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OfficeConnect VPN Firewall User’s Manual Chapter 14. Configuring IPSec VPN
67
Field
Description
Windows OS are vulnerable to this attack. If the computers in
the LAN are not updated with recent versions/patches, you are
advised to enable this protection by checking this check box.
TCP/UDP/ICM
P Port Scan
Check or un-check this option to enable or disable protection
against such attacks. A UDP flood is a form of denial of service
attack that can be initiated when one machine sends a large
number of UDP packets to random ports on a remote host. As
a result, the distant host will (1) check for the application
listening at that port, (2) see that no application is listening at
that port and (3) 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, thus making the attacker’s
etwork location anonymous.
IP Spoofing
Check or un-check this option to enable or disable protection
against such attacks. IP spoofing is one of the most common
forms of on-line camouflage. In IP spoofing, an attacker gains
unauthorized access to a computer or a network by making it
appear that a malicious message has come from a trusted
machine by ―spoofing‖ the IP address of that machine.
Ping of Death
Check or un-check this option to enable or disable protection
against such attacks. A ping of death is a type of attack on a
Field
Description
computer that involves sending a malformed or otherwise
malicious ping to a computer. A ping is normally 64 bytes in
size (or 84 bytes when IP header is considered); many
computer systems cannot handle a ping larger than the
maximum IP packet size, which is 65,535 bytes. Sending a
ping of this size can crash the target computer.
LAND Attack
Check or un-check this option to enable or disable protection
against such attacks. A LAND attack is a DoS (Denial of
Service) attack that consists of sending a special poison
spoofed packet to a computer, causing it to lock up.
Echo Chargen
TearDrop
Check or un-check this option to enable or disable protection
against such attacks. A Teardrop attack involves sending
mangled IP fragments with overlapping, over-sized, payloads
to the target machine. A bug in the TCP/IP fragmentation re-
assembly code of various operating systems caused the
fragments to be improperly handled, crashing them as a result
of this.[4] Windows 3.1x, Windows 95 and Windows NT
operating systems, as well as versions of Linux prior to
versions 2.0.32 and 2.1.63 are vulnerable to this attack.
TCP
XMAS/NULL/S
YNFIN Scan
Check or un-check this option to enable or disable protection
against such attacks. During a normal TCP connection, the
source initiates the connection by sending a SYN packet to a
port on the destination system. If a service is listening on that
port, the service responds with a SYN/ACK packet. The client
- OfficeConnect 1
- Introduction 3
- List of Tables 12
- 1 Introduction 14
- 1.3.3 Special messages 15
- 2 Getting to Know the 17
- 2.4 Major Features 18
- 2.4.2 VPN 20
- 3 Quick Start Guide 23
- 3.3.1 Before you begin 26
- 3.3.2 Windows® XP PCs: 26
- 3.3.3 Windows® 2000 PCs: 26
- 3.4.2 Testing Your Setup 32
- 4 Getting Started with the 35
- 5 Configuring LAN Settings 39
- 5.2.1 What is DHCP? 40
- 5.2.2 Why use DHCP? 41
- just go to the DHCP Server 43
- 5.4 DNS 44
- 5.6 Viewing LAN Statistics 46
- 6 Configuring VLAN Settings 47
- 7 Configuring Spanning Tree 49
- 8 Configuring WAN Settings 53
- 8.3 PPTP 54
- 8.4 Dynamic IP 55
- 8.5 Static IP 56
- 8.6 Viewing WAN Statistics 57
- 9 Configuring Routes 59
- 9.3 Static Routing 60
- 9.3.2 Adding Static Routes 61
- 10 Configuring DDNS 63
- 11 Configuring Firewall/NAT 65
- 11.2 NAT Overview 66
- 11.2.3 Reverse Static NAT 67
- Enable Web 74
- Content Filter 74
- 11.6.2.3 Add a Service 79
- 11.6.2.4 Modify a Service 80
- 11.6.2.5 Delete a Service 80
- 11.6.4 Configuring Schedule 82
- 11.6.4.3 Add a Schedule 83
- 11.6.4.4 Schedule Example 84
- Policies table 85
- 12.1 Overview 89
- 13 Configuring WAN Load 93
- 14 Configuring IPSec VPN 97
- 14.2.2 Modify VPN Rules 101
- 14.2.3 Delete VPN Rules 101
- 14.2.4 Display VPN Rules 101
- 14.3.2 Modify VPN Rules 102
- 14.3.3 Delete VPN Rules 102
- 14.3.4 Display VPN Rules 103
- 2 (ISR2) 105
- 15 Configuring L2TP Server 109
- 16 Configuring PPTP Server 111
- 17 System Management 115
- 17.5 Setup Date and Time 118
- 17.7 Upgrade Firmware 119
- 17.10 Configuring Logging 120
- 17.11 Configuring SNMP 121
- 18 ALG Configuration 123
- IP Addresses, Network Masks 125
- 19.3 Subnet masks 126
- 20 Troubleshooting 129
- 20.1.1 ping 130
- 20.1.2 nslookup 131
- 21 SAFETY INFORMATION 133
- 22 OBTAINING SUPPORT FOR 135
- Contact Us 136
- 23 END USER SOFTWARE 143
- 24 Regulatory Notices 144
- 25 Glossary 145
- 26 Index 151
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