[Click] Why roofnet can not work on high rates

[Roberto Riggio]

You could also consider this (I'm the project maintainer):

http://www.wing-project.org/

It is a fork of roofnet and enhances it with several new features, most
notably support multiple wireless interfaces and the WCETT routing metric.

R.

Il 17/01/2011 07:50, Robert Sombrutzki ha scritto:
> Hello,
> we had the same problem using ath9k, which is part of the Compat-wireless
> package (http://wireless.kernel.org/en/users/Download). We're using the
> version 2010-12-16
> (http://wireless.kernel.org/download/compat-wireless-2.6/compat-wireless-2010-12-16.tar.bz2)
> and same patches from openwrt (backfire). Using this driver, which is newer
> than your driver (Ubuntu), rate selection using the radiotab header doesn't
> work, since the driver ignores the rates. The function "static bool
> __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,struct sk_buff
> *skb)" in net/mac80211/tx.c considers the radiotap flags and nothing else.
> There is already a patch to solve this problem:
> https://patchwork.kernel.org/patch/43026/
>
> Best regards,
> Robert
>
> On Montag, 17. Januar 2011, 欧阳鑫 wrote:
>> Hi, everyone.
>>
>>       I am running roofnet experiments on 2 Ubuntu hosts with 2.6.32-26
>> kernel. Both are AR5416 cards with ath9k driver. All cards run in Monitor
>> mode.
>>
>>       The problem is that hosts seems to be running under 1Mbps rate ONLY.
>> Command "read srcr/es.bcast_stats" shows:
>> 200 Read handler 'srcr/es.bcast_stats' OK
>> DATA 363
>> 5.167.1.211 00-25-86-A7-01-D3 seq 1295164746 period 30000 tau 300000 sent
>> 12 last_rx 1.762133
>> 5.167.1.211 00-25-86-A7-01-D3 [ 2 60 100 100 198 0 ]
>> 5.167.1.211 00-25-86-A7-01-D3 [ 2 1500 100 100 197 0 ]
>> 5.167.1.211 00-25-86-A7-01-D3 [ 4 1500 0 100 198 0 ]
>> 5.167.1.211 00-25-86-A7-01-D3 [ 11 1500 0 100 196 0 ]
>> 5.167.1.211 00-25-86-A7-01-D3 [ 22 1500 0 100 197 0 ]
>>      I do not  know why fwd_rate with 2Mb/s, 5.5 Mb/s and 11 Mb/s are all
>> 0s.
>>
>>      I forced the data rate to be 5.5Mbps by SetTXRate(11) on PC1, then ping
>> PC1 on PC2, then I run tcpdump on PC2, the result is as follows:
>> tcpdump -i wlan0 -n -e -xX
>>
>> 15:59:49.476661 5.5 Mb/s 63dBm tx power [0x00000010] DA:ff:ff:ff:ff:ff:ff
>> SA:PC2-MAC  BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap
>> SNAP (0xaa) Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown
>> (0x0941): Unnumbered, ui, Flags [Command], length 1494
>>          0x0000:  aaaa 0300 0000 0941 0200 87e4 3c00 0b00  .......A....<...
>>          0x0010:  dc05 0000 05a7 01d3 0100 0000 75a5 324d  ............u.2M
>>          0x0020:  3075 0000 e093 0400                      0u......
>> 15:59:49.476661 1.0 Mb/s [0x0000000f] DA:ff:ff:ff:ff:ff:ff SA:PC2-MAC
>> BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa)
>> Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0941):
>> Unnumbered, ui, Flags [Command], length 1494
>>          0x0000:  aaaa 0300 0000 0941 0200 87e4 3c00 0b00  .......A....<...
>>          0x0010:  dc05 0000 05a7 01d3 0100 0000 75a5 324d  ............u.2M
>>          0x0020:  3075 0000 e093 04                         0u.....
>>
>>   15:59:48.460612 5.5 Mb/s 63dBm tx power [0x00000010] DA:PC1-MAC SA:PC2-MAC
>> BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa)
>> Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0943):
>> Unnumbered, ui, Flags [Command], length 162
>>          0x0000:  aaaa 0300 0000 0943 0b04 0101 0000 fc7b  .......C.......{
>>          0x0010:  0000 0054 0000 0000 0000 0000 0000 0000 ...T............
>>          0x0020:  0000 0000 0000 0000
>> ........
>> 15:59:48.460612 1.0 Mb/s [0x0000000f] DA:PC1-MAC  SA:PC2-MAC
>> BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa)
>> Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0943):
>> Unnumbered, ui, Flags [Command], length 162
>>          0x0000:  aaaa 0300 0000 0943 0b04 0101 0000 fc7b
>> .......C.......{
>>          0x0010:  0000 0054 0000 0000 0000 0000 0000 0000
>> ...T............
>>          0x0020:  0000 0000 0000 00
>> .......
>>    It seemed that each packet was caught by tcpdump 2 times, and the 2
>> copies share the same timestamp but different rates.
>>
>>    My second question is why each packet was caught with a rate of 5.5Mb/s
>> first, and then with a rate of 1Mb/s.
>>
>>    The attachment is my configuration file: gen_config_roofnet.pl. I do not
>> know if there is some error with the configuration file. Would you help me
>> check for it?
>>
>>   Thank you very much!
>