Security Considerations; Figure 139 Block Vpn To Vpn Traffic By Default Example - ZyXEL Communications ZYWALL 35 User Manual

Chapter 11 Firewall

Figure 139 Block VPN to VPN Traffic by Default Example

11.4 Security Considerations

Incorrectly configuring the firewall may block valid access or introduce security
risks to the ZyWALL and your protected network. Use caution when creating or
deleting firewall rules and test your rules after you configure them.
Consider these security ramifications before creating a rule:
1 Does this rule stop LAN users from accessing critical resources on the Internet? For
example, if IRC is blocked, are there users that require this service?
2 Is it possible to modify the rule to be more specific? For example, if IRC is blocked for
all users, will a rule that blocks just certain users be more effective?
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ZyWALL 5/35/70 Series User's Guide