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[foxium]

A short while ago a "bug" was discovered causing D-link DIR-655 routers to share the same LAN MAC address and from what it looks like this is caused by a defective firmware (details here: http://forums.dlink.com/index.php?topic=10034.msg63334#msg63334).

The exact MAC I got for the two DIR-655 routers I own is 00:03:64:00:01:24. The fact that it's duplicated causes some nasty networking problems  . After searching it seems that 00:03:64:00:01:21, and 00:03:64:00:01:22 are common for D-link routers, and thus it's possible that many of us are sharing the same MAC. According to common sense and D-link's e-mail reply to my support request, MAC addresses should always be unique.

I always buy wifi routers (that are AP capable) in pairs for full wireless coverage, and I've never seen a problem like this with the few brands I had before (not advertising here).

Unlike WAN MAC, which can be easily changed in the config interface, there is no user interface for changing LAN MAC   -- and when one malfunctioning firmware sets it to a non-unique/duplicated one, we are screwed.  

So I thought it would be interesting to find out how many of us here are sharing the same address   .

If you don't know what I'm talking about  , simply open http://192.168.0.1/chklst.txt in your browser (replace 192.168.0.1 with your router's LAN IP) and you'll get something like this:

Firmware Version: ver1.33NAb01
Firmware Date: 2009/12/22
ipVersion(Date): 7.6.1b0156 (2009, Dec 22)
ipOS SDK Version: 7.6.3 P (1134)
WAN MAC: 00:03:64:00:01:23
LAN MAC: 00:03:64:00:01:24
WLAN MAC: 00:1B:11:6D:4C:6E
Wireless Region: 0x04
     SSID: access
SubVendorDeviceID: 0x2071
Wireless Domain: 0x10
Firmware Notify URL: http://wrpd.dlink.com.tw/router/firmware/query.asp?model=DIR-655_AX_NA
Firmware Global URL: http://www.dlink.com.tw
Checksum: 0x03FBE715
Use non DFS channel only: Enabled
This version is Release version
USB_IP/K=Disable
USB_IP/S=Enable Version 1.1.1
WLAN 0 Channel List: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
HW Ver: A1/A2

The line in bold would be the LAN MAC address. Please post back if your address is identical with, or similar to 00:03:64:00:01:24. Thanks!  

[EddieZ]

Just let more people give their MAC.
LAN MAC: 00:1B:11:5E:D5:43

[alien]

lanwireless the same?

LAN MAC: 00:1B:11:E7:1A:2F
WLAN MAC: 00:1B:11:E7:1A:2F

[war59312]

WAN MAC: 00:1b:11:74:3b:49
LAN MAC: 00:1b:11:74:3b:48
WLAN MAC: 00:1b:11:74:3b:48

[Cobra]

Post MACS then other people use MACS (spiders pick them up) then you both compete for IP.

Sounds like fun. 

[EddieZ]

I don't rely on the DIR MAC. 

[foxium]

00:1b:11:xx:xx:xx addresses seem to be the correct ones, as they belong to D-LINK. My 2 routers' original WAN/LAN MAC started with those too.

00:03:64:xx:xx:xx are the ones mistakenly assigned by at least one firmware from D-LINK.

The prefix 000364 belongs to UBICOM instead of D-LINK. My guess is a MAC address was hard coded in one of the UBICOM SDK/DIR-655 firmware, and under a certain circumstance that hard coded MAC address overwrote the correct D-LINK MACs in my routers.