Инструкция для ZYXEL NXC5200

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Chapter 11 Interfaces

NXC5200 User’s Guide

195

• Egress bandwidth sets the amount of traffic the NXC sends out through the

interface to the network.

• Ingress bandwidth sets the amount of traffic the NXC allows in through the

interface from the network.

If you set the bandwidth restrictions very high, you effectively remove the
restrictions.

The NXC also restricts the size of each data packet. The maximum number of
bytes in each packet is called the maximum transmission unit (MTU). If a packet is
larger than the MTU, the NXC divides it into smaller fragments. Each fragment is
sent separately, and the original packet is re-assembled later. The smaller the
MTU, the more fragments sent, and the more work required to re-assemble
packets correctly. On the other hand, some communication channels, such as
Ethernet over ATM, might not be able to handle large data packets.

DHCP Settings

Dynamic Host Configuration Protocol (DHCP, RFC 2131, RFC 2132) provides a way
to automatically set up and maintain IP addresses, subnet masks, gateways, and
some network information (such as the IP addresses of DNS servers) on
computers in the network. This reduces the amount of manual configuration you
have to do and usually uses available IP addresses more efficiently.

In DHCP, every network has at least one DHCP server. When a computer (a DHCP
client) joins the network, it submits a DHCP request. The DHCP servers get the
request; assign an IP address; and provide the IP address, subnet mask, gateway,
and available network information to the DHCP client. When the DHCP client
leaves the network, the DHCP servers can assign its IP address to another DHCP
client.

In the NXC, some interfaces can provide DHCP services to the network. In this
case, the interface can be a DHCP relay or a DHCP server.

As a DHCP relay, the interface routes DHCP requests to DHCP servers on different
networks. You can specify more than one DHCP server. If you do, the interface
routes DHCP requests to all of them. It is possible for an interface to be a DHCP
relay and a DHCP client simultaneously.

As a DHCP server, the interface provides the following information to DHCP clients.

At the time of writing, the NXC does not support ingress bandwidth management.