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#1 2017-06-07 06:49:30

martix
Kim Jong-un Stunt Double
Registered: 2016-02-19
Posts: 1,267

Unknown traffic on wlan

---Moved to its own thread---

I have a broadcom device too, but I guess it's not device-related. The symptom: After connecting to the network via wlan, there is permanent (down-)traffic (which takes a huge part of the bandwith - even if everything is closed!). After some research I found iptraf, which shows a stream something like

UDP (1356 bytes) from 10.1.133.6:46822 to 239.1.1.122:2000 on wlan0

I don't get this line. Local ip is (192.168.x.x). So far I figured that it might have something to do with iptv (which I do have, but NOT on the computer, it's a different device, but I cannot explain how it interferes). Research suggests that 239.1.1.122 is a multicast address. The internet via wlan is slow (obviously the stream taking the bigger part of the bandwidth - free space is not getting less on / or in the user directory).

Last edited by damo (2017-06-07 08:11:22)

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#2 2017-06-07 10:34:02

earlybird
ほやほや
Registered: 2015-12-16
Posts: 608
Website

Re: Unknown traffic on wlan

Traffic to a multicast addresses is flooded to most devices on the network (unless you prevent this using capable networking hardware) since target addresses are not constrained by the source address. If you wanted target addresses to be constrained by the source address, you'd use the source network's broadcast address.

Look these up: unicast, broadcast, multicast, anycast to understand the differences.

BTW just use Wireshark to peek into the UDP packet!

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#3 2017-06-07 12:35:40

martix
Kim Jong-un Stunt Double
Registered: 2016-02-19
Posts: 1,267

Re: Unknown traffic on wlan

Ok, thank you for showing the direction.

I was just not getting at all what is happening but with the keywords I'm starting to understand what is going on (at least I hope so). It was surprising as the traffic is not even shown in tools like Net Activity Viewer but there is clearly a network misconfiguration. I will dig into it and I have a direction now.  smile

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