Netgear Modem FVS318G User Manual Page 77
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- TROUBLESHOOTING
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ProSafe Gigabit 8 Port VPN Firewall FVS318G Reference Manual
Firewall Protection and Content Filtering 4-21
v1.1, August 2010
– Block TCP Flood. A SYN flood is a form of denial of service attack in which an attacker
sends a succession of SYN requests to a target system. When the system responds, the
attacker does not complete the connection, thus saturating the server with half-open
connections. No legitimate connections can then be made.
When blocking is enabled, the VPN firewall will limit the lifetime of partial connections
and will be protected from a SYN flood attack.
• LAN Security Checks
– Block UDP flood. A UDP flood is a form of denial of service attack in which the
attacking machine sends a large number of UDP packets to random ports to the victim
host. As a result, the victim host will check for the application listening at that port, see
that no application is listening at that port, and reply with an ICMP Destination
Unreachable packet.
When the victimized system is flooded, it is forced to send many ICMP packets,
eventually making it unreachable by other clients. The attacker may also spoof the IP
address of the UDP packets, ensuring that the excessive ICMP return packets do not reach
him, making the attacker’s network location anonymous.
If flood checking is enabled, the VPN firewall will not accept more than 20 simultaneous,
active UDP connections from a single computer on the LAN.
– Disable Ping Reply on LAN Ports. To prevent the VPN firewall from responding to ping
requests from the LAN, click this checkbox.
• VPN Pass through. When the VPN firewall functions in NAT mode, all packets going to the
Remote VPN Gateway are first filtered through NAT and then encrypted per the VPN policy.
If a VPN client or gateway on the LAN side of the VPN firewall wants to connect to another
VPN endpoint on the WAN, with the VPN firewall between the two VPN end points, all
encrypted packets will be sent to the VPN firewall. Since the VPN firewall filters the
encrypted packets through NAT, the packets become invalid.
IPsec, PPTP, and L2TP represent different types of VPN tunnels that can pass through the
VPN firewall. To allow the VPN traffic to pass through without filtering, enable those options
for the type of tunnel(s) that will pass through the VPN firewall.
• Multicast Pass through. IGMP is a communications protocol used to manage IP multicast
groups. Checking this option results in IGMP Proxy being enabled for WAN (upstream) and
LAN (downstream) interfaces. If checked, the router will keep track of IGMP group
membership reports from LAN hosts joining and leaving the group. The relevant multicast
traffic will be forwarded from WAN to LAN.
- ProSafe Gigabit 8 Port 1
- VPN Firewall FVS318G 1
- Reference Manual 1
- Additional Copyrights 3
- Contents 7
- About This Manual 13
- How to Print This Manual 14
- Revision History 14
- About This Manual xv 15
- Chapter 1 17
- Introduction 17
- 1-2 Introduction 18
- Security Features 19
- Extensive Protocol Support 20
- Package Contents 21
- 1-6 Introduction 22
- Figure 1-1 22
- Table 1-1. LED Descriptions 22
- Introduction 1-7 23
- Figure 1-2 23
- Qualified Web Browsers 24
- Chapter 2 25
- Logging into the VPN Firewall 26
- Navigating the Menus 27
- Figure 2-2 28
- Figure 2-3 29
- Figure 2-4 30
- Figure 2-5 31
- Figure 2-6 32
- Configuring the WAN Mode 33
- Configuring Dynamic DNS 35
- Figure 2-10 37
- Chapter 3 39
- LAN Configuration 39
- 3-2 LAN Configuration 40
- LAN Configuration 3-3 41
- Figure 3-1 41
- 3-4 LAN Configuration 42
- LAN Configuration 3-5 43
- Creating the Network Database 44
- Viewing the Network Database 45
- 3-8 LAN Configuration 46
- LAN Configuration 3-9 47
- Figure 3-3 47
- 3-10 LAN Configuration 48
- Figure 3-4 48
- LAN Configuration 3-11 49
- 3-12 LAN Configuration 50
- Figure 3-5 50
- LAN Configuration 3-13 51
- Configuring Static Routes 52
- LAN Configuration 3-15 53
- Figure 3-6 53
- Figure 3-7 53
- Static Route Example 54
- LAN Configuration 3-17 55
- Figure 3-8 55
- 3-18 LAN Configuration 56
- Chapter 4 57
- Services-Based Rules 59
- ., or an address range 62
- Figure 4-1 64
- Configuring LAN WAN Rules 65
- Figure 4-2 66
- Figure 4-3 67
- Configuring DMZ WAN Rules 68
- Configuring LAN DMZ Rules 69
- Figure 4-6 70
- Figure 4-7 70
- Inbound Rules Examples 71
- Figure 4-9 72
- Figure 4-10 73
- Outbound Rules Example 75
- Attack Checks 76
- Setting Session Limits 78
- Figure 4-15 79
- Adding Customized Services 80
- Figure 4-16 81
- Figure 4-17 82
- Creating Bandwidth Profiles 83
- Figure 4-18 84
- Figure 4-19 84
- Figure 4-20 86
- To enable Content Filtering: 88
- Figure 4-22 90
- Figure 4-23 92
- Configuring Port Triggering 93
- Figure 4-24 94
- Figure 4-25 95
- Figure 4-26 96
- Figure 4-27 96
- Administrator Tips 98
- Chapter 5 99
- Virtual Private Networking 99
- Figure 5-1 100
- Figure 5-2 100
- Figure 5-3 102
- Figure 5-4 102
- Figure 5-5 103
- Figure 5-6 104
- Figure 5-7 105
- Figure 5-8 105
- Figure 5-9 106
- Figure 5-10 107
- Figure 5-11 108
- Figure 5-12 109
- Figure 5-13 110
- Figure 5-14 110
- Figure 5-15 111
- Table 5-1 111
- Figure 5-16 112
- Managing VPN Policies 113
- Figure 5-18 114
- Figure 5-19 116
- Configuring VPN Policies 121
- Figure 5-20 122
- Figure 5-21 124
- Managing Certificates 128
- Figure 5-22 131
- Figure 5-23 132
- Figure 5-24 132
- Figure 5-25 133
- Figure 5-26 134
- Figure 5-27 135
- Figure 5-28 136
- Figure 5-29 138
- Figure 5-30 139
- Figure 5-31 141
- Mode Config Operation 142
- Figure 5-32 143
- Figure 5-33 144
- Recommended settings are: 146
- • Encryption Algorithm: 3DES 146
- • Diffie-Hellman: Group 2 146
- • SA Lifetime: 3600 seconds 146
- Figure 5-35 148
- Figure 5-36 149
- Figure 5-37 150
- Figure 5-38 150
- Configuring Keepalives 151
- Figure 5-39 152
- Figure 5-40 153
- Figure 5-41 154
- Chapter 6 155
- Management 162
- Figure 6-1 163
- Adding External Users 164
- Figure 6-4 166
- Figure 6-5 168
- Using an SNMP Manager 170
- Figure 6-6 171
- Figure 6-7 172
- Figure 6-8 173
- Figure 6-9 176
- Monitoring System Performance 177
- Figure 6-10 178
- Viewing the Logs 180
- Enabling the Traffic Meter 181
- Figure 6-12 182
- Figure 6-13 183
- Figure 6-14 184
- Figure 6-15 185
- Figure 6-16 186
- Monitoring Attached Devices 187
- Figure 6-18 188
- Viewing the VPN Logs 189
- Viewing the DHCP Log 190
- Chapter 7 193
- Troubleshooting 193
- Power LED Not On 194
- LEDs Never Turn Off 194
- Troubleshooting 7-3 195
- 7-4 Troubleshooting 196
- Troubleshooting 7-5 197
- Problems with Date and Time 199
- 7-8 Troubleshooting 200
- Figure 7-1 200
- Troubleshooting 7-9 201
- Table 7-1. Diagnostics 201
- 7-10 Troubleshooting 202
- Appendix A 203
- Appendix B 207
- Two Factor Authentication 207
- B-2 Two Factor Authentication 208
- Two Factor Authentication B-3 209
- Figure B-1 209
- Figure B-2 209
- B-4 Two Factor Authentication 210
- Figure B-3 210
- Appendix C 211
- Related Documents 211
- C-2 Related Documents 212
- Numerics 213
- Index-10 222
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