Configuration Guide Configuring Web Authentication
When ARP check or similar functions are enabled, the ARP learning performed by clients is controlled. As a result, clients
cannot learn the ARPs of the gateway and other devices, which affects user experience. You can configure the
straight-through ARP resource range to permit the ARP learning packets destined for the specified address to pass.
Notes
 When ARP check is enabled, you need to configure the gateway of the PCs connecting to the Layer-2 access device as
a straight-through ARP resource. Note the following point when you perform the configuration:
1. When you configure straight-through websites and ARP resources in the same address or network segment, the
http redirect direct-arp command automatically combines the websites and ARP resources. If no ARP option is
specified for the configured websites, an ARP option will be automatically added after the combination.
 When ARP check is enabled, if the outbound addresses of the PCs connecting to the Layer-2 access device are not the
gateway address, configure the outbound addresses as straight-through ARP resources. If multiple outbound
addresses exist, configure these addresses as straight-through ARP resources.
Configuration Steps
 Optional.
 If ARP check is enabled on the NAS, you must configure the free resources and gateway address as straight-through
ARP resources.
Verification
 Configure straight-through ARP resources.
 Clear the ARP cache of the PC of an unauthenticated user. (Run the arp -d command in the Windows operating
system.)
 Run the ping command on the PC to access the straight-through ARP resources.
 View the ARP cache on the PC (run the arp -a command in the Windows operating system) and check whether the PC
learns the ARP address of the straight-through ARP resources.
Related Commands
 Configuring the Straight-Through ARP Resource Range
http redirect direct-arp {ip-address [ip-mask] }
ip-address: Indicates the IP address of free resources.
ip-mask: Indicates the mask of free resources.
Global configuration mode
Configuration Example
 Configuring the Straight-Through ARP Resource
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