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Activate Host-to-Host Communication (Proxy ARP)
VC-154
Voice, Video, and Home Applications Configuration Guide
Activate Address Resolution Protocol Requests
To activate ARP requests, use the following command in cable interface configuration mode:
Validation Tips
To verify if ARP has been activated, enter the command more system:running-config and look for
the cable interface configuration information. If ARP has been activated, it does not appear in this
output. If ARP has been deactivated, it will appear in the output as no cable arp as shown in this
command output excerpt:
router# more system:running-config
Building configuration...
Current configuration:
!
interface Cable6/0
ip address 1.1.1.1 255.255.255.0
no keepalive
no cable arp
cable insertion-interval 150000
cable downstream annex B
cable downstream modulation 64qam
cable downstream interleave-depth 32
cable downstream symbol-rate 5056941
cable upstream 0 frequency 15008000
cable upstream 0 fec
cable upstream 0 scrambler
no cable upstream 0 shutdown
!
Troubleshooting Tips
If you are having trouble, make sure you entered the correct port and modem card slot number when
you activated ARP and when you entered the show interface cable command.
Activate Host-to-Host Communication (Proxy ARP)
Proxy ARP allows the Cisco uBR7246 to issue ARP requests on behalf of cable modems on the same
cable network subnet.
Note Because the downstream and upstreams are separate interfaces, modems cannot directly
perform ARP with other modems on the cable plant.
Note The default values for the commands used in this configuration task are, in most cases,
adequate to configure the Cisco uBR7246.
Command Purpose
cable arp Enable ARP.