ZyXEL UAG4100 User Guide - Page 189
Virtual Interfaces
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Chapter 10 Interfaces Table 79 Configuration > Network > Interface > Bridge > Edit (continued) LABEL Description Connectivity Check Enable Connectivity Check Check Method DESCRIPTION Enter a description to help identify this static DHCP entry. You can use alphanumeric and characters, and it can be up to 60 characters long. The interface can regularly check the connection to the gateway you specified to make sure it is still available. You specify how often the interface checks the connection, how long to wait for a response before the attempt is a failure, and how many consecutive failures are required before the UAG stops routing to the gateway. The UAG resumes routing to the gateway the first time the gateway passes the connectivity check. Select this to turn on the connection check. Select the method that the gateway allows. Select icmp to have the UAG regularly ping the gateway you specify to make sure it is still available. Check Period Check Timeout Check Fail Tolerance Check Default Gateway Check this address Check Port Related Setting Configure WAN TRUNK Configure Policy Route OK Cancel Select tcp to have the UAG regularly perform a TCP handshake with the gateway you specify to make sure it is still available. Enter the number of seconds between connection check attempts. Enter the number of seconds to wait for a response before the attempt is a failure. Enter the number of consecutive failures before the UAG stops routing through the gateway. Select this to use the default gateway for the connectivity check. Select this to specify a domain name or IP address for the connectivity check. Enter that domain name or IP address in the field next to it. This field only displays when you set the Check Method to tcp. Specify the port number to use for a TCP connectivity check. Click WAN TRUNK to go to a screen where you can configure the interface as part of a WAN trunk for load balancing. Click Policy Route to go to the screen where you can manually configure a policy route to associate traffic with this bridge interface. Click OK to save your changes back to the UAG. Click Cancel to exit this screen without saving. 10.7 Virtual Interfaces Use virtual interfaces to tell the UAG where to route packets. Virtual interfaces can be created on top of Ethernet interfaces, VLAN interfaces, or bridge interfaces. Virtual VLAN interfaces recognize and use the same VLAN ID. Otherwise, there is no difference between each type of virtual interface. Network policies (for example, security policy control rules) that apply to the underlying interface automatically apply to the virtual interface as well. Like other interfaces, virtual interfaces have an IP address, subnet mask, and gateway used to make routing decisions. However, you have to manually specify the IP address and subnet mask; virtual interfaces cannot be DHCP clients. Like other interfaces, you can restrict bandwidth through virtual interfaces, but you cannot change the MTU. The virtual interface uses the same MTU that the UAG Series User's Guide 189