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UDP/RTP Flooding Problem.

J

jaw4322

n00b
Joined
May 26, 2010
Messages
58
I've got a weird network issue i was hoping someone here to clear up for me. I have a 5 or so unicast RTP/UDP ip streams that I capture on a PC. Streams are sent directly to my pc via static unicast IP. The problem is if the PC gets turned off and/or restarted, the network seems to gets flooded. Its as if when there is no longer a valid endpoint, the network no longer knows what to do with the streams and floods the network. Is there a way in the switch (Dlink) or router to stop this from happening. Any help is greatly appreciated.
 
That's pretty much how a network works. If a device tries to send a frame to a device, and the switch doesn't know which port it belongs out of; it has two choices; drop it, or send it out all ports, in the hope that it exists somewhere that the switch hasn't learned of yet.

If you have manageable switches, you can manually tell the switch which port your PC's MAC is on; even if the PC is turned off etc at least then the switch will know where to send the packets. On a Cisco switch, you'd accomplish this like: "mac address-table static 02bf.c0a8.dc6c vlan 10 interface GigabitEthernet2/0/37". Not sure if your DLINK will let you do this or not.

If you were using TCP instead of UDP, at least the sender would know the listener isn't responding, and would stop sending.
 
Thanks for the info Flint. You definitly got me on the right track. I unfortunately dont have a cisco switch, but do have a managed Dlink 3100-24 unit. From what i have read, all I need to do is figure out how to "lock" the port. Which in turn will bind the mac address to the port.

From Dlink manual (Yeah I'm actually reading a manual. Big Man Sigh):
"Packets addressed to destinations stored in either the Static or Dynamic databases are immediately forwarded to the port. The MAC Address Table Page can be sorted by interface, VLAN, or MAC Address, whereas MAC addresses are dynamically learned as packets from sources that arrive at the device. Static addresses are configured manually. An address becomes associated with a port by learning the port from the frame’s source address, however if a frame addressed to a destination MAC address is not associated with a port, that frame is flooded to all relevant VLAN ports. To prevent the Bridging table from overflowing, a dynamic MAC address, from which no traffic arrives for a set period, is erased.To prevent static MAC addresses from being deleted when the device is reset, ensure that the port attached to the MAC address is locked."
 
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