strange behavior

Hello everybody,
I’m currently experiencing a strange behavior of my WLAN connection.
My laptop is connected to a NetGear R6300 accesspoint. When I try to ping the router I have 90% packet loss. On the other hand a Windows VM which uses the same WLAN connection has no problem to ping the router and to access the Internet.
It was working great yesterday evening. Then I installed some patches but I don’t think that they were related to WLAN functions. Anyway, I used snapper undochange to roll back the changes. But still same behavior.
Any idea what this could be?
Cheers
Boomer
Here some details:
andromeda:~ # cat /etc/os-release
NAME=openSUSE
VERSION=“13.1 (Bottle)”
VERSION_ID=“13.1”
PRETTY_NAME=“openSUSE 13.1 (Bottle) (x86_64)”
ID=opensuse
ANSI_COLOR=“0;32”
CPE_NAME=“cpe:/o:opensuse:opensuse:13.1”
BUG_REPORT_URL=“https://bugs.opensuse.org
HOME_URL=“https://opensuse.org/
ID_LIKE=“suse”
andromeda:~ # uname -a
Linux andromeda.brainfood.ch 3.11.10-11-desktop #1 SMP PREEMPT Mon May 12 13:37:06 UTC 2014 (3d22b5f) x86_64 x86_64 x86_64 GNU/Linux

andromeda:~ # hwinfo --wlan
22: PCI 400.0: 0282 WLAN controller
[Created at pci.319]
Unique ID: YVtp.rQ7sf3N96mF
Parent ID: qTvu.8Makl3iDVc3
SysFS ID: /devices/pci0000:00/0000:00:1c.1/0000:04:00.0
SysFS BusID: 0000:04:00.0
Hardware Class: network
Model: “Intel PRO/Wireless 5300 AGN [Shiloh] Network Connection”
Vendor: pci 0x8086 “Intel Corporation”
Device: pci 0x4235 “PRO/Wireless 5300 AGN [Shiloh] Network Connection”
SubVendor: pci 0x8086 “Intel Corporation”
SubDevice: pci 0x1121
Driver: “iwlwifi”
Driver Modules: “iwlwifi”
Device File: wlp4s0
Features: WLAN
Memory Range: 0xf8000000-0xf8001fff (rw,non-prefetchable)
IRQ: 47 (no events)
HW Address: 00:16:ea:ed:83:b6
Link detected: yes
WLAN channels: 1 2 3 4 5 6 7 8 9 10 11 12 13 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140
WLAN frequencies: 2.412 2.417 2.422 2.427 2.432 2.437 2.442 2.447 2.452 2.457 2.462 2.467 2.472 5.18 5.2 5.22 5.24 5.26 5.28 5.3 5.32 5.5 5.52 5.54 5.56 5.58 5.6 5.62 5.64 5.66 5.68 5.7
WLAN encryption modes: WEP40 WEP104 TKIP CCMP
WLAN authentication modes: open sharedkey wpa-psk wpa-eap
Module Alias: “pci:v00008086d00004235sv00008086sd00001121bc02sc80i00”
Driver Info #0:
Driver Status: iwlwifi is active
Driver Activation Cmd: “modprobe iwlwifi”
Config Status: cfg=no, avail=yes, need=no, active=unknown
Attached to: #9 (PCI bridge)

andromeda:~ # iwconfig
wlp4s0 IEEE 802.11abgn ESSID:“Cortana”
Mode:Managed Frequency:2.412 GHz Access Point: 84:1B:5E:ED:84:AB
Bit Rate=1 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=70/70 Signal level=-28 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:573 Invalid misc:318 Missed beacon:0

It’s hard to know what is going wrong here. It is not something that I would worry about.

“ping” has always been flaky.

When you load a web page, your connection has a port number that uniquely associates it with your browser process.

For “ping” there is nothing to associate a packet with a particular process. In effect, a “ping” is by an operating system rather than a user process, and the response is to the operating system. Your “ping” process tries to nab responses coming back, and show them to you. On a multi-user computer, one sometimes sees too many responses (some of them probably responses to another user’s ping).

Hello,

I found the problem: we got a new Samsung TV today. When I unplug the Samsung TV from the network, my laptop has perfect WLAN connectivity. As soon as I connect the Samsung TV to the network with a RJ45 cable, my laptop loses WLAN connectivity.

Cheers
Boomer

An IP-Address conflict maybe?
I.e. maybe the Samsung TV has the same IP-Address as your laptop’s WLAN.

Yes, your right
it turned out that there were 2 dhcp servers in the LAN with overlapping IP ranges

thank you very much for your help and sorry disturbance
Boomer