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Author Topic: Wireless control and Dante networks  (Read 2557 times)

Helge A Bentsen

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Wireless control and Dante networks
« on: September 20, 2022, 07:40:04 AM »

Is there a way of setting up a wireless AP with DHCP on the wireless side and link local addressing on the cabled side?
I wish to have my computers on Wifi during setup and tuning talking to each other and the Dante devices, then move them over to cables (and turn off the WAP) before show time. Computers are for control only, I'm not trying to send Dante wirelessly.

I tested a few WAPs I had around, all of them "leaks" DHCP into the cabled side of the network.
Add a gateway?
Buy a new WAP that support this?
Or something else I haven't considered?



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Tim McCulloch

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Re: Wireless control and Dante networks
« Reply #1 on: September 20, 2022, 10:16:35 AM »

vLAN and router?
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Helge A Bentsen

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Re: Wireless control and Dante networks
« Reply #2 on: September 20, 2022, 11:11:42 AM »

vLAN and router?

Could be, this is beyond what I've done in terms of networking in the past.
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Russell Ault

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Re: Wireless control and Dante networks
« Reply #3 on: September 21, 2022, 03:22:39 PM »

Is there a way of setting up a wireless AP with DHCP on the wireless side and link local addressing on the cabled side?
I wish to have my computers on Wifi during setup and tuning talking to each other and the Dante devices, then move them over to cables (and turn off the WAP) before show time. Computers are for control only, I'm not trying to send Dante wirelessly.

I tested a few WAPs I had around, all of them "leaks" DHCP into the cabled side of the network.
Add a gateway?
Buy a new WAP that support this?
Or something else I haven't considered?

I feel like I'm missing something here, but let me start with a question: why is it important that your Dante devices use link-local addresses?

-Russ
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Helge A Bentsen

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Re: Wireless control and Dante networks
« Reply #4 on: September 21, 2022, 07:17:31 PM »

I feel like I'm missing something here, but let me start with a question: why is it important that your Dante devices use link-local addresses?

-Russ

Because they’re often not my networks  :)
Think typical rental sotuations where you get a bunch of gear that’s there for one night only.
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Russell Ault

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Re: Wireless control and Dante networks
« Reply #5 on: September 21, 2022, 11:48:12 PM »

Because they’re often not my networks  :)
Think typical rental sotuations where you get a bunch of gear that’s there for one night only.

Okay; that explains why you don't want to use static IPs (which is totally fair), but doesn't quite answer my question. To be more specific, why is it important that your Dante devices not use DHCP addresses?

-Russ
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Helge A Bentsen

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Re: Wireless control and Dante networks
« Reply #6 on: September 22, 2022, 02:12:18 AM »

Okay; that explains why you don't want to use static IPs (which is totally fair), but doesn't quite answer my question. To be more specific, why is it important that your Dante devices not use DHCP addresses?

-Russ

Because I’m sometimes there for setup only.
If I use DHCP I need to leave my network gear behind IME.
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Russell Ault

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Re: Wireless control and Dante networks
« Reply #7 on: September 22, 2022, 02:09:09 PM »

Because I’m sometimes there for setup only.
If I use DHCP I need to leave my network gear behind IME.

Hrm, okay; in that case:
  • What equipment are you typically trying to control?
  • What kinds of computers are you wanting to use wirelessly?

-Russ
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Helge A Bentsen

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Re: Wireless control and Dante networks
« Reply #8 on: September 22, 2022, 07:59:34 PM »

Hrm, okay; in that case:
  • What equipment are you typically trying to control?
  • What kinds of computers are you wanting to use wirelessly?

-Russ

Very often it's a combination of system drive, wireless mics and console(s).
To use todays setup as an example
- d:live console with Dante cards
- 12 channels of Shure Axient digital
- 8 EAW Anna
- 4 EAW Otto
- Windows PC running EAW Resolution
- MacBook pro with Smaart.

Today everything was hardwired, and I didn't bring a Lake for system drive (no guest consoles), but often I add a Lake and a second Windows computer, it runs Smaart/Lake controller and I remote into that from my MacBook. I would love to have my Lake PC and MacBook on wifi and keep the rest on a cabled network.
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Russell Ault

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Re: Wireless control and Dante networks
« Reply #9 on: September 22, 2022, 09:47:14 PM »

Very often it's a combination of system drive, wireless mics and console(s).
To use todays setup as an example
- d:live console with Dante cards
- 12 channels of Shure Axient digital
- 8 EAW Anna
- 4 EAW Otto
- Windows PC running EAW Resolution
- MacBook pro with Smaart.

Today everything was hardwired, and I didn't bring a Lake for system drive (no guest consoles), but often I add a Lake and a second Windows computer, it runs Smaart/Lake controller and I remote into that from my MacBook. I would love to have my Lake PC and MacBook on wifi and keep the rest on a cabled network.

Okay, great, so, next question (which wouldn't have applied if you had mentioned the word "Android"): why is it important that your control devices use DHCP addresses (and not just link-local like everything else)?

-Russ
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Helge A Bentsen

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Re: Wireless control and Dante networks
« Reply #10 on: September 23, 2022, 07:49:01 AM »

Okay, great, so, next question (which wouldn't have applied if you had mentioned the word "Android"): why is it important that your control devices use DHCP addresses (and not just link-local like everything else)?

-Russ

Because I haven't figured out a way where I can remote from a computer to another using link local.
So far I've only managed to get them to see each other using static IP or DHCP.
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Andrew Broughton

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Re: Wireless control and Dante networks
« Reply #11 on: September 23, 2022, 10:44:45 AM »

Never tried this, but my guess is:
Get another router
Turn off the DHCP server on it, and connect a LAN port on it to the Link-Local network
Connect the WAN cable to a LAN connection on your wireless router (that has DHCP enabled)

If the 2nd router has the WAN port set up for DHCP and NAT, then I would think it would "just work". BUT... maybe not... You might have to do some port forwarding or set up a DMZ port on the non-DHCP router. Not sure.

So, you'd need to have 2 routers, 1 for the wireless control connection that has DHCP enabled, and one that has DHCP disabled that does NAT between the wireless router and the Link-Local network.
« Last Edit: September 23, 2022, 10:48:56 AM by Andrew Broughton »
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Andrew Broughton

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Re: Wireless control and Dante networks
« Reply #12 on: September 23, 2022, 11:20:10 AM »

Or maybe just turn of DHCP on your WAN port on the wireless router and connect the WAN port to the link-local network? Might still need port forwarding or DMZ, not sure.


Yeah, just gave it a try, and it doesn't seem to work. I'm probably out of my depth here, but I'm sure there's a way to do this.
« Last Edit: September 23, 2022, 11:41:13 AM by Andrew Broughton »
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Russell Ault

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Re: Wireless control and Dante networks
« Reply #13 on: September 23, 2022, 02:13:04 PM »

Because I haven't figured out a way where I can remote from a computer to another using link local.
So far I've only managed to get them to see each other using static IP or DHCP.

What remote software are you using?

{...} Yeah, just gave it a try, and it doesn't seem to work. {...}

In general, for two devices to talk to each other over an IP network, either (a) the devices must have addresses within the same subnet, or (b) the devices must be linked through one (or more) gateways that know how to find each other. The link-local addressing specification goes one step further than this and specifies that those addresses (as the name suggests) can only be used for local communications (i.e. gateways aren't allowed). This means that any device that has only a link-local IP address is restricted to communicating exclusively with other devices on the same subnet. Put another way, if device A has a link-local IP address then device B must also have a link-local IP address to be able to communicate with it.

Moreover, most of the control software we use in our industry assumes that the control device and the controlled device will us IP addresses within the same subnet. Some of it can be made to work through a gateway, but others (typically those that rely on discovery of some kind) just won't work across subnets, and either way the question is moot as long as the devices in question have link-local addresses.

TL;DR: if you want everything on the network to be able to talk to each other, and if you want to use link-local address for some of those devices, then you need to use link-local addresses for all devices on the network.

-Russ
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Andrew Broughton

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Re: Wireless control and Dante networks
« Reply #14 on: September 23, 2022, 02:19:42 PM »

TL;DR: if you want everything on the network to be able to talk to each other, and if you want to use link-local address for some of those devices, then you need to use link-local addresses for all devices on the network.
But... Isn't that just what a router does? Allows a local network with it's own subnet communicate with another network in a different subnet? e.g. LAN with 192.168.1.xxx addresses communicating with the internet which has xxx.xxx.xxx.xxx addresses.
I thought NAT would take care of the conversion, but I'm not sure how computers on the LAN "see" the WAN IPs without DMZ, port forwarding or "route". This is where I'm out of my depth, as using a DMZ (which I thought opens all ports) didn't seem to work.
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Helge A Bentsen

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Re: Wireless control and Dante networks
« Reply #15 on: September 23, 2022, 02:41:18 PM »

What remote software are you using?


-Russ

Microsoft Remote Desktop for MacOS.
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Russell Ault

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Re: Wireless control and Dante networks
« Reply #16 on: September 23, 2022, 02:49:47 PM »

Microsoft Remote Desktop for MacOS.

Huh, that's strange; what error message do you get when you try the connection?

But... Isn't that just what a router does? Allows a local network with it's own subnet communicate with another network in a different subnet? {...}

Yes, but only if (a) the application supports its traffic being routed and (b) the devices on the subnets in question are all configured with gateway addresses. In this case, the former isn't true about much of the software we use in our industry (if for no other reason than because IP broadcasts are basically un-routable, which we should all be thankful for), and the latter isn't possible if the devices are using link-local IP addresses (link-local really is "all or nothing", and that's by design).

-Russ
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Helge A Bentsen

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Re: Wireless control and Dante networks
« Reply #17 on: September 23, 2022, 03:06:11 PM »

Huh, that's strange; what error message do you get when you try the connection?

Yes, but only if (a) the application supports its traffic being routed and (b) the devices on the subnets in question are all configured with gateway addresses. In this case, the former isn't true about much of the software we use in our industry (if for no other reason than because IP broadcasts are basically un-routable, which we should all be thankful for), and the latter isn't possible if the devices are using link-local IP addresses (link-local really is "all or nothing", and that's by design).

-Russ

No network traffic or similar, can't remember the exact wording.
If I put a static IP or DHCP in there, it's rock solid. Actually super easy to operate the remote PC.

But ok, I'm starting to suspect that what I want might not be possible, so I might have to rethink the whole idea.
Thanks for your input, much appreciated  :)
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Russell Ault

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Re: Wireless control and Dante networks
« Reply #18 on: September 24, 2022, 04:52:33 PM »

No network traffic or similar, can't remember the exact wording.
If I put a static IP or DHCP in there, it's rock solid. Actually super easy to operate the remote PC. {...}

On a purely technical level RDP as a protocol should work just fine with link-local addresses, so it might be worth troubleshooting this more to see if it can be made to work for your particular application.

Another option that might work would be to configure virtual network interfaces on both computers and assign static IP addresses to those interface. This way computer-to-computer communications could use the virtual interfaces and this statically-assigned subnet while computer-to-device communications could continue to use the physical interfaces and link-local subnet. (Note that this doesn't require VLANs: although it's rarely done in practice, there's nothing inherently wrong with having two separate IP subnets operate inside the same Ethernet broadcast domain).

In theory you could go a step further and create two totally-separate physical networks for computer-to-computer traffic and computer-to-device traffic, but such a setup is arguably more complicated and requires more equipment.

-Russ
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brian maddox

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Re: Wireless control and Dante networks
« Reply #19 on: September 24, 2022, 10:40:03 PM »


(Note that this doesn't require VLANs: although it's rarely done in practice, there's nothing inherently wrong with having two separate IP subnets operate inside the same Ethernet broadcast domain).

...
-Russ

I do this sort of thing all the time combining control and Dante networks over the same "broadcast domain". Like all things networking, there is a time and a place, but yes this can work just fine and is sometimes preferable to a more complicated configuration...
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Russell Ault

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Re: Wireless control and Dante networks
« Reply #20 on: September 25, 2022, 05:01:38 PM »

I do this sort of thing all the time combining control and Dante networks over the same "broadcast domain". Like all things networking, there is a time and a place, but yes this can work just fine and is sometimes preferable to a more complicated configuration...

My impression is that most of the arguments again subnets sharing an Ethernet broadcast domain fall under the heading of "IT departments' fanatical obsession with preventing malicious activity" (subtitled "network security considerations that most production networks blithely ignore"). Properly-configured VLANs are very nearly air-gapped, while dividing traffic merely a the Layer 3 level opens the door to "ooh, now let's see what this IP address will let me talk to!", but that's (usually) much less of a consideration for our purposes.

-Russ
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ProSoundWeb Community

Re: Wireless control and Dante networks
« Reply #20 on: September 25, 2022, 05:01:38 PM »


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