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7.6.7 Port Scan Prevention ....................................................................................................................... 79

7.7 Routing ..................................................................................................................................................... 80

7.7.1 Static Routes .................................................................................................................................... 80

7.7.2 Dynamic Routes ............................................................................................................................... 81

7.8 Load Balancing ......................................................................................................................................... 84

8 Services ........................................................................................................................................................ 85

8.1 VRRP ......................................................................................................................................................... 85

8.1.1 VRRP LAN Configuration Settings .................................................................................................... 85

8.1.2 Check Internet connection ............................................................................................................... 85

8.2 TR-069 ...................................................................................................................................................... 86

8.2.1 TR-069 Parameters Configuration ................................................................................................... 86

8.3 Web filter ................................................................................................................................................. 86

8.3.1 Site blocking ..................................................................................................................................... 86

8.3.2 Proxy Based Content Blocker ........................................................................................................... 87

8.4 NTP ........................................................................................................................................................... 88

8.5 RS232/RS485 ............................................................................................................................................ 89

8.5.1 RS232 ............................................................................................................................................... 89

8.5.2 RS485 ............................................................................................................................................... 91

8.5.3 Modes of different serial types in RS232 and RS485 ....................................................................... 94

8.6 VPN .......................................................................................................................................................... 98

8.6.1 OpenVPN .......................................................................................................................................... 98

8.6.2 IPSec ............................................................................................................................................... 100

8.6.3 GRE Tunnel ..................................................................................................................................... 103

8.6.4 PPTP ............................................................................................................................................... 105

8.6.5 L2TP ................................................................................................................................................ 106

8.7 Dynamic DNS .......................................................................................................................................... 107

8.8 SMS Utilities ........................................................................................................................................... 108

8.8.1 SMS Utilities ................................................................................................................................... 108

8.8.2 Call Utilities .................................................................................................................................... 115

8.8.3 User Groups ................................................................................................................................... 115

8.8.4 SMS Management .......................................................................................................................... 116

8.8.5 Remote Configuration .................................................................................................................... 118

8.8.6 Statistics ......................................................................................................................................... 121

8.9 SNMP ..................................................................................................................................................... 121

8.9.1 SNMP Settings ................................................................................................................................ 121