Re: [Madwifi-users] Weirdness - 12 second dropouts every 4 minutes

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

Don't know if this is apllicable to you, but we have experienced problems 
using the ethernet port on WRAP boxes for some time; I haven't noticed the 
specific pattern you're describing but every WRAP box we've ever deployed 
has had a tendency to hang on heavy sustained ethernet traffic, usually once 
every few days. The radio-link stuff continues to work fine, just the 
passage of traffic through the ethernet port is affected. We added a 
ping-bot watchdog which reboots as a patch. The problem is reduced (but not 
completely eliminated) by hard-coding the eth0 ports to 10baseT-HD or FD. 
You could give that a try and see if it affects your situation.

Tom Sharples
President
Qorvus Systems, Inc.
www.qorvus.net
360.243.7371

----- Original Message ----- 
From: "Edwin Whitelaw" <Edw...@nr...>
To: "madwifi-users" <mad...@li...>; 
<voy...@vo...>
Sent: Sunday, November 20, 2005 8:33 AM
Subject: [Madwifi-users] Weirdness - 12 second dropouts every 4 minutes

> All,
>
> We have a two hop backhaul using three WRAP boxes that has been up for 
> about 6 weeks.  Throughput with iperf is 18-19mbs consistently.  RSSI 
> values are typical as indicated below and the Bit Rate stays at 54M. 
> Here's the weirdness.
>
> Exactly every 239 seconds the ath0 interface on Hubbell will drop 
> connection for exactly 12 seconds, but only on traffic passing *through* 
> the interface.  There are also occasional doprouts at 50 and 189 
> increments.  Note that the sum is 239 seconds.
>
> If I ping from NRVU to the Hubbell ath0 IP, it never drops but pings to 
> anything on the other side of the interface (Hubbell eth0 or ath1 as well 
> as to CRC) experience the interruption.
>
> Simultaneous pings from the CRC end to Hubbell's eth0 or ath1 interface 
> show no dropouts while the ping from the NRVU end is interrupted.  Pinging 
> from CRC *through* the Hubbell ath0 link to NRVU does have the same 
> pattern of dropouts as expected.
>
> This backhaul feeds my entire network and the dropout behavior is making 
> all interactive sessions extremely unpleasant to unusable.  The clockwork 
> regularity of the symptoms lead me to believe there is some sort of 
> failure/disconnect/re-association phenomenon occurring but I am not able 
> to deduce where.  I have rebooted both NRVU and Hubbell.
>
> Any help/suggestions/solutions will be *very* much appreciated.
>
> Edwin
>
>
> eth0-CRC-ath0<-/\/\/->ath1-Hubbell-ath0<-/\/\/\/->ath0-NRVU-eth0<---Internal 
> network
>         CM9   4.6 mi CM9  Master  CM9   3.9 mi   CM9
>
> All three boxes are running Voyage Linux 0.2pre1.  Typical dmesg output 
> below:
> crc:~# dmesg
> Linux version 2.6.8-486-voyage (root@punknix-uml) (gcc version 3.3.5 
> (Debian 1:3.3.5-13)) #1 Tue Jul 12 04:06:34 GMT 2005
> .
> .
> .
> ath_hal: 0.9.14.9 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413)
> wlan: 0.8.6.0 (EXPERIMENTAL)
> ath_rate_onoe: 1.0
> ath_pci: 0.9.6.0 (EXPERIMENTAL)
> Build date: Jul 12 2005
> Debugging version (IEEE80211)
> ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
> ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
> ath0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 
> 24Mbps 36Mbps 48Mbps 54Mbps
> ath0: turboA rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
> ath0: turboG rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
> ath0: H/W encryption support: WEP AES AES_CCM TKIP
> ath0: mac 5.9 phy 4.3 radio 3.6
> ath0: Use hw queue 1 for WME_AC_BE traffic
> ath0: Use hw queue 0 for WME_AC_BK traffic
> ath0: Use hw queue 2 for WME_AC_VI traffic
> ath0: Use hw queue 3 for WME_AC_VO traffic
> ath0: Use hw queue 8 for CAB traffic
> ath0: Use hw queue 9 for beacons
> Debugging version (ATH)
> ath0: Atheros 5212: mem=0x80000000, irq=12
> ----end dmesg----
>
> ----CRC info------------------
> crc:~# ifconfig
> ath0      Link encap:Ethernet  HWaddr 00:0B:6B:35:A7:CE
>          inet addr:10.220.1.1  Bcast:10.220.1.4  Mask:255.255.255.252
>
> eth0      Link encap:Ethernet  HWaddr 00:0D:B9:01:AC:B4
>          inet addr:10.220.202.2  Bcast:10.220.202.255  Mask:255.255.255.0
>
> crc:~# iwconfig ath0
> ath0      IEEE 802.11a  ESSID:"crc-hub"
>          Mode:Managed  Frequency:5.825 GHz  Access Point: 
> 00:0B:6B:35:C0:4D
>          Bit Rate:54 Mb/s   Tx-Power:18 dBm   Sensitivity=0/3
>          Retry:off   RTS thr:off   Fragment thr:off
>          Encryption key:off
>          Power Management:off
>          Link Quality=25/94  Signal level=-70 dBm  Noise level=-95 dBm
>          Rx invalid nwid:1  Rx invalid crypt:0  Rx invalid frag:0
>          Tx excessive retries:1223  Invalid misc:1223   Missed beacon:190
>
> crc:~# cat /etc/network/interfaces
> # Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or
> # /usr/share/doc/ifupdown/examples for more information.
>
> auto lo ath0 eth0
>
> iface lo inet loopback
>
> iface ath0 inet static
>        address 10.220.1.1
>        netmask 255.255.255.252
>        broadcast 10.220.1.4
>        wireless_essid crc-hub
>        wireless_channel 165
> #       wireless_rate 36M
>        wireless_mode managed
> #       wireless_key 313233343536373839307A7863
>        up /usr/bin/athctrl -i ath0 -d 10000
>
> #iface eth0 inet dhcp
> #
>
> iface eth0 inet static
>        address 10.220.202.2
>        netmask 255.255.255.0
>        broadcast 10.220.202.255
>        up route add default gw 10.220.202.1
>        up /usr/local/sbin/remountro
>
> crc:~# athstats
> 190     beacon miss interrupts
> 940     mib interrupts
> 274883594       packet sent on the interface
> 210     tx management frames
> 3341    tx frames discarded prior to association
> 80      tx queue stopped because full
> 1223    tx failed 'cuz too many retries
> 18352611        long on-chip tx retries
> 8       tx frames with no ack marked
> 1348083 tx frames with an alternate rate
> 2753612 rx failed 'cuz of bad CRC
> 229032471       packet recv on the interface
> 92747   periodic calibrations
> 3       rfgain value change
> 5565257 rate control checks
> 316     rate control raised xmit rate
> 312     rate control dropped xmit rate
> rssi of last ack: 30
> rssi of last rcv: 22
> 1       switched default/rx antenna
> Antenna profile:
> [1] tx 274882575 rx 256398335
> [2] tx        2 rx       46
>
> ---end CRC info---------
>
>
> ---Hubbell info---------
> hubbel:/etc/network# ifconfig
> ath0      Link encap:Ethernet  HWaddr 00:0B:6B:34:8A:D9
>          inet addr:10.220.2.2  Bcast:10.220.2.4  Mask:255.255.255.252
>
> ath1      Link encap:Ethernet  HWaddr 00:0B:6B:35:C0:4D
>          inet addr:10.220.1.2  Bcast:10.220.1.4  Mask:255.255.255.252
>
> eth0      Link encap:Ethernet  HWaddr 00:0D:B9:00:5A:B8
>          inet addr:10.220.201.1  Bcast:10.220.201.255  Mask:255.255.255.0
>
> hubbel:/etc/network# iwconfig
> lo        no wireless extensions.
>
> eth0      no wireless extensions.
>
> ath0      IEEE 802.11a  ESSID:"hub-nrvu"
>          Mode:Master  Frequency:5.76 GHz  Access Point: 00:0B:6B:34:8A:D9
>          Bit Rate:0 kb/s   Tx-Power:18 dBm   Sensitivity=0/3
>          Retry:off   RTS thr:off   Fragment thr:off
>          Encryption key:off
>          Power Management:off
>          Link Quality=30/94  Signal level=-65 dBm  Noise level=-95 dBm
>          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>          Tx excessive retries:22962  Invalid misc:22962   Missed beacon:0
>
> ath1      IEEE 802.11a  ESSID:"crc-hub"
>          Mode:Master  Frequency:5.825 GHz  Access Point: 00:0B:6B:35:C0:4D
>          Bit Rate:0 kb/s   Tx-Power:18 dBm   Sensitivity=0/3
>          Retry:off   RTS thr:off   Fragment thr:off
>          Encryption key:off
>          Power Management:off
>          Link Quality=27/94  Signal level=-68 dBm  Noise level=-95 dBm
>          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>          Tx excessive retries:19523  Invalid misc:19523   Missed beacon:0
>
> hubbel:/etc/network# cat interfaces
> # Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or
> # /usr/share/doc/ifupdown/examples for more information.
>
> auto lo ath1 ath0 eth0
>
> iface lo inet loopback
>
> iface ath1 inet static
>        address 10.220.1.2
>        netmask 255.255.255.252
>        broadcast 10.220.1.4
>        wireless_essid crc-hub
>        wireless_channel 165
>        wireless_mode master
>        up /sbin/iwpriv mode 1
>        up /usr/bin/athctrl -i ath1 -d 10000
>
>
> iface ath0 inet static
>        address 10.220.2.2
>        netmask 255.255.255.252
>        broadcast 10.220.2.4
>        wireless_essid hub-nrvu
>        wireless_channel 152
>        wireless_mode master
>        up /sbin/iwpriv mode 1
>        up /usr/bin/athctrl -i ath0 -d 8000
>
> iface eth0 inet static
>        address 10.220.201.1
>        netmask 255.255.255.0
>        broadcast 10.220.201.255
>        up /usr/local/sbin/remountro
>
> hubbel:/etc/network# athstats
> 252163  packet sent on the interface
> 6       tx management frames
> 22962   tx failed 'cuz too many retries
> 104574  long on-chip tx retries
> 1007    tx frames with no ack marked
> 798     tx frames with an alternate rate
> 890     rx failed 'cuz of bad CRC
> 222951  packet recv on the interface
> 10378   rx PHY errors:
>    10378 OFDM timing
> 35251   beacons transmitted
> 120     periodic calibrations
> 3611    rate control checks
> 7       rate control raised xmit rate
> 5       rate control dropped xmit rate
> rssi of last ack: 33
> rssi of last rcv: 28
> 1       switched default/rx antenna
> Antenna profile:
> [1] tx   228775 rx   222977
> [2] tx      431 rx        4
>
> --------end Hubbell info--------
>
> --------NRVU info----------
> nrvu:~# ifconfig
> ath0      Link encap:Ethernet  HWaddr 00:0B:6B:35:C4:5A
>          inet addr:10.220.2.1  Bcast:10.220.2.4  Mask:255.255.255.252
>
> eth0      Link encap:Ethernet  HWaddr 00:0D:B9:02:2F:00
>          inet addr:10.220.200.1  Bcast:10.220.200.255  Mask:255.255.255.0
>
> eth0:1    Link encap:Ethernet  HWaddr 00:0D:B9:02:2F:00
>          inet addr:204.119.253.225  Bcast:204.119.253.255 
> Mask:255.255.255.224
>
> nrvu:~# iwconfig ath0
> ath0      IEEE 802.11a  ESSID:"hub-nrvu"
>          Mode:Managed  Frequency:5.76 GHz  Access Point: 00:0B:6B:34:8A:D9
>          Bit Rate:54 Mb/s   Tx-Power:18 dBm   Sensitivity=0/3
>          Retry:off   RTS thr:off   Fragment thr:off
>          Encryption key:off
>          Power Management:off
>          Link Quality=29/94  Signal level=-66 dBm  Noise level=-95 dBm
>          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>          Tx excessive retries:9148  Invalid misc:9148   Missed beacon:10
>
> nrvu:/etc/network# cat interfaces
> # Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or
> # /usr/share/doc/ifupdown/examples for more information.
>
> auto lo ath0 eth0 eth0:1
>
> iface lo inet loopback
>
> iface ath0 inet static
>        address 10.220.2.1
>        netmask 255.255.255.252
>        broadcast 10.220.2.4
>        wireless_essid hub-nrvu
>        wireless_channel 152
>        wireless_mode managed
>        up /usr/bin/athctrl -iath0 -d8000
>
> iface eth0 inet static
>        address 10.220.200.1
>        netmask 255.255.255.0
>        broadcast 10.220.200.255
>
> iface eth0:1 inet static
>        address 204.119.253.225
>        netmask 255.255.255.224
>        broadcast 204.119.253.255
>
> nrvu:/etc/network# athstats
> 10      beacon miss interrupts
> 4       mib interrupts
> 1350470 packet sent on the interface
> 17      tx management frames
> 124     tx frames discarded prior to association
> 9148    tx failed 'cuz too many retries
> 95905   long on-chip tx retries
> 2       tx frames with no ack marked
> 837     tx frames with an alternate rate
> 19345   rx failed 'cuz of bad CRC
> 1       rx discarded 'cuz frame too large
> 1500378 packet recv on the interface
> 2       rx PHY errors:
>    2 OFDM restart
> 512     periodic calibrations
> 30856   rate control checks
> 9       rate control raised xmit rate
> 5       rate control dropped xmit rate
> rssi of last ack: 36
> rssi of last rcv: 31
> 1       switched default/rx antenna
> Antenna profile:
> [1] tx  1341338 rx  1595910
>
> -------end NRVU info---------
>
> -- 
> <=+=+=+==+=+=+==+=+=+=+=+=+=+=+=>
> Edwin Whitelaw, P.E.
> New River Valley Unwired, LLC
> 2200 Lonesome Dove Dr
> Christiansburg, VA 24073
> 540-239-0318
>
>
>
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