Wireshark · Wireshark-users: Re: [Wireshark-users] Troubleshooting slow network

[Martin Visser <martinvisser99@xxxxxxxxx>]

Multicast on UDP port 1900 will be SSDP or now known as UPnP, Universal Plug and Play. This is just a control protocol used to discover services on the network. The traffic you see might be PC or the like advertising they have Audio/Video available, or your router advertising that a PC can use it to open up it's firewall (for games/bittorent etc).

As it is really just a control protocol, not for sending actual data payloads, 15K packets/sec seems very high. Are you sure this is correct. You can identify the source from the source address - which will be unique on your network - or probably in the packets themselves. (You might need to set UDP port 1900 to be decoded as SSDP).

When you say the network is "slow" you need to be more specific. Is this only to/from the Internet or also LAN to LAN?

Also don't forget that when you do a Wireshark capture on just a regular switch port - you will ONLY see your own traffic and multicast/broadcast traffic. Hence you might not be seeing the greater proportion of traffic in your network. To this you need to enable port-mirroring on your switch and use Wireshark in promiscuous mode.

Regards, Martin

MartinVisser99@xxxxxxxxx

On 1 December 2012 04:43, Cheikhou Dramé <dramecheikhou@xxxxxxxxx> wrote:

port 1900