Hi,
I’ve multiple ethernet adopters:_
1 to main network for internet access
1 for dedicated wired connection to iPad
I would like to select the second 172.xx address for OSC but it is fixed to the first 192.xxxx
On Windows GP binds to 0.0.0.0 which means any address on any interface. Not sure if this also applies to macOS
(Empirically determined).
It should display all active networks. Are you sure your other network is active/enabled?
seems to be I can ping an see ipad
also i’m remote connected with teamviewer on both networks from two devices
well kind of resolved it by changing to another class C address in the 192.168 range now it sees it, not sure why, 172.16.x.x is a valid range and everything else was working fine, just something to watch out for in future for me.
on the plus side I’ve a couple of 2.5 usb adaptors working over cat8, so should be solid 
First of all, 172.x is a class B network – I don’t remember offhand if we check those or we only look for class C addresses.
That said, for a class B network, the subnet mask should typically be 255.255.0.0
@DJAA Just for curiosity: how do you wire your iPad to the Mac?
USB/Lightning directly or with a CC Adpater and an USB/Ethernet Adapter on the iPad side?
Usb-c to ethernet adapters on both ends, with ethrnet cable between
yeh thought 172 would be well away from 192, it works just the same if you give it a class c subnet, that said theres plenty class c 192 ranges, so not a problem really.
thought I could use a thunderbolt bridge and do away with the ethernet cable but ios does not support it, fine between macs though.
In practice network engineers are free to use this range ‘classless’ with any mask from /1 all the way to /32. The only important thing is to make sure that there’s no clash with public addresses (if you are designing a network ‘on the inside’). 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 are all in ‘private’ space and are guaranteed not to clash with public addresses.
Tested with GP using two Window computers: it works as expected:
All together, I don’t think the mask length has anything to do with it, at least in Windows. Of course, you have to set up the subnets the right way, otherwise it becomes a mess.
Yeah, but we’re not network engineers 
Yes, but the question was why GP didn’t display BOTH networks
Ok, but as long as GP binds to 0.0.0.0, it should receive from all connected networks.
Sorry 
