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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Configuring Routed Proxy ARP

Configuring Routed Proxy ARP

Context

If hosts on the same network segment but different physical networks need to communicate while the gateways connecting to these hosts have different addresses, you need to enable routed proxy ARP on the switch interface connecting to the hosts.

As shown in Figure 2-9, the IP address of Host A is 10.10.10.1/16 and that of Host B is 10.10.11.1/16, and Host A and Host B are located on the same network segment. The Switch connects to two networks through VLANIF 10 and VLANIF 20. The IP addresses of VLANIF 10 and VLANIF 20 are located on different network segments. The IP addresses of Host A and Host B are on the same network segment. When Host A needs to communicate with Host B, Host A broadcasts an ARP Request packet, requesting the MAC address of Host B. However, Host A and Host B are on different physical networks (in different broadcast domains). Host B cannot receive the ARP Request packet sent from Host A and does not respond with an ARP Reply packet.
Figure 2-9 Routed proxy ARP implementation

You can enable routed proxy ARP on VLANIF 10 and VLANIF 20 of the Switch to solve this problem.

IP addresses of the STAservers on a subnet have the same network ID. Therefore, the default gateway address does not need to be configured on the STAservers.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

    NOTE:

    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  4. Run ip address ip-address { mask | mask-length }

    IP addresses are configured for interfaces.

    The IP address configured for the interface enabled with routed proxy ARP must be on the same network segment as the IP address of the connected server on a LAN.

  5. Run arp proxy enable

    Routed proxy ARP is enabled on the interface.

    By default, routed proxy ARP is disabled on an interface.

    After proxy ARP is enabled, the aging time of ARP entries on servers should be shortened so that invalid ARP entries can be deleted as soon as possible. The number of packets received but cannot be forwarded by the device is decreased.

  6. Run commit

    The configuration is committed.

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Updated: 2019-04-18

Document ID: EDOC1100039535

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