ZyXEL ZyWALL ATP700 User Guide - Page 886
I cannot get the application patrol to manage H.323 traffic.
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Chapter 43 Troubleshooting • Make sure you recorded your DDNS account's user name, password, and domain name and have entered them properly in the Zyxel Device. • You may need to configure the DDNS entry's IP Address setting to Auto if the interface has a dynamic IP address or there are one or more NAT routers between the Zyxel Device and the DDNS server. • The Zyxel Device may not determine the proper IP address if there is an HTTP proxy server between the Zyxel Device and the DDNS server. I cannot create a second HTTP redirect rule for an incoming interface. You can configure up to one HTTP redirect rule for each (incoming) interface. I cannot get the application patrol to manage SIP traffic. Make sure you have the SIP ALG enabled. I cannot get the application patrol to manage H.323 traffic. Make sure you have the H.323 ALG enabled. I cannot get the application patrol to manage FTP traffic. Make sure you have the FTP ALG enabled. The Zyxel Device keeps resetting the connection. If an alternate gateway on the LAN has an IP address in the same subnet as the Zyxel Device's LAN IP address, return traffic may not go through the Zyxel Device. This is called an asymmetrical or "triangle" route. This causes the Zyxel Device to reset the connection, as the connection has not been acknowledged. You can set the Zyxel Device's security policy to permit the use of asymmetrical route topology on the network (so it does not reset the connection) although this is not recommended since allowing asymmetrical routes may let traffic from the WAN go directly to the LAN without passing through the Zyxel Device. A better solution is to use virtual interfaces to put the Zyxel Device and the backup gateway on separate subnets. See Asymmetrical Routes on page 518 and the chapter about interfaces for more information. ZyWALL ATP Series User's Guide 886
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