Re: UDP Broadcast traffic?

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.hrabi@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 ?




.

Relevant Pages

  • Re: UDP Broadcast traffic?
    ... thought is that there may be another connection between the two networks. ... But without a router, not sure how the traffic would bridge the two subnets. ... Allen-Bradley PLC. ...
    (comp.dcom.sys.cisco)
  • Re: UDP Broadcast traffic?
    ... The only multicast traffic that Ethereal is picking up is coming ... from a single device behind the router. ... Allen-Bradley PLC. ...
    (comp.dcom.sys.cisco)