Event ID 8003 - Master Browser issue

Chicago Area Laptop for rent: $35 per day plus $10 for additional day

Case Study - Even ID 8003 - The master browser has received a server announcement from the computer <computer name> that believes that it is the master browser for the domain on transport <Card #>.

Situation: The client has a master browser recently. The DC keeps receive Even ID 8003 - The master browser has received a server announcement from the computer <computer name> that believes that it is the master browser for the domain on transport <Card #>.

Troubleshooting: The computer that announces itself as Master Browser is changed randomly. But all of them are local in one office. After used ipconfig /all command on all problem computers, we found all these computers used different DHCP. Here are the comparison of ipconfig results on regular computers and problem computers.

The regular computer ipconfig:

IP Address. . . . . . . . . . . . : 10.0.0.25

Subnet Mask . . . . . . . . . . . : 255.255.0.0

Default Gateway . . . . . . . . . : 10.0.0.2

DHCP Server . . . . . . . . . . . . : 10.0.0.9

The problem computer ipconfig:

IP Address. . . . . . . . . . . . : 10.0.0.125

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 10.0.0.121

DHCP Server . . . . . . . . . . . . : 10.0.0.121

Using arp command (see below), we found that the MAC address is 00-11-24-6a-f3-f1. From the MAC address, we believed there is a Apple device was setup as a DHCP in the same subnet.

arp -a 10.0.0.121

Interface: 10.0.0.125--- 0x2

Internet Address Physical Address Type

10.0.0.121 00-11-24-6a-f3-f1 dynamic

The client told us they just added a Apple Airport wireless router to the LAN. After we disabled DHCP on the Airport router, they don't receive 8003 Event ID any more.