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Browser Service Windows 2003 and port flooding

When I run a network sniffer i get several of the following errors

Source: 192.201.0.16 (PC)
Destination: 192.201.0.63 (Switch)
Protocol: Browser
Info: Domain/Workgroup announcement <my domain controller name>

Source: 192.201.0.16
Destination: 192.201.0.63
Protocol: NBNS
info: name query, nb_illegal nescon(00)

Question: My domain controller is on a 192.203.x.x network
How does the 192.201.x.x network know of the domain controllers existence

The PC whose address is 192.201.0.16 has a second NIC which is on the 192.203.x.x network

Question 1: How do I stop my domain controller from broadcasting to other subnets that are physically separate (no VLAN's configured, but each network has its own switches with no routers to other switches)?

Question 2: If I have hardcoded ip addresses how can i stop my dns from broadcasting? Should I use WINS on top of DNS? There are 12 PC's connected to the domain controller. I want to stop browser elections and browsing? If browsing stops are there any negative effects?

I also have problems where computers added to the domain take longer to ping the domain controller then computers on the same subnet that aren't added to the domain.

I am using layer 2 switches

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Justin Owens

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adimit

ASKER

forgive me but I am not sure of what you mean by UDP on port 137? I'm not an expert. The sniffer just told me that the brotocol is nbns and browser.

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Justin Owens

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adimit

ASKER

when you say server do you mean my domain controller? My main concern is that a pc on one network knows about a domain controller on another. That's the problem i am trying to solve. I want to make sure that traffic for each physical lan doesn't go to another lan. no vlans are used. all networks are wired separately.

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Justin Owens

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adimit

ASKER

most pc's have two network cards. each network card goes to a different switch. aren't the different subnets suppose to separate traffic?

adimit

ASKER

I believe the information is correct, but I was hoping for an answer to my last question because I equate a subnet to a vlan to a broadcast domain and I am a little confused. I also expect that switches on physically different networks are the equivalent of a vlan.