Wireshark mailing list archives
Re: Troubleshooting slow network
From: Martin Visser <martinvisser99 () gmail com>
Date: Mon, 3 Dec 2012 09:03:13 +1100
Just to be clear, 2 packets, 1ms apart IS 1000 pps - just not typically valid for extrapolation that might make you t think the network is busy Regards, Martin MartinVisser99 () gmail com On 3 December 2012 08:59, Martin Visser <martinvisser99 () gmail com> wrote:
Cheikhou, A couple of things. 1. The packets per second column is an anomaly in this case. You only have a few packets (most show 2). So the calculation of pps is really going to be skewed here. (2 packets very close to each other, say 1ms apart, would be interpreted as 1000 pps - clearly not right). 2. This isn't going to tell you anything about Internet usage. You are only seeing the "leaked" traffic from multicasts to your port. You will need to get someway of getting the traffic on the Internet link. There are a few switches available for only a few hundred dollars that can do port-mirroring. Another way is to set up a PC (Linux is best) in bridge mode, and run Wireshark on this as it sees the traffic go by. Regards, Martin Regards, Martin MartinVisser99 () gmail com On 3 December 2012 00:57, Cheikhou Dramé <dramecheikhou () gmail com> wrote:Le 02/12/2012 04:04, Martin Visser a écrit : 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 () gmail com On 1 December 2012 04:43, Cheikhou Dramé <dramecheikhou () gmail com> wrote:port 1900thanks for your reply. My switches can't do port-mirroring.As seen in the file i have join , you can see the traffic wich i'm talking about , the network is slow just from and to the internet. ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribe <wireshark-users-request () wireshark org?subject=unsubscribe> ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org ?subject=unsubscribe
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Current thread:
- Re: Troubleshooting slow network Martin Visser (Dec 01)
- Re: Troubleshooting slow network Cheikhou Dramé (Dec 02)
- Re: Troubleshooting slow network Martin Visser (Dec 02)
- Re: Troubleshooting slow network Martin Visser (Dec 02)
- Re: Troubleshooting slow network Cheikhou Dramé (Dec 02)
- Re: Troubleshooting slow network Cheikhou Dramé (Dec 06)
- Re: Troubleshooting slow network Martin Visser (Dec 02)
- Re: Troubleshooting slow network Cheikhou Dramé (Dec 02)