Configuring Proxy Arp In Icx35-Hwc - ProSoft Technology ICX35-HWC User Manual

ICX35-HWC ♦ Industrial Cellular Gateway
3G/4G LTE
When H2 tries to send an IP packet to the S1 server:
1) H2 compares its IP address and subnet mask to the S1 server IP address
(10.2.2.100) and decides that the server is on the same subnet (/8).
2) H2 checks its ARP table to see if there is an entry for 10.2.2.100, if not it will
send an ARP request.
Since the S1 server is not on the 10.1.1.0 /24 subnet, the ICX35-HWC routers do not
forward the broadcast and the ARP request never makes it to the S1 server.
However, when the Proxy ARP is enabled on the ICX35-HWC router:
1) The ICX35-HWC router sees the ARP request from H2 on the 10.1.1.0 /24
subnet and responds with its own MAC address on behalf of destination IP
address.
2) The router sends an ARP reply to H2 with its MAC address on the
FastEthernet (LAN) interface.
3) Once the H2 resolves the MAC via ICX35-HWC router, it can communicate
with the S1 server.

13.2 Configuring Proxy ARP in ICX35-HWC

To configure the Proxy ARP, go to Configuration > Advanced > Proxy ARP.
Note: Proxy ARP cannot be enabled or disabled via Belden Horizon. It can be done only via the ICX35-
HWC UI.
ProSoft Technology, Inc.
Proxy ARP
User Manual
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