How to enable 802.11n and above in Adhoc

[GANLIN TANG]

Hello:

I try to use 802.11n in Adhoc, but I'm not sure I have open it or not.

The code is follow, another question is how to check the type of 802.11 in node.

The out put in one station is:

root@ubuntu:/home/tang/sdn_manet_exp# iw dev A-wlan0 link

Joined IBSS 02:ca:ff:ee:ba:01 (on A-wlan0)

SSID: adhocNet

freq: 2412

root@ubuntu:/home/tang/sdn_manet_exp# iw dev A-wlan0 info

Interface A-wlan0

ifindex 133

wdev 0x7200000001

addr 00:00:00:00:00:04

ssid adhocNet

type IBSS

wiphy 114

channel 1 (2412 MHz), width: 20 MHz (no HT), center1: 2412 MHz

txpower 20.00 dBm

multicast TXQ:

qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytestx-packets

0 0 11 0 0 0 0 1080 11

[Ramon Fontes]

You have to set the mode when you create the link:
https://github.com/intrig-unicamp/mininet-wifi/blob/master/examples/adhoc.py#L49

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[GANLIN TANG]

Hello:

I try to setting of

net.addLink(sta1, cls=adhoc, intf='D-wlan0', ssid='adhocNet', mode='n', channel=11, ht_cap='HT40+', **kwargs)

channel = 1(or 6) it will show like:

Traceback (most recent call last):
  File "/home/tang/sdn_manet_exp/topo.py", line 71, in <module>
    topology(sys.argv)
  File "/home/tang/sdn_manet_exp/topo.py", line 49, in topology
    net.addLink(sta1, cls=adhoc, intf='D-wlan0', ssid='adhocNet', mode='n', channel=11, ht_cap='HT40+', **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/mininet_wifi-2.6-py3.10.egg/mn_wifi/net.py", line 658, in addLink
    link = cls(node=node1, **params)
  File "/usr/local/lib/python3.10/dist-packages/mininet_wifi-2.6-py3.10.egg/mn_wifi/link.py", line 1818, in __init__
    self.configureAdhoc()
  File "/usr/local/lib/python3.10/dist-packages/mininet_wifi-2.6-py3.10.egg/mn_wifi/link.py", line 1837, in configureAdhoc
    self.join_ibss(self.ssid, self.format_freq(),
  File "/usr/local/lib/python3.10/dist-packages/mininet_wifi-2.6-py3.10.egg/mn_wifi/link.py", line 233, in format_freq
    return int(format(self.freq, '.3f').replace('.', ''))
TypeError: unsupported format string passed to NoneType.__format__

and if I setting the 

net.addLink(sta1, cls=adhoc, intf='D-wlan0', ssid='adhocNet', mode='n', channel=44, ht_cap='HT40+', **kwargs)

which the channel = 44

the topo is totally same but all node couldn't connect and ping.

And I try to find out how to check the 802.11 type(eg. g, n, ac..) using in each node, but I don't know how to check it.

[GANLIN TANG]

Hello:

Thank for the reply!

According to https://mn-wifi.readthedocs.io/en/latest/usage.html#supported-wireless-modes, 

it could ping successful, but I still don't know how to check the 802.11 type.

In the condition of :

net.addLink(sta1, cls=adhoc, intf='D-wlan0', ssid='adhocNet', mode='n', channel=36, **kwargs)

The output of iw is:

iw dev A-wlan0 link

Joined IBSS 02:ca:ff:ee:ba:01 (on A-wlan0)

SSID: adhocNet

freq: 5180

root@ubuntu:/home/tang/sdn_manet_exp# iw dev A-wlan0 info

Interface A-wlan0

ifindex 382

wdev 0x14d00000001

addr 00:00:00:00:00:04

ssid adhocNet

type IBSS

wiphy 333

channel 36 (5180 MHz), width: 20 MHz (no HT), center1: 5180 MHz

txpower 21.00 dBm

multicast TXQ:

qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytestx-packets

0 0 13 0 0 0 0 1228 13

In the condition of :

net.addLink(sta1, cls=adhoc, intf='D-wlan0', ssid='adhocNet', mode='n', channel=36, ht_cap='HT40+',**kwargs)

The out put of iw is:

root@ubuntu:/home/tang/sdn_manet_exp# iw dev A-wlan0 info

Interface A-wlan0

ifindex 389

wdev 0x15300000001

addr 00:00:00:00:00:04

ssid adhocNet

type IBSS

wiphy 339

channel 36 (5180 MHz), width: 40 MHz, center1: 5190 MHz

txpower 21.00 dBm

multicast TXQ:

qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytes tx-packets

0 0 17 0 0 0 0 1552 17

root@ubuntu:/home/tang/sdn_manet_exp# iw dev A-wlan0 link

Joined IBSS 02:ca:ff:ee:ba:01 (on A-wlan0)

SSID: adhocNet

freq: 5180

Thanks!

[Ramon Fontes]

AFAIK, there is no way to check it via wireless tools such as iw/iwconfig. You may want to check their doc.

To view this discussion visit https://groups.google.com/d/msgid/mininet-wifi-discuss/1bba581e-7dbb-4251-851e-6ef38a590e31n%40googlegroups.com.

[GANLIN TANG]

Hello:

As now, the test result is below:

all of the current pair of mode and channel:

mode=n2 channel=1 mode=n channel=36 mode=ax2 channel=1 # for 2.4GHz mode=ax5 channel=36 mode=ax channel=21

only when the channel equal 1 the node could ping to each other in the scope.

The scrip has been upload, and before the test the test nodes will be setting in the scope like py E.setPosition("131,164,0").

And if add ht_cap='HT40+' to the link setting like:

net.addLink(sta6, cls=adhoc, intf='F-wlan0', ssid='adhocNet', mode=m, channel=c, ht_cap='HT40+',**kwargs)

The throughput which test in xterm by iperf will be limit to 1Mbits/s.

[GANLIN TANG]

Hello Ramon:

Thanks for your help again!

I am reading about one paper, and have some confused about it.

The paper's name is "On the Implementation of a Cross-Layer SDN Architecture for 802.11 MANETs"

In side the paper the topology is like:

I want to ask is that possible that A and D will influenced by E in the CSMA/CA when A->D and D->C, 

and B will not influenced when B->C in mininet-wifi.

I have asked the author, they are working in the real world the anthor is like:

"we used RF fixed attenuators and SMA cables in order to control the range of the nodes. You can see in the image how such a setup can be achieved.

I guess you can achieve something similar in Mininet-WiFi by adjusting the position of nodes and their TX Power."

Is it possible to realize in mininet-wifi?

And I'm really appreciate about your help and patience!!

Thanks again!!

[GANLIN TANG]

Hello:

I have test some condition about the adhoc node throughput.

There are some confused:

In the image E is close to D and within its sensing range(could ping), while E is farther from B and outside its sensing range(can't ping)

In this code scenario, I first activated the E→F transmission, and then, based on that, tested B→C and D→C separately. The distances were set so that D is closer to E and even within its sensing range, while B is farther from E and outside the sensing range. C is at the same distance from both B and D. However, the test results showed no difference in throughput between B→C and D→C.

Shouldn’t D be more affected by CSMA than B? And shouldn't the B->C throughput should larger than D->C?