PROXY ARP

chenhui · Created Aug 21, 2019 02:47:26

@RamiroP hello,
the IP address of interface Ethernet0/0/0 and Ethernet0/0/1 are in different network segments, the ARP request will discarded by router 1.

The ARP proxy function takes effect in the following conditions: The destination IP address of the ARP request packet and the IP address of the inbound interface do not reside on the same network segment, but the device has an available route to the destination IP address, and the inbound and outbound interfaces of the route are different. In this case, the device uses its MAC address as the source to reply to the ARP request.

chenhui · Created Aug 21, 2019 02:47:26

@RamiroP hello,
the IP address of interface Ethernet0/0/0 and Ethernet0/0/1 are in different network segments, the ARP request will discarded by router 1.

The ARP proxy function takes effect in the following conditions: The destination IP address of the ARP request packet and the IP address of the inbound interface do not reside on the same network segment, but the device has an available route to the destination IP address, and the inbound and outbound interfaces of the route are different. In this case, the device uses its MAC address as the source to reply to the ARP request.

RamiroP · Created Aug 21, 2019 11:43:33

Hello chenhui,

Thank you for your answer

"The ARP proxy function takes effect in the following conditions: The destination IP address of the ARP request packet and the IP address of the inbound interface do not reside on the same network segment, but the device has an available route to the destination IP address, and the inbound and outbound interfaces of the route are different."

This is exactly the scenario i have described. The router1 is directly connected to both networks.

Router1:

eth0/0/0 - IP 192.168.100.1/24

eth0/0/1 - IP 192.168.200.1/24

I have a PC2 connected to eth0/0/0 but it is using an IP address of eth0/0/1 (192.168.200.2/24)

So router1 has proxy-arp enabled on eth0/0/0 and an static route for that hosts trough eth0/0/0.

[Router1]dis ip routing-table 192.168.200.2

Route Flags: R - relay, D - download to fib

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

Routing Table : Public

Summary Count : 1

Destination/Mask Proto Pre Cost Flags NextHop Interface

192.168.200.2/32 Static 60 0 D 192.168.100.1 Ethernet0/0/0

[Router1]dis curr int Ethernet 0/0/0

#

interface Ethernet0/0/0

ip address 192.168.100.1 255.255.255.0

arp-proxy enable

Regards,

Ramiro.

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chenhui · Created Aug 22, 2019 02:23:37

Posted by RamiroP at 2019-08-21 11:43 Hello chenhui,Thank you for your answer"The ARP proxy function takes effect in the following conditi ...

hi,
the PC2 and interface e0/0/0 are not in the same network segment, the source address and destination address of the arp request packet send by the PC2 is 192.168.200.2 and 192.168.200.1, these arp request packet wouldnt' be answered by the router. I think this example could help you http://support.huawei.com/hedex/hdx.do?docid=EDOC1000163385&id=dc_cfg_arp_1022&text=Configuring%252520Routed%252520Proxy%252520ARP&lang=en

RamiroP · Created Aug 22, 2019 11:29:37

Hello Chenhui

Ok, thanks. It does not work as we expect (it is different to Cisco´s proxy arp).

Problem is our clients usually move from one interface to another of the router (when the last mile moves to a remote place) but we cannot change their ip address.. today we acomplish this by using proxy-arp and static /32 route on cisco router.

We are planning upgrading our PE routers, and we were thinking using Huawei but we cant if we dont get this to work.

Regards,
Ramiro.

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