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proxy arp without gateway

Hi,

I want to setup this one :

PC ( 10.0.1.110/24 Gw:10.0.1.231 )  ->   Ge0/1 - Cisco 1921 -  Ge0/0 -> Industrial Ethernet module ( 84.0.1.7/24 Gw:blank or 0.0.0.0 )

It is not possible to add gateway to the Industrial Ethernet module (84.0.1.7), so i use proxy-arp on interfaces in my cisco router 1921 :

--------------------------

-------------------------------------------------------
no ipv6 cef
ip source-route
ip gratuitous-arps
ip cef
!
!
interface GigabitEthernet0/0
ip address 84.0.1.231 255.255.255.0

ip proxy-arp

!
interface GigabitEthernet0/1
ip address 10.0.1.231 255.255.255.0

ip proxy-arp

!
no ip forward-protocol nd

---------------------------------------------------------------------------------

It is not working.  Am I missing something?

Thanks.
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