ZyXEL UAG715 User Guide - Page 138

Table 53, IP ADDRESSES, DESTINATION, Table 54

Page 138 highlights

Chapter 8 Interfaces Figure 91 Example: Entry in the Routing Table Derived from Interfaces Table 53 Example: Routing Table Entries for Interfaces IP ADDRESS(ES) DESTINATION 100.100.1.1/16 lan1 200.200.200.1/24 wan1 For example, if the UAG gets a packet with a destination address of 100.100.25.25, it routes the packet to interface lan1. If the UAG gets a packet with a destination address of 200.200.200.200, it routes the packet to interface wan1. In most interfaces, you can enter the IP address and subnet mask manually. In PPPoE/PPTP interfaces, however, the subnet mask is always 255.255.255.255 because it is a point-to-point interface. For these interfaces, you can only enter the IP address. In many interfaces, you can also let the IP address and subnet mask be assigned by an external DHCP server on the network. In this case, the interface is a DHCP client. Virtual interfaces, however, cannot be DHCP clients. You have to assign the IP address and subnet mask manually. In general, the IP address and subnet mask of each interface should not overlap, though it is possible for this to happen with DHCP clients. In the example above, if the UAG gets a packet with a destination address of 5.5.5.5, it might not find any entries in the routing table. In this case, the packet is dropped. However, if there is a default router to which the UAG should send this packet, you can specify it as a gateway in one of the interfaces. For example, if there is a default router at 200.200.200.100, you can create a gateway at 200.200.200.100 on ge2. In this case, the UAG creates the following entry in the routing table. Table 54 Example: Routing Table Entry for a Gateway IP ADDRESS(ES) DESTINATION 0.0.0.0/0 200.200.200.100 The gateway is an optional setting for each interface. If there is more than one gateway, the UAG uses the gateway with the lowest metric, or cost. If two or more gateways have the same metric, the UAG uses the one that was set up first (the first entry in the routing table). In PPPoE/PPTP interfaces, the other computer is the gateway for the interface by default. In this case, you should specify the metric. If the interface gets its IP address and subnet mask from a DHCP server, the DHCP server also specifies the gateway, if any. 138 UAG715 User's Guide

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Chapter 8 Interfaces
UAG715 User’s Guide
138
Figure 91
Example: Entry in the Routing Table Derived from Interfaces
For example, if the UAG gets a packet with a destination address of 100.100.25.25, it routes the
packet to interface lan1. If the UAG gets a packet with a destination address of 200.200.200.200, it
routes the packet to interface wan1.
In most interfaces, you can enter the IP address and subnet mask manually. In PPPoE/PPTP
interfaces, however, the subnet mask is always 255.255.255.255 because it is a point-to-point
interface. For these interfaces, you can only enter the IP address.
In many interfaces, you can also let the IP address and subnet mask be assigned by an external
DHCP server on the network. In this case, the interface is a DHCP client. Virtual interfaces,
however, cannot be DHCP clients. You have to assign the IP address and subnet mask manually.
In general, the IP address and subnet mask of each interface should not overlap, though it is
possible for this to happen with DHCP clients.
In the example above, if the UAG gets a packet with a destination address of 5.5.5.5, it might not
find any entries in the routing table. In this case, the packet is dropped. However, if there is a
default router to which the UAG should send this packet, you can specify it as a gateway in one of
the interfaces. For example, if there is a default router at 200.200.200.100, you can create a
gateway at 200.200.200.100 on ge2. In this case, the UAG creates the following entry in the
routing table.
The gateway is an optional setting for each interface. If there is more than one gateway, the UAG
uses the gateway with the lowest metric, or cost. If two or more gateways have the same metric,
the UAG uses the one that was set up first (the first entry in the routing table). In PPPoE/PPTP
interfaces, the other computer is the gateway for the interface by default. In this case, you should
specify the metric.
If the interface gets its IP address and subnet mask from a DHCP server, the DHCP server also
specifies the gateway, if any.
Table 53
Example: Routing Table Entries for Interfaces
IP ADDRESS(ES)
DESTINATION
100.100.1.1/16
lan1
200.200.200.1/24
wan1
Table 54
Example: Routing Table Entry for a Gateway
IP ADDRESS(ES)
DESTINATION
0.0.0.0/0
200.200.200.100