ALM-303046944 Gateway Conflict

Description

SECE/4/GATEWAY_CONFLICT:OID=[OID] Gateway conflict.(SourceInterface=[OCTET], SourceIP=[OCTET], SourceMAC=[OCTET], PVLAN=[INTEGER], CVLAN=[INTEGER])

The system detects attack packets whose source IP addresses are the same as the gateway IP address.

Only the AC6605 supports this alarm.

Attribute

Alarm ID	Alarm Severity	Alarm Type
303046944	Warning	equipmentAlarm

Parameters

Name	Meaning
OID	Indicates the MIB object ID of the alarm.
SourceInterface	Indicates the source interface of packets.
SourceIP	Indicates the source IP address of packets.
SourceMAC	Indicates the source MAC address of packets.
PVLAN	Indicates the outer VLAN ID of packets.
CVLAN	Indicates the inner VLAN ID of packets.

Impact on the System

If this alarm is generated, the user gateway information may be modified by an attacker. As a result, the user is attacked and user services are interrupted.

Possible Causes

The device is attacked by packets whose source IP address is the same as the gateway IP address.

Procedure

Find the interface where the gateway conflict occurs according to the value of SourceInterface.
Lock the user who sends gateway conflict packets according to the values of SourceMAC and PVLAN.
Check whether the allocated address of the user conflicts with the gateway address. If the address conflicts, allocate an address to the user again. If the address does not conflict, the user may be the attacker. In this case, you can take such measures as disconnecting the user.