Thank you for the fast reply.

On 10/21/19 5:53 PM, Stefan Sperling wrote:
> On Mon, Oct 21, 2019 at 05:42:17PM +0000, mailinglists wrote:
>>> Synopsis:   Connection issues when connected via Wifi
>>> Category:   network
>>> Environment:
>>      System      : OpenBSD 6.6
>>      Details     : OpenBSD 6.6 (GENERIC.MP) #372: Sat Oct 12 10:56:27 MDT 
>> 2019
>>                       
>> dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
>>
>>      Architecture: OpenBSD.amd64
>>      Machine     : amd64
>>
>>> Description:
>>      
>> I am experiencing connection issues when connected via Wifi, that doesn't 
>> persist in Ethernet / LAN context.
>> Symptoms: Working internet connection for a minute. Then suddenly I am 
>> unable to establish any kind of TCP connection.
>> UDP is not affected doesn't suffer from this problem. (nc -nvvu 80.80.80.80 
>> 53 Connected suc)
>> My built-in Wireless adapter is iwn0. I also tried it with my usb Wireless 
>> adapter athn0.
> Could you also show dmesg lines printed when you plug in your athn device?

OpenBSD 6.6 (GENERIC.MP) #372: Sat Oct 12 10:56:27 MDT 2019
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8451125248 (8059MB)
avail mem = 8182296576 (7803MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.6 @ 0xdae9c000 (68 entries)
bios0: vendor LENOVO version "8DET58WW (1.28 )" date 02/14/2012
bios0: LENOVO 4291W99
acpi0 at bios0: ACPI 4.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP SLIC SSDT SSDT SSDT HPET APIC MCFG ECDT ASF! TCPA SSDT 
SSDT DMAR UEFI UEFI UEFI
acpi0: wakeup devices LID_(S3) SLPB(S3) IGBE(S4) EXP4(S4) EXP7(S4) EHC1(S3) 
EHC2(S3) HDEF(S4)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz, 2592.02 MHz, 06-2a-07
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.1.2, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz, 2591.58 MHz, 06-2a-07
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz, 2591.59 MHz, 06-2a-07
cpu2: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz, 2591.58 MHz, 06-2a-07
cpu3: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xf8000000, bus 0-63
acpiec0 at acpi0
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEG_)
acpiprt2 at acpi0: bus 2 (EXP1)
acpiprt3 at acpi0: bus 3 (EXP2)
acpiprt4 at acpi0: bus 5 (EXP4)
acpiprt5 at acpi0: bus 13 (EXP5)
acpiprt6 at acpi0: bus -1 (EXP7)
acpicpu0 at acpi0: C3(350@104 io@0x415), C1(1000@1 halt), PSS
acpicpu1 at acpi0: C3(350@104 io@0x415), C1(1000@1 halt), PSS
acpicpu2 at acpi0: C3(350@104 io@0x415), C1(1000@1 halt), PSS
acpicpu3 at acpi0: C3(350@104 io@0x415), C1(1000@1 halt), PSS
acpipwrres0 at acpi0: PUBS, resource for EHC1, EHC2
acpitz0 at acpi0: critical temperature is 99 degC
acpibtn0 at acpi0: LID_
acpibtn1 at acpi0: SLPB
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
acpicmos0 at acpi0
tpm0 at acpi0: TPM_ addr 0xfed40000/0x5000, device 0x0000104a rev 0x4e
acpibat0 at acpi0: BAT0 model "45N1023" serial   267 type LION oem "SANYO"
acpiac0 at acpi0: AC unit online
acpithinkpad0 at acpi0
"PNP0C14" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpidock0 at acpi0: GDCK not docked (0)
acpivideo0 at acpi0: VID_
acpivout at acpivideo0 not configured
acpivideo1 at acpi0: VID_
cpu0: using VERW MDS workaround (except on vmm entry)
cpu0: Enhanced SpeedStep 2592 MHz: speeds: 2601, 2600, 2400, 2200, 2000, 1800, 
1600, 1400, 1200, 1000, 800 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 2G Host" rev 0x09
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 3000" rev 0x09
drm0 at inteldrm0
inteldrm0: msi
"Intel 6 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
puc0 at pci0 dev 22 function 3 "Intel 6 Series KT" rev 0x04: ports: 16 com
com4 at puc0 port 0 apic 2 int 19: ns16550a, 16 byte fifo
com4: probed fifo depth: 0 bytes
em0 at pci0 dev 25 function 0 "Intel 82579LM" rev 0x04: msi, address 
f0:de:f1:80:af:59
ehci0 at pci0 dev 26 function 0 "Intel 6 Series USB" rev 0x04: apic 2 int 16
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 
addr 1
azalia0 at pci0 dev 27 function 0 "Intel 6 Series HD Audio" rev 0x04: msi
azalia0: codecs: Conexant CX20590, Intel/0x2805, using Conexant CX20590
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel 6 Series PCIE" rev 0xb4: msi
pci1 at ppb0 bus 2
ppb1 at pci0 dev 28 function 1 "Intel 6 Series PCIE" rev 0xb4: msi
pci2 at ppb1 bus 3
iwn0 at pci2 dev 0 function 0 "Intel Centrino Advanced-N 6205" rev 0x34: msi, 
MIMO 2T2R, MoW, address a0:88:b4:e5:36:20
ppb2 at pci0 dev 28 function 3 "Intel 6 Series PCIE" rev 0xb4: msi
pci3 at ppb2 bus 5
ppb3 at pci0 dev 28 function 4 "Intel 6 Series PCIE" rev 0xb4: msi
pci4 at ppb3 bus 13
sdhc0 at pci4 dev 0 function 0 "Ricoh 5U823 SD/MMC" rev 0x04: apic 2 int 16
sdhc0: SDHC 3.0, 50 MHz base clock
sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed, dma
ehci1 at pci0 dev 29 function 0 "Intel 6 Series USB" rev 0x04: apic 2 int 23
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 
addr 1
pcib0 at pci0 dev 31 function 0 "Intel QM67 LPC" rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 6 Series AHCI" rev 0x04: msi, AHCI 1.3
ahci0: port 0: 6.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, WDC WDS500G2B0A, 4010> naa.5001b448b88c781e
sd0: 476940MB, 512 bytes/sector, 976773168 sectors, thin
ichiic0 at pci0 dev 31 function 3 "Intel 6 Series SMBus" rev 0x04: apic 2 int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-12800 SO-DIMM
spdmem1 at iic0 addr 0x51: 4GB DDR3 SDRAM PC3-12800 SO-DIMM
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
wsmouse1 at pms0 mux 0
pms0: Synaptics clickpad, firmware 8.0, 0x1e2b1 0x940300
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
aps0 at isa0 port 0x1600/31
vmm0 at mainbus0: VMX/EPT
uhub2 at uhub0 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 
2.00/0.00 addr 2
athn0 at uhub2 port 2 configuration 1 interface 0 "ATHEROS USB2.0 WLAN" rev 
2.00/1.08 addr 3
ugen0 at uhub2 port 3 "UPEK Biometric Coprocessor" rev 1.01/0.02 addr 4
ugen1 at uhub2 port 4 "Broadcom Corp Broadcom Bluetooth Device" rev 2.00/7.48 
addr 5
uvideo0 at uhub2 port 6 configuration 1 interface 0 "Chicony Electronics Co., 
Ltd. Integrated Camera" rev 2.00/8.54 addr 6
video0 at uvideo0
uhub3 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 
2.00/0.00 addr 2
umodem0 at uhub3 port 4 configuration 1 interface 1 "Lenovo F5521gw" rev 
2.00/0.00 addr 3
umodem0: data interface 2, has CM over data, has break
umodem0: status change notification available
ucom0 at umodem0
umodem1 at uhub3 port 4 configuration 1 interface 3 "Lenovo F5521gw" rev 
2.00/0.00 addr 3
umodem1: data interface 4, has CM over data, has break
umodem1: status change notification available
ucom1 at umodem1
umodem2 at uhub3 port 4 configuration 1 interface 9 "Lenovo F5521gw" rev 
2.00/0.00 addr 3
umodem2: data interface 10, has CM over data, has break
umodem2: status change notification available
ucom2 at umodem2
ugen2 at uhub3 port 4 configuration 1 "Lenovo F5521gw" rev 2.00/0.00 addr 3
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006>
sd1: 476937MB, 512 bytes/sector, 976767473 sectors
root on sd1a (fcd8cec19f7d3313.a) swap on sd1b dump on sd1b
inteldrm0: 1366x768, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
athn0: AR9271 rev 1 (1T1R), ROM rev 13, address 60:e3:27:1c:fc:cb

>
> This problem happens with both iwn and athn, does it?
The last time I tried with athn0, the connection broke after about 10
minutes. Today, it was only very slow.
>
> Please trigger this problem again and show the output of:
>
>   netstat -n -I athn0

Name    Mtu   Network     Address              Ipkts Ifail    Opkts Ofail Colls
athn0   1500  <Link>      60:e3:27:1c:fc:cb    66790 14310    66427     0     0
athn0   1500  192.168.101 192.168.101.165      66790 14310    66427     0     0

>   netstat -W athn0

ieee80211 on athn0:
        1 input packet with bad version
        26 input packets too short
        450 input packets from wrong bssid
        16497 input packet duplicates discarded
        944 input packets with wrong direction
        8 input multicast echo packets discarded
        0 input packets from unassociated station discarded
        0 input encrypted packets without wep/wpa config discarded
        20 input unencrypted packets with wep/wpa config discarded
        12294 input wep/wpa packets processing failed
        0 input packet decapsulations failed
        0 input management packets discarded
        34 input control packets discarded
        0 input packets with truncated rate set
        0 input packets with missing elements
        0 input packets with elements too big
        53 input packets with elements too small
        0 input packets with invalid channel
        76 input packets with mismatched channel
        0 node allocations failed
        0 input packets with mismatched ssid
        1 input packet with unsupported auth algorithm
        0 input authentications failed
        0 input associations from wrong bssid
        0 input associations without authentication
        0 input associations with mismatched capabilities
        0 input associations without matching rates
        0 input associations with bad rsn ie
        0 input deauthentication packets
        0 input disassociation packets
        0 input packets with unknown subtype
        0 input packets failed for lack of mbufs
        0 input decryptions failed on crc
        0 input ahdemo management packets discarded
        0 input packets with bad auth request
        9 input eapol-key packets
        0 input eapol-key packets with bad mic
        0 input eapol-key packets replayed
        0 input packets with bad tkip mic
        0 input tkip mic failure notifications
        0 input packets on unauthenticated port
        0 output packets failed for lack of mbufs
        0 output packets failed for no nodes
        0 output packets of unknown management type
        2 output packets on unauthenticated port
        3 active scans started
        0 passive scans started
        0 nodes timed out
        0 failures with no memory for crypto ctx
        11990 ccmp decryption errors
        131 ccmp replayed frames
        0 cmac icv errors
        0 cmac replayed frames
        0 tkip icv errors
        0 tkip replays
        0 pbac errors
        0 HT negotiation failures because peer does not support MCS 0-7
        0 HT negotiation failures because we do not support basic MCS set
        0 HT negotiation failures because peer uses bad crypto
        1 HT protection change
        2 new input block ack agreements
        0 new output block ack agreements
        26 input frames below block ack window start
        9 input frames above block ack window end
        1 input block ack window slide
        0 input block ack window jumps
        0 duplicate input block ack frames
        74 expected input block ack frames never arrived
        1 input block ack window gap timed out
        0 input block ack agreements timed out
        0 output block ack agreements timed out

>
>   netstat -n -I iwn0

Name    Mtu   Network     Address              Ipkts Ifail    Opkts Ofail Colls
iwn0    1500  <Link>      a0:88:b4:e5:36:20     1324     2      152     0     0
iwn0    1500  192.168.101 192.168.101.141       1324     2      152     0     0

>   netstat -W iwn0

ieee80211 on iwn0:
        0 input packets with bad version
        3 input packets too short
        0 input packets from wrong bssid
        1128 input packet duplicates discarded
        0 input packets with wrong direction
        11 input multicast echo packets discarded
        0 input packets from unassociated station discarded
        0 input encrypted packets without wep/wpa config discarded
        0 input unencrypted packets with wep/wpa config discarded
        4 input wep/wpa packets processing failed
        0 input packet decapsulations failed
        0 input management packets discarded
        0 input control packets discarded
        0 input packets with truncated rate set
        0 input packets with missing elements
        0 input packets with elements too big
        0 input packets with elements too small
        213 input packets with invalid channel
        260 input packets with mismatched channel
        0 node allocations failed
        0 input packets with mismatched ssid
        0 input packets with unsupported auth algorithm
        0 input authentications failed
        0 input associations from wrong bssid
        0 input associations without authentication
        0 input associations with mismatched capabilities
        0 input associations without matching rates
        0 input associations with bad rsn ie
        183 input deauthentication packets
        0 input disassociation packets
        0 input packets with unknown subtype
        0 input packets failed for lack of mbufs
        0 input decryptions failed on crc
        0 input ahdemo management packets discarded
        0 input packets with bad auth request
        11 input eapol-key packets
        0 input eapol-key packets with bad mic
        0 input eapol-key packets replayed
        0 input packets with bad tkip mic
        0 input tkip mic failure notifications
        0 input packets on unauthenticated port
        0 output packets failed for lack of mbufs
        0 output packets failed for no nodes
        0 output packets of unknown management type
        263 output packets on unauthenticated port
        2 active scans started
        0 passive scans started
        0 nodes timed out
        0 failures with no memory for crypto ctx
        1 ccmp decryption error
        58 ccmp replayed frames
        0 cmac icv errors
        0 cmac replayed frames
        0 tkip icv errors
        0 tkip replays
        0 pbac errors
        0 HT negotiation failures because peer does not support MCS 0-7
        0 HT negotiation failures because we do not support basic MCS set
        0 HT negotiation failures because peer uses bad crypto
        2 HT protection changes
        3 new input block ack agreements
        1 new output block ack agreement
        0 input frames below block ack window start
        0 input frames above block ack window end
        0 input block ack window slides
        0 input block ack window jumps
        0 duplicate input block ack frames
        0 expected input block ack frames never arrived
        0 input block ack window gaps timed out
        0 input block ack agreements timed out
        0 output block ack agreements timed out

>
> Please also check if any of these commands make your problem disappear:
>
>   ifconfig athn0 mode 11a
>   ifconfig athn0 mode 11g
>
>   ifconfig iwn0 mode 11a
>   ifconfig iwn0 mode 11g
I forgot to say. I always do this. Without I often have no connection
since start.

>> IMPORTANT: This system is freshly installed 6.6 without any changes to it 
>> (except for installed packages). This is NOT a problem of my local network / 
>> router / gateway. My Linux systems, that reside in the very same network, 
>> are all unaffected. My network is IPv4 only. No IPv6 available.
> It would good to know what model of AP you are using exactly.
> This kind of issue is very very hard to fix without being able to reproduce
> the problem locally. Perhaps I can find a similar AP somewhere.
My AP is a IPFire 2.23. The Wifi Adapter for this machine is a "usb:
Ralink Technology, Corp. RT5572 Wireless Adapter".
The Ipfire image can be downloaded on ipfire.org.
For testing I allowed all outgoing traffic from my laptop to the internet.

Indeed I now one person who has quite the same network infrastructure as
me and his OpenBSD works perfectly.

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