MAC address conflict


#1

Our Balance 380 with 6.2.2 firmware began seeing multiple messages like this today. It happened several times. The internet provider does not see anything wrong.

The MAC shown is the WAN2 of the router. That is the WAN in use for this internet provider. The IP shown is the correct one for that WAN. There are no devices between the fiber modem, and WAN2.

48:34 the router flags the WAN as down due to DNS test

48:39 the router flags an address conflict. *(How would it show a MAC conflict with its own MAC address, while the WAN was disconnected?)
*
49:14 the WAN is reconnected

49:19 the same MAC conflict (the MAC shown is the device’s own MAC, so how can there be a conflict?)

Two hours later we had the exact same scenario. The router and connections have been installed for years with no issues before today.

[TABLE=“class: stat_table, width: 748”]
[TR=“class: zb1”]
Oct 27 14:49:19
MAC address conflict: Received an ARP packet claiming to be from our MAC address 00:11:6E:01:7F:E2, but with an unknown IP (xx.159.215.22)
[/TR]
[TR=“class: zb2, bgcolor: #E6E6E6”]
Oct 27 14:49:14
WAN: Fiber connected (xx.159.215.22)
[/TR]
[TR=“class: zb1”]
Oct 27 14:48:39
MAC address conflict: Received an ARP packet claiming to be from our MAC address 00:11:6E:01:7F:E2, but with an unknown IP (xx.159.215.22)
[/TR]
[TR=“class: zb2, bgcolor: #E6E6E6”]
Oct 27 14:48:34
WAN: Fiber disconnected (WAN failed DNS test)
[/TR]
[/TABLE]


#2

Please help to open ticket and enable Remote Assistance for us to take closer look.

Thank you.


#3

The WAN port is connected to a fiber to ethernet media converter. We rebooted the converter and this problem went away. Sometimes ctrl-alt-delete fixes the problem.


#4

Hi Don,

Thanks for the sharing!

Anyway, can you elaborate more on the “ctrl-alt-delete fixes the problem”?


#5

I was kidding. ctrl-alt-delete is the key sequence to force any Windows computer to reboot.


#6

:):):):):slight_smile: Support life


#7

Hi Sit Loong,

I 'm facing with this issue. Is it related with anomaly traffic that can be affect on the HA of peplink?


#8

@rokhyui

Found you have opened a support ticket regarding to the events logs. We will follow up with you using support ticket


#9

Hi Sifu, Thanks for assist


#10

lol - :joy:
When all else fails…read the manual / reboot / get a bigger hammer