ICP DAS USA GRP-520 User Manual page 58

GRP-520 User Manual, V1.30, Aug. 2015
(4) Enable "3G/GPRS Reconnection" function to keep your 3G/GPRS network always online
(usually, ISP will disconnect your connection once every 1~3 days).
Generally, you can set the Server IP as your server's IP or google's DNS server IP
(8.8.8.8). If you use MDVPN, please set the Server IP as your Server IP that doesn't deny
ICMP service (Ping).
Press "Modify" after you finish all settings.
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