6.1.1 Summary .............................................................................................................................. 56
6.1.2 FNT DDNS .......................................................................................................................... 56
6.1.3 CN99
（
www.3322.org
）
.................................................................................................... 56
6.1.4 NO-IP
（
www.no-ip.com
）
................................................................................................. 57
6.1.5 Dyndns DDNS
（
www.dyndns.com
）
................................................................................. 57
6.1.6 Test and verify DDNS .......................................................................................................... 58
6.2 Port Mapping .................................................................................................................................. 58
6.2.1 UPNP Function .................................................................................................................... 59
6.2.2 Manual port mapping ........................................................................................................... 59
6.3 NTP function ................................................................................................................................... 60
6.3.1 Internet configuration ........................................................................................................... 60
6.3.2 Intranet Configuration .......................................................................................................... 60
6.4 PTZ ................................................................................................................................................. 60
6.4.1 PTZ Control ......................................................................................................................... 61
6.5 Voice Intercom ................................................................................................................................ 62
6.5.1 Summarize ........................................................................................................................... 62
6.5.2 Configuration ....................................................................................................................... 62
6.6 HDD Redundancy ........................................................................................................................... 62
6.7 HDD S.M.A.R.T ............................................................................................................................. 63
7 Appendix .................................................................................................................................................... 65
7.1 Terms............................................................................................................................................... 65
7.2 HDD Capacity Calculation ............................................................................................................. 65
7.2.1 Reference of HDD Capacity Calculation ............................................................................. 65
7.2.2 Hard disk problem ................................................................................................................ 66
7.3 Common Faults ............................................................................................................................... 67
