[Rack] AP on the building behind us

Dr. Jesus j at hug.gs
Thu Feb 17 17:29:39 PST 2011


On Wed, Feb 16, 2011 at 11:04 PM, Andy Isaacson <adi at hexapodia.org> wrote:
> On Wed, Feb 16, 2011 at 06:02:15PM -0800, Jonathan Lassoff wrote:
>> On Wed, Feb 16, 2011 at 5:44 PM, Andy Isaacson <adi at hexapodia.org> wrote:
>> > I guess I'll be at the space tonight, maybe we can do bandwidth tests
>> > directly connected to the antenna to take the 133 MHz CPU out of the
>> > picture.
>>
>> I unfortunately will be out of here soon. A test that takes gorilla
>> out of the picture would be a good indicator as to what's up.
>
> With my x201s direct attached to the Monkeybrains PoE box, I get 10 MBit
> down and 20 MBit up -- saturating the downlink on my other end actually.
>
> % wget http://www.us.kernel.org/pub/linux/kernel/v2.6/linux-2.6.37.tar.bz2
> ...
> 2011-02-16 22:55:33 (1.06 MB/s) - “linux-2.6.37.tar.bz2” saved [73577826/73577826]
>
> % rsync -av linux-2.6.37.tar.bz2 pyron.hexapodia.org:
> ...
> sent 73586908 bytes  received 31 bytes  2264213.51 bytes/sec
> total size is 73577826  speedup is 1.00
>
> Going to a faster target I can push 30 MBit up the monkeybrains link.
>
> sent 73586908 bytes  received 31 bytes  3131359.11 bytes/sec
>
> Weather's clear right now, so no rain fade.  Would be good to watch
> throughput as the air fills up with H2O.
>
> The problems we're seeing with the switch+router in the picture could be
> due to Cisco 100baseT negotiation problems perhaps?  Or a bad patch cord
> I guess.  I'm likely to break things if I try configuring vlans or
> forcing port speeds so I'll leave that to y'all.
>
> I've put the cables back the way I found them.

Hmm.  It doesn't seem to be a layer 2 problem, I don't see a single rx
error anywhere in the path between gorilla and the wireless device.

For the record, here's what the interface on the switch thinks about
it's connection to the radio:

FastEthernet0/3 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 0012.8080.fc83 (bia 0012.8080.fc83)
  Description: monkeybrains CPE
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 100BaseTX
  input flow-control is unsupported output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:03, output 00:00:08, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 4000 bits/sec, 9 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     18421103 packets input, 2191449476 bytes, 0 no buffer
     Received 1061116 broadcasts (91468 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 91468 multicast, 0 pause input
     0 input packets with dribble condition detected
     11010161 packets output, 1387152570 bytes, 0 underruns
     0 output errors, 0 collisions, 2 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

switch2#sh controllers ethernet-controller fa0/3

  Transmit                                Receive
1387166262 Bytes                       2191567069 Bytes
  11010338 Frames                        18422840 Frames
    547512 Multicast frames                     0 FCS errors
       200 Broadcast frames                 91589 Multicast frames
         0 Pause frames                    971098 Broadcast frames
         0 Single defer frames                  0 Control frames
         0 Multiple defer frames                0 Pause frames
         0 1 collision frames                   0 Unknown opcode frames
         0 2-15 collisions                      0 Alignment errors
         0 Late collisions                      0 Length out of range
         0 Excessive collisions                 0 Symbol error frames
         0 Total collisions                     2 False carrier errors
         0 Control frames                       0 Valid frames, too small
         0 VLAN discard frames                  0 Valid frames, too large
         0 Too old frames                       0 Invalid frames, too small
         0 Tagged frames                        0 Invalid frames, too large
         0 Aborted Tx frames                    0 Discarded frames


Here's what it thinks about the connection to gorilla:

FastEthernet0/6 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 0012.8080.fc86 (bia 0012.8080.fc86)
  Description: sis1.gorilla
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 100BaseTX
  input flow-control is unsupported output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 2000 bits/sec, 5 packets/sec
     10340429 packets input, 1344342579 bytes, 0 no buffer
     Received 201 broadcasts (1 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 1 multicast, 0 pause input
     0 input packets with dribble condition detected
     19063823 packets output, 2230367803 bytes, 0 underruns
     0 output errors, 0 collisions, 2 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

switch2#sh controllers ethernet-controller fa0/6

  Transmit                                Receive
2230452591 Bytes                       1344349903 Bytes
  19065118 Frames                        10340518 Frames
    610230 Multicast frames                     0 FCS errors
    971320 Broadcast frames                     1 Multicast frames
         0 Pause frames                       200 Broadcast frames
         0 Single defer frames                  0 Control frames
         0 Multiple defer frames                0 Pause frames
         0 1 collision frames                   0 Unknown opcode frames
         0 2-15 collisions                      0 Alignment errors
         0 Late collisions                      0 Length out of range
         0 Excessive collisions                 0 Symbol error frames
         0 Total collisions                     0 False carrier errors
         0 Control frames                       0 Valid frames, too small
         0 VLAN discard frames                  0 Valid frames, too large
         0 Too old frames                       0 Invalid frames, too small
         0 Tagged frames                        0 Invalid frames, too large
         0 Aborted Tx frames                    0 Discarded frames

  Transmit and Receive
   2380307 Minimum size frames
  10003243 65 to 127 byte frames
    377590 128 to 255 byte frames
    358714 256 to 511 byte frames
    420189 512 to 1023 byte frames
  15865593 1024 to 1518 byte frames
         0 1519 to 1522 byte frames

Here's what gorilla thinks:

root at gorilla:~# netstat -I sis1 -d -s
Name    Mtu   Network     Address              Ipkts Ierrs    Opkts
Oerrs Colls Drop
sis1    1500  <Link>      00:00:24:c0:fd:49 18290862     0 10339706
 0     0    0

ip:
        35746574 total packets received
        0 bad header checksums
        0 with size smaller than minimum
        1 with data size < data length
        0 with header length < data size
        0 with data length < header length
        0 with bad options
        0 with incorrect version number
        0 fragments received
        0 fragments dropped (duplicates or out of space)
        0 malformed fragments dropped
        0 fragments dropped after timeout
        0 packets reassembled ok
        6533944 packets for this host
        4479 packets for unknown/unsupported protocol
        27066205 packets forwarded
        736149 packets not forwardable
        0 redirects sent
        663897 packets sent from this host
        779 packets sent with fabricated ip header
        0 output packets dropped due to no bufs, etc.
        0 output packets discarded due to no route
        24 output datagrams fragmented
        24 fragments created
        0 datagrams that can't be fragmented
        0 fragment floods
        0 packets with ip length > max ip packet size
        0 tunneling packets that can't find gif
        0 datagrams with bad address in header
        0 input datagrams checksum-processed by hardware
        0 output datagrams checksum-processed by hardware
        1708771 multicast packets which we don't join

sis1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:00:24:c0:fd:49
        description: Monkeybrains Uplink
        priority: 0
        groups: egress
        media: Ethernet autoselect (100baseTX full-duplex)
        status: active
        inet6 fe80::200:24ff:fec0:fd49%sis1 prefixlen 64 scopeid 0x2
        inet 208.90.213.207 netmask 0xffffff80 broadcast 208.90.213.255


More information about the Rack mailing list