Re: UDP Broadcast traffic?

On 17 Aug, 16:12, "Joe" <jwdueh...@xxxxxxxxx> wrote:
Merv,
Answers to your questions:

Do you have devices on BOTH subnets that are generating this multicast
traffic ??

Negative. The only multicast traffic that Ethereal is picking up is coming
from a single device behind the router.

How do you know that this multicast traffic is passing thru the router ?

Because the source address (per Ethereal) is from a known IP address behind
the router.

TW UDP port 2222 is an unregistered Allen-Bradley UDP port.

Correct. The traffic is coming from an IP address assigned to an
Allen-Bradley PLC. The production engineers are using the multicast traffic
for diagnostics between some PLCs. I want to block it from coming through
the router on to the rest of the network.

Hope these answers help.

Thanks,
Joe

"Merv" <merv.hr...@xxxxxxxxxx> wrote in message

news:1187198157.430867.151990@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx





TW UDP port 2222 is an unregistered Allen-Bradley UDP port.

Do you have PLC controllers connected to this network ?- Hide quoted text -

- Show quoted text -

Well, you seem to have it all sorted out,

Follow Merv's advice and use an access-list to
block this specific traffic.

Report back.

Good luck - you may need it.

.

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