ZyXEL ZYWALL USG 100 User Guide - Page 64

Chapter 4 Create Secure Connections Across the Internet

ZyWALL USG100-PLUS User’s Guide

64

4.1.3

What Can Go Wrong

If the IPSec tunnel does not build properly, the problem is likely a configuration error at one of the

IPSec routers. Log into both IPSec routers and check the settings in each field methodically and

slowly. Make sure both the ZyWALL and remote IPSec router have the same security settings for

the VPN tunnel. It may help to display the settings for both routers side-by-side.

Here are some general suggestions.

•

The system log can often help to identify a configuration problem.

•

If you enable NAT traversal, the remote IPSec device must also have NAT traversal enabled.

•

Both routers must use the same authentication method to establish the IKE SA.

•

Both routers must use the same negotiation mode, encryption algorithm, authentication

algorithm, and DH key group.

•

When using manual keys, both routers must use the same encryption key and authentication

key.

•

When using pre-shared keys, both routers must use the same pre-shared key.

•

The ZyWALL’s local and peer ID type and content must match the remote IPSec router’s peer and

local ID type and content, respectively.

•

Both routers must use the same active protocol, encapsulation, and SPI.

•

If the sites are/were previously connected using a leased line or ISDN router, physically

disconnect these devices from the network before testing your new VPN connection. The old

route may have been learnt by RIP and would take priority over the new VPN connection.

•

To test whether or not a tunnel is working, ping from a computer at one site to a computer at the

other.

Before doing so, ensure that both computers have Internet access (via the IPSec routers).

•

It is also helpful to have a way to look at the packets that are being sent and received by the

ZyWALL and remote IPSec router (for example, by using a packet analyzer such as Wireshark).

Check the configuration for the following ZyWALL features.

•

The ZyWALL does not put IPSec SAs in the routing table. You must create a policy route for each

VPN tunnel.

•

Make sure the To-ZyWALL firewall rules allow IPSec VPN traffic to the ZyWALL. IKE uses UDP port

500, AH uses IP protocol 51, and ESP uses IP protocol 50.

•

The ZyWALL supports UDP port 500 and UDP port 4500 for NAT traversal. If you enable this,

make sure the To-ZyWALL firewall rules allow UDP port 4500 too.

•

Make sure regular firewall rules allow traffic between the VPN tunnel and the rest of the network.

Regular firewall rules check packets the ZyWALL sends before the ZyWALL encrypts them and

check packets the ZyWALL receives after the ZyWALL decrypts them. This depends on the zone

to which you assign the VPN tunnel and the zone from which and to which traffic may be routed.

•

If you set up a VPN tunnel across the Internet, make sure your ISP supports AH or ESP

(whichever you are using).

•

If you have the ZyWALL and remote IPSec router use certificates to authenticate each other, You

must set up the certificates for the ZyWALL and remote IPSec router first and make sure they

trust each other’s certificates. If the ZyWALL’s certificate is self-signed, import it into the remote

IPsec router. If it is signed by a CA, make sure the remote IPsec router trusts that CA. The

ZyWALL uses one of its

Trusted Certificates

to authenticate the remote IPSec router’s

certificate. The trusted certificate can be the remote IPSec router’s self-signed certificate or that

of a trusted CA that signed the remote IPSec router’s certificate.

Section	Page
ZyWALL USG100-PLUS	1
Videos	2
Contents	3
Introduction	5
1.1 Overview	5
1.2 Default Zones, Interfaces, and Ports	7
1.3 Management Overview	7
1.4 Web Configurator	8
1.4.1 Web Configurator Access	9
1.4.2 Web Configurator Introduction Video	10
1.4.3 Web Configurator Screens Overview	11
1.4.4 Navigation Panel	11
1.4.5 Tables and Lists	16
1.5 Stopping the ZyWALL	19
1.6 Rack-mounting	19
1.7 Front Panel	20
1.7.1 Front Panel LEDs	20
How to Set Up Your Network	21
2.1 Wizard Overview	21
2.2 How to Configure Interfaces, Port Roles, and Zones	21
2.2.1 Configure a WAN Ethernet Interface	22
2.2.2 Configure Port Roles	23
2.2.3 Configure Zones	23
2.3 How to Configure a Cellular Interface	24
2.4 How to Configure Ethernet, PPP, VLAN, Bridge and Policy Routing	26
2.5 How to Set Up IPv6 Interfaces For Pure IPv6 Routing	27
2.5.1 Setting Up the WAN IPv6 Interface	27
2.5.2 Setting Up the LAN Interface	28
2.5.3 Pure IPv6 Routing Video Example	29
2.5.4 Prefix Delegation and Router Advertisement Settings	29
2.5.5 Test	32
2.5.6 Prefix Delegation and Router Advertisement Settings Video Example	33
2.5.7 What Can Go Wrong?	34
2.6 How to Set Up an IPv6 6to4 Tunnel	34
2.6.1 Configuration Concept	34
2.6.2 Setting Up the LAN IPv6 Interface	35
2.6.3 Setting Up the 6to4 Tunnel	36
2.6.4 Testing the 6to4 Tunnel	36
2.6.5 Set Up an IPv6 6to4 Tunnel Video Example	37
2.6.6 What Can Go Wrong?	37
2.7 How to Set Up an IPv6-in-IPv4 Tunnel	38
2.7.1 Configuration Concept	38
2.7.2 Setting Up the IPv6-in-IPv4 Tunnel	38
2.7.3 Setting Up the LAN IPv6 Interface	39
2.7.4 Setting Up the Policy Route	40
2.7.5 Testing the IPv6-in-IPv4 Tunnel	41
2.7.6 Set Up an IPv6-in-IPv4 Tunnel Video Example	42
2.7.7 What Can Go Wrong?	42
Protecting Your Network	45
3.1 Firewall	45
3.1.1 What Can Go Wrong	46
3.2 User-aware Access Control	46
3.2.1 What Can Go Wrong	46
3.3 Endpoint Security (EPS)	47
3.3.1 What Can Go Wrong	47
3.4 Device and Service Registration	47
3.5 Anti-Virus Policy Configuration	48
3.5.1 What Can Go Wrong	49
3.6 IDP Profile Configuration	50
3.6.1 Procedure To Create a New Profile	50
3.7 ADP Profile Configuration	51
3.7.1 Procedure To Create a New ADP Profile	51
3.8 Content Filter Profile Configuration	54
3.8.1 Content Filtering Video Example	56
3.9 Viewing Content Filter Reports	56
3.10 Anti-Spam Policy Configuration	60
Create Secure Connections Across the Internet	63
4.1 IPSec VPN	63
4.1.1 Test the VPN Connection	63
4.1.2 Configure Security Policies for the VPN Tunnel	63
4.1.3 What Can Go Wrong	64
4.2 VPN Concentrator Example	65
4.2.1 What Can Go Wrong	67
4.3 Hub-and-spoke IPSec VPN Without VPN Concentrator	67
4.3.1 What Can Go Wrong	68
4.4 ZyWALL IPSec VPN Client Configuration Provisioning	69
4.4.1 Overview of What to Do	69
4.4.2 Configuration Steps	70
4.4.3 ZyWALL IPSec VPN Client Configuration Provisioning Video Example	72
4.4.4 What Can Go Wrong	72
4.5 SSL VPN	73
4.5.1 SSL VPN Video Example	74
4.5.2 What Can Go Wrong	74
4.6 L2TP VPN with Android, iOS, and Windows	75
4.6.1 L2TP VPN Example	75
4.6.2 Configuring Policy Routing	77
4.6.3 Configuring L2TP VPN on the ZyWALL Video Example	80
4.6.4 Configuring L2TP VPN in Android	80
4.6.5 Configuring L2TP VPN in iOS	81
4.6.6 Configuring L2TP VPN in Windows	81
4.6.7 What Can Go Wrong	90
4.7 One-Time Password Version 2 (OTPv2)	90
4.7.1 What Can Go Wrong	91
Managing Traffic	93
5.1 How to Configure Bandwidth Management	93
5.1.1 Bandwidth Allocation Example	94
5.1.2 Setting the Interface’s Bandwidth	94
5.1.3 SIP Bandwidth Management	94
5.1.4 SIP Any-to-WAN and WAN-to-Any Bandwidth Management Example	94
5.1.5 HTTP Any-to-WAN Bandwidth Management Example	95
5.1.6 FTP WAN-to-DMZ Bandwidth Management Example	97
5.1.7 FTP LAN-to-DMZ Bandwidth Management Example	98
5.1.8 Bandwidth Management Video Example	100
5.1.9 What Can Go Wrong?	100
5.2 How to Configure a Trunk for WAN Load Balancing	100
5.2.1 Set Up Available Bandwidth on Ethernet Interfaces	101
5.2.2 Configure the WAN Trunk	102
5.3 How to Use Multiple Static Public WAN IP Addresses for LAN-to-WAN Traffic	103
5.3.1 Create the Public IP Address Range Object	103
5.3.2 Configure the Policy Route	104
5.4 How to Configure DNS Inbound Load Balancing	104
5.4.1 What Can Go Wrong?	105
5.5 How to Allow Public Access to a Web Server	106
5.5.1 Configure NAT	106
5.5.2 Set Up a Firewall Rule	107
5.5.3 What Can Go Wrong	108
5.6 How to Manage Voice Traffic	108
5.6.1 How to Allow Incoming H.323 Peer-to-peer Calls	108
5.6.2 How to Use an IPPBX on the DMZ	110
5.6.3 What Can Go Wrong	112
5.7 How to Limit Web Surfing and MSN to Specific People	113
5.7.1 Set Up Web Surfing Policies	113
5.7.2 Set Up MSN Policies	114
5.7.3 AppPatrol Video Example	117
5.7.4 What Can Go Wrong	117
Maintenance	119
6.1 How to Allow Management Service from WAN	119
6.1.1 Check Service Control	119
6.1.2 Check Firewall Settings	120
6.2 How to Use a RADIUS Server to Authenticate User Accounts based on Groups	122
6.3 How to Use SSH for Secure Telnet Access	123
6.3.1 Example 1: Microsoft Windows	123
6.3.2 Example 2: Linux	124
6.4 How to Manage ZyWALL Configuration Files	124
6.4.1 What Can Go Wrong	125
6.5 How to Manage ZyWALL Firmware	125
6.5.1 What Can Go Wrong	126
6.6 How to Download and Upload a Shell Script	126
6.6.1 What Can Go Wrong	127
6.7 How to Save System Logs to a USB Storage Device	127
6.7.1 What Can Go Wrong?	130
6.8 How to Get the ZyWALL’s Diagnostic File	130
6.9 How to Capture Packets on the ZyWALL	131
6.9.1 Example of Viewing a Packet Capture (CAP) File	133
6.10 How to Get the ZyWALL’s Core Dump File	134
6.11 How to Use Packet Flow Explore for Troubleshooting	135

ZyXEL ZYWALL USG 100 User Guide - Page 64

What Can Go Wrong, Trusted Certificates - manual

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