Interface Technical Reference - ZyXEL Communications ISG50-ISDN User Manual

Integrated service gateway

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Table of Contents

Chapter 12 Interfaces

Table 79 Virtual Interface Add (continued)

12.8 Interface Technical Reference

Here is more detailed information about interfaces on the ISG50.

IP Address Assignment

Most interfaces have an IP address and a subnet mask. This information is used to create an entry

in the routing table.

Figure 187 Example: Entry in the Routing Table Derived from Interfaces

Table 80 Example: Routing Table Entries for Interfaces

IP ADDRESS(ES)

100.100.1.1/16

200.200.200.1/24

For example, if the ISG50 gets a packet with a destination address of 100.100.25.25, it routes the

packet to interface lan1. If the ISG50 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.

This is reserved for future use.

Enter the maximum amount of traffic, in kilobits per second, the ISG50 can receive

from the network through the interface. Allowed values are 0 - 1048576.

Click OK to save your changes back to the ISG50.

Click Cancel to exit this screen without saving.

ISG50 User's Guide