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11.7.1
Main Mode Remote Access.................................................................... 118
11.7.2
Aggressive Mode Remote Access ......................................................... 120
12 System Management........................... 123
12.1
Configure System Services ............................................................................... 123
12.2
Change the Login Password ............................................................................. 124
12.3
Modify System Information ................................................................................ 124
12.4
Setup Date and Time ......................................................................................... 125
12.4.1
View the System Date and Time ............................................................ 126
12.5
System Configuration Management ................................................................. 126
12.5.1
Reset System Configuration ................................................................... 126
12.5.2
Backup System Configuration ................................................................ 127
12.5.3
Restore System Configuration................................................................ 127
12.6
Upgrade Firmware.............................................................................................. 128
12.7
Reset the Internet Security Router.................................................................... 129
12.8
Logout Configuration Manager.......................................................................... 130
13 ALG Configuration................................ 131
14 IP Addresses, Network Masks, and
Subnets ................................................ 135
14.1
IP Addresses ...................................................................................................... 135
14.1.1
Structure of an IP address....................................................................... 135
14.2
Network classes ................................................................................................. 135
14.3
Subnet masks..................................................................................................... 136
15 Troubleshooting.................................... 139
15.1
Diagnosing Problem using IP Utilities ............................................................... 140
15.1.1
ping ........................................................................................................... 140
15.1.2
nslookup ................................................................................................... 141
16 Glossary ............................................... 143