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Chapter 9 - Conguring Firewall/NAT Settings
ASUS SL1200
9 Conguring Firewall/NAT Settings
The router provides built-in rewall/NAT functions. These functions protect
the system against denial of service (DoS) attacks and other types of
malicious accesses to your LAN while providing Internet access sharing at
the same time. You can also specify how to monitor attempted attacks, and
who should be automatically notied.
This chapter describes how to create/modify/delete Access Control List
(ACL) rules to control the data passing through your network. You will use
rewall conguration pages to:
• Create, modify, delete, and view inbound/outbound ACL rules.
• Create, modify, and delete pre-dened services, IP pools, NAT pools,
application lters and time ranges to be used in inbound/outbound
ACL congurations.
• View rewall statistics.
When you define an ACL rule, you instruct the Internet
Security Router to examine each data packet it receives
to determine whether it meets the criteria set in the rule.
The criteria can include the network or internet protocol it is
carrying, the direction in which it is traveling (for example,
from the LAN to the Internet or vice versa), the IP address of
the sending computer, the destination IP address, and other
characteristics of the packet data. If the packet matches
the criteria established in a rule, the packet can either be
accepted (forwarded towards its destination), or denied
(discarded), depending on the action specied in the rule.
9.1 Firewall Overview
9.1.1 Stateful Packet Inspection
The stateful packet inspection engine in the router maintains a state
table that is used to keep track of connection states of all the packets
passing through the firewall. The firewall will open a “hole” to allow the
packet to pass through if the state of the packet that belongs to an already
established connection matches the state maintained by the stateful
- Internet Security Router 1
- Copyright Information 2
- Table of Contents 5
- List of Figures 11
- List of Tables 16
- 1 Introduction 18
- 1.3 Using this Manual 19
- 2.1 Package contents 20
- 2.2 Front Panel 20
- 2.3 Rear Panel 21
- 2.4 Major Features 22
- Chapter 12: ALG Conguration 23
- 2.4.1.5 URL Filtering 25
- 2.4.1.6 Log and Alerts 25
- 2.4.2 VPN 26
- Table 2.4. VPN Features 27
- 3 Quick Start Guide 28
- Chapter 3 - Quick Start Guide 29
- 3.2.1 Before you begin 30
- 3.2.2 Windows 31
- 3.2.3 Windows 31
- 2000 PCs 31
- 3.2.4 Windows 32
- 95, 98, and Me PCs 32
- 3.2.5 Windows 33
- NT 4.0 workstations 33
- To set up the router 36
- 3.3.3 Testing Your Setup 42
- 3.3.4 Default Router Settings 42
- To connect via the LAN ports 44
- Change the Login Password 45
- 4.2 Functional Layout 46
- 5 Conguring LAN Settings 49
- 5.2.1 What is a DHCP? 51
- 5.2.2 Why use a DHCP? 52
- 5.3.1 About DNS 55
- 5.3.2 Assigning DNS Addresses 55
- 5.3.3 Conguring DNS Relay 56
- 5.4 Viewing LAN Statistics 57
- 6 Conguring WAN Settings 58
- 6.2 PPPoE 59
- To congure PPPoE settings 60
- 6.3 Dynamic IP 61
- 6.4 Static IP 62
- 6.5 Viewing WAN Statistics 64
- 7 Conguring Routes 65
- Protocol (RIP) 66
- 7.2.2 Conguring RIP 67
- 7.3 Static Routing 68
- 7.3.2 Adding a Static Route 69
- 7.3.3 Deleting a Static Route 69
- Chapter 7 - Conguring Routes 70
- 8 Conguring DDNS 71
- Chapter 8 - Conguring DDNS 72
- To congure the HTTP DDNS 74
- 9.1 Firewall Overview 75
- 9.2 NAT Overview 77
- 9.2.1 Static (One to One) NAT 78
- 9.2.2 Dynamic NAT 79
- 9.2.4 Reverse Static NAT 81
- (Firewall -> Inbound ACL) 86
- 9.3.3 Add Inbound ACL Rules 86
- To modify an inbound ACL rule 87
- To delete an inbound ACL rule 87
- (Firewall -> Outbound ACL) 92
- 9.4.3 Add Outbound ACL Rules 92
- 9.5 Conguring URL Filters 94
- URL Filter) 95
- 9.5.3 Add URL Filter Rules 95
- 9.5.4 Modify URL Filter Rules 96
- 9.5.5 Delete URL Filter Rules 96
- 9.5.7 URL Filter Rule Example 96
- (Firewall -> Advanced) 97
- 9.6.2 Conguring Service List 100
- Advanced -> Service) 101
- 9.6.2.3 Add a Service 102
- To add a service, follow 102
- 9.6.2.4 Modify a Service 102
- To modify a service 102
- 9.6.3 Conguring DoS Settings 103
- -> DoS) 106
- 9.7.1 Conguring IP Pool 107
- List -> IP Pool) 108
- 9.7.1.3 Add an IP Pool 108
- To add an IP Pool 108
- 9.7.1.4 Modify an IP Pool 109
- To modify an IP Pool 109
- 9.7.1.5 Delete an IP Pool 109
- 9.7.1.6 IP Pool Example 109
- 9.7.2 Conguring NAT Pool 111
- Policy List -> NAT Pool) 112
- 9.7.2.3 Add a NAT Pool 112
- To add a NAT Pool 112
- 9.7.2.4 Modify a NAT Pool 113
- To modify a NAT Pool 113
- 9.7.2.5 Delete a NAT Pool 113
- 9.7.2.6 NAT Pool Example 113
- 9.7.3 Conguring Time Range 115
- Policy List -> Time Range) 116
- 9.7.3.3 Add a Time Range 116
- To add a Time Range 116
- ASUS SL1200 118
- 10 Conguring VPN 120
- Chapter 10 - Conguring VPN 121
- Security Router 122
- 10.3.2 Modify VPN Rules 130
- To modify a VPN rule 130
- 10.3.3 Delete VPN Rules 130
- 10.4 VPN Statistics 131
- 10.5 VPN Connection Examples 133
- Packets on ISR1 136
- 10.5.2.1 Setup the Routers 140
- 11 System Management 147
- 11.4 Setup Date and Time 150
- 11.5 SNMP Setup 151
- To reset system conguration 152
- To reset the router 153
- To backup system conguration 153
- 11.7 Upgrade Firmware 155
- 12 ALG Conguration 158
- Chapter 12 - ALG Conguration 159
- 13.1 IP Addresses 162
- 13.2 Network classes 163
- 13.3 Subnet masks 164
- 14 Troubleshooting 165
- Chapter 14 - Troubleshooting 166
- 14.1.1 ping 168
- 14.1.2 nslookup 169
- 15 Glossary 170
- Chapter 15 - Glossary 171
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