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how to map devices to a "wlan" name

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  how to map devices to a "wlan" name kristoff <kristoff@skypro.be> - 2016-03-19 00:35 +0100
    Re: how to map devices to a "wlan" name Gerrit van den Hanenberg <gvdnh@xs4all.nl> - 2016-03-19 02:20 +0100
      Re: how to map devices to a "wlan" name William Unruh <unruh@invalid.ca> - 2016-03-19 01:37 +0000
        Re: how to map devices to a "wlan" name kristoff <kristoff@skypro.be> - 2016-03-20 19:27 +0100

#3672 — how to map devices to a "wlan" name

Hi,


I want to use a raspberrrypi with two wifi devices (as a meshed-network 
node). They show up a sdevice "wlan0" and "wlan1";

Question:
How is determined what device is given what name? Is there a fixed order 
in this.


(the problem is I want to configure them in /etc/network/interfaces, but 
as one device runs on the 2.4 Ghz band and the other on 5 Ghz band, they 
have a different configuration).


I am looking for a setup which is as generic as possible. (e.d. 
usb-deviceid based, device serial-number ?)


Any idea ???



Cheerio! Kr. Bonne.

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#3673

UDEV normally makes sure they always get the same name 

/etc/udev/rules.d/70-persistent-net.rules the MAC address is used as the 
unique identifier 

kristoff wrote:

> Hi,
> 
> 
> I want to use a raspberrrypi with two wifi devices (as a meshed-network
> node). They show up a sdevice "wlan0" and "wlan1";
> 
> Question:
> How is determined what device is given what name? Is there a fixed order
> in this.
> 
> 
> (the problem is I want to configure them in /etc/network/interfaces, but
> as one device runs on the 2.4 Ghz band and the other on 5 Ghz band, they
> have a different configuration).
> 
> 
> I am looking for a setup which is as generic as possible. (e.d.
> usb-deviceid based, device serial-number ?)
> 
> 
> Any idea ???
> 
> 
> 
> Cheerio! Kr. Bonne.

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#3674

On 2016-03-19, Gerrit van den Hanenberg <gvdnh@xs4all.nl> wrote:
> UDEV normally makes sure they always get the same name 
>
> /etc/udev/rules.d/70-persistent-net.rules the MAC address is used as the 
> unique identifier 
>
> kristoff wrote:
>
>> Hi,
>> 
>> 
>> I want to use a raspberrrypi with two wifi devices (as a meshed-network
>> node). They show up a sdevice "wlan0" and "wlan1";
>> 
>> Question:
>> How is determined what device is given what name? Is there a fixed order
>> in this.
>> 
>> 
>> (the problem is I want to configure them in /etc/network/interfaces, but
>> as one device runs on the 2.4 Ghz band and the other on 5 Ghz band, they
>> have a different configuration).
>> 
>> 
>> I am looking for a setup which is as generic as possible. (e.d.
>> usb-deviceid based, device serial-number ?)
>> 
>> 
>> Any idea ???

The new procedure numbers them according to their address on the pci
bus. Thus you get wlp3s25, or wlp0s6 which are stable, and once you have
figured out the mapping from the random numbers to your particular
device it will stay that way (unless you put them into some other place
on the bus) This was precisely to "solve" the problem you are having. As
stated on the older distros, use the udev rules to assign the number to
a specific name. 

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#3675

Gerrit, William,


Thanks for your replies. it did give me some ideas.

In the end, I found two sollutions.

- patch the linux kernel-mmodule so it gives a different name.

I am patching the module-source anyway as I modifying wifi devices to 
operate on ham-radio frequencies.


- do not use "/etc/network/interfaces" to actually configure the 
devices; but just use them to start an external script and put the 
intelligence in there: determine the type of wifi-device based on 
"iwlist freq" and work from there on.


Thanks!

Cheerio! Kr. Bonne.



On 19-03-16 02:37, William Unruh wrote:
> On 2016-03-19, Gerrit van den Hanenberg <gvdnh@xs4all.nl> wrote:
>> UDEV normally makes sure they always get the same name
>>
>> /etc/udev/rules.d/70-persistent-net.rules the MAC address is used as the
>> unique identifier
>>
>> kristoff wrote:
>>
>>> Hi,
>>>
>>>
>>> I want to use a raspberrrypi with two wifi devices (as a meshed-network
>>> node). They show up a sdevice "wlan0" and "wlan1";
>>>
>>> Question:
>>> How is determined what device is given what name? Is there a fixed order
>>> in this.
>>>
>>>
>>> (the problem is I want to configure them in /etc/network/interfaces, but
>>> as one device runs on the 2.4 Ghz band and the other on 5 Ghz band, they
>>> have a different configuration).
>>>
>>>
>>> I am looking for a setup which is as generic as possible. (e.d.
>>> usb-deviceid based, device serial-number ?)
>>>
>>>
>>> Any idea ???
>
> The new procedure numbers them according to their address on the pci
> bus. Thus you get wlp3s25, or wlp0s6 which are stable, and once you have
> figured out the mapping from the random numbers to your particular
> device it will stay that way (unless you put them into some other place
> on the bus) This was precisely to "solve" the problem you are having. As
> stated on the older distros, use the udev rules to assign the number to
> a specific name.
>
>

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