User`s manual

User’s Manual
Arctic GPRS Router 26 Viola Systems Ltd.
GRE
GRE tunnel enabled - When set to "Yes", Arctic establish automatically GRE connection
Interface - Interface used to reach the GRE server
GRE server IP - IP address of GRE server
Gw to GRE server* (ethernet mode) - If other gateway than default route is needed to reach
the GRE server
Local GRE interface IP (usually eth0 IP) - Local IP used in GRE tunnel
Remote GRE interface IP* - Remote IP used in GRE tunnel
TTL value - Time-to-live value for the interface
Checksum* - checksum value
Incoming key* - authentication key
Outgoing key* - Outgoing key for the server
Routing
Routing mode – same as in SSH-VPN and L2TP
Remote network* - same as in SSH-VPN and L2TP
Remote network mask* - same as in SSH-VPN and L2TP
* these are optional, please refer to your GRE server documentation
Monitor
Monitor is used for GPRS and VPN connection checking. If connection to the selected IP
address is lost, the connection is restarted. Monitor uses ICMP echo (ping) packets to check
the connection. The monitor also keeps the connection alive, so that idle timeout do not drop
the connections.
ICMP Echo sending – Selects if the monitor is enabled. This should be always enabled to
correct IP.
Interval (sec) – Determines how often the connection is checked by sending ICMP echo
packets. The interval should be smaller than GPRS idle timeout (typically max. 2/3 of GPRS
idle timeout) in order to have uninterrupted communication.
Reply timeout (secs) – The waiting time for reply packets.
Retries timeout (secs) – The number of tries before connections are restarted.
Target IP address – The host IP address to which echo packets are sent to.
Secondary target IP address – The secondary host IP address to which ICMP echo packets
are to be sent if the sending to primary target host IP address fails.
Note: Monitor must be always enabled. When VPN is used, remote VPN peer IP (or other IP
reached only via VPN) must be used for connection checking