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CLI-based Configuration Guide - Security

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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Service Is Interrupted After IPSG Is Enabled on the Upstream Interface

Service Is Interrupted After IPSG Is Enabled on the Upstream Interface

Fault Description

After IPSG is enabled on an interface, all hosts on the interface cannot access the Internet. Service on the hosts is abnormal.


  1. Check whether IPSG has been enabled on an upstream interface.

    Generally, IPSG is enabled on the user-side interface, namely, the downstream interface. If IPSG is enabled on the upstream interface, the packets returned by the gateway may be discarded. As a result, user service is interrupted.

    As shown in Figure 14-16, after static binding entries are configured on the router for Host_1 and Host_2 and IPSG is enabled on IF1, IF2, and IF3, the hosts cannot access the Internet, but they can communicate with each other. Host_1 is used as an example here to describe the fault symptom:
    • Host_1 sends a packet to the Internet. When the packet reaches IF1 of the router, the router detects that the packet matches a binding entry, and forwards it.
    • The Internet returns a packet to Host_1. When the packet reaches IF3, the router detects that the packet does not match any binding entry, and discards the packet.
    Figure 14-16  Service is interrupted after IPSG is enabled on the upstream interface

  2. Procedure.
    1. Run the display ip source check user-bind interface interface-type interface-number command to check whether IPSG is enabled on the upstream interface IF3.
    2. If "ip source check user-bind enable" is displayed, IPSG has been enabled on the upstream interface. Run the undo ip source check user-bind enable command in the interface view to disable IPSG on upstream interface IF3.
Updated: 2019-08-07

Document ID: EDOC1100034077

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