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Feature request: Some way to deal with WiFi client sending proxy arp #32

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mmchu opened this issue Jan 15, 2021 · 3 comments
Open

Feature request: Some way to deal with WiFi client sending proxy arp #32

mmchu opened this issue Jan 15, 2021 · 3 comments
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@pucherot
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enhancement New feature or request

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@mmchu
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mmchu commented Jan 15, 2021

I have 1 device which is an Ethernet device and in order to connect it to my network, I have a portable Zyxel Wifi client bridging Wifi to Ethernet for it.

This causes an interesting problem since it (the Zyxel Wifi client) is proxy arping for Ethernet-only device it is bridging for.

The result is that you see the Zyxel's MAC address regularly flip between its own IP address (used for web management) and that of the Ethernet-only device.

Not too sure how to solve this. Maybe a way to indicate that a particular MAC address belong to WiFi client proxy arping?
@pucherot
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interesting, I will study the way to differentiate two devices.

Do you have pi.hole installed?
Are the IP addresses of the Ethernet device and the Zyxel Wifi client within the same LAN as the raspberry?
Are using both the pi.hole DHCP server?

@pucherot pucherot self-assigned this Jan 17, 2021
@pucherot pucherot added enhancement New feature or request help Doubts question Further information is requested and removed help Doubts labels Jan 17, 2021
@mmchu
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mmchu commented Jan 19, 2021

Pihole is installed but it is not offering DHCP addresses. This is because I also have a Firewalla Blue installed on my network in DHCP mode which means it must be the one offering up DHCP addresses.

The IP address of the Ethernet device (in this case it is a Juicebox EV charger) is different from the Zyxel Wifi client.

I think the Zyxel is just preventing ARP requests (not sure about what happens when the Juicebox broadcasts) from making it through.

I suspect, from Pi.Alert's perspective, there might not be much you can do about not being able to see MAC address of the devices behind another device doing proxy arp.

At best it would be to flag this situation so that it doesn't report that the IP address is changing?

@pucherot pucherot removed the question Further information is requested label Feb 2, 2021
@towster
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towster commented May 16, 2022

I have same issue on my network. Wireless bridge device shows up as changing IP to the devices on the bridge.

How do we prevent pi-alert from flagging the IP changing on this type of device?

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@towster @mmchu @pucherot