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Chapter 19 Firewall
ZyWALL USG 100/200 Series User’s Guide
338
Firewall and VPN Traffic
After you create a VPN tunnel and add it to a zone, you can set the firewall rules applied to
VPN traffic. If you add a VPN tunnel to an existing zone (the LAN1 zone for example), you
can configure a new LAN to LAN firewall rule or use intra-zone traffic blocking to allow or
block VPN traffic transmitting between the VPN tunnel and other interfaces in the LAN zone.
If you add the VPN tunnel to a new zone (the VPN zone for example), you can configure rules
for VPN traffic between the VPN zone and other zones or From VPN To-ZyWALL rules for
VPN traffic destined for the ZyWALL.
Finding Out More
• See Section 5.4.12 on page 117 for related information on the Firewall screens.
• See Section 6.5.6 on page 153 for an example of creating firewall rules as part of
configuring user-aware access control (Section 6.5 on page 148).
• See Section 6.8.3 on page 161 for an example of creating a firewall rule to allow H.323
traffic from the WAN to LAN1.
19.1.3 Firewall Rule Example Applications
Suppose that your company decides to block all of the LAN users from using IRC (Internet
Relay Chat) through the Internet. To do this, you would configure a LAN1 to WAN firewall
rule that blocks IRC traffic from any source IP address from going to any destination address.
You do not need to specify a schedule since you need the firewall rule to always be in effect.
The following figure shows the results of this rule.
Figure 238 Blocking All LAN to WAN IRC Traffic Example
Your firewall would have the following configuration.
• The first row blocks LAN1 access to the IRC service on the WAN.
Table 110 Blocking All LAN1 to WAN IRC Traffic Example
# USER SOURCE DESTINATION SCHEDULE SERVICE ACTION
1 Any Any Any Any IRC Deny
Default Any Any Any Any Any Allow