x bytes. Only use this setting if if you know
what you’re doing! Usually it is more reasonable to try fragment or MSSFIX options at
first.
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