I am facing some issues in setting up a client/ServiceBrowser that works under both Win and Linux.

I have the following set-up:

• Win 7 connected to domain
  • Ethernet config uses IPv4 with Subnet Mask 255.255.255.0
• Ubuntu VM running on the same system in Oracle VirtualBox with Win Ethernet as Bridged Adapter
  enp0s3 Link encap:Ethernet HWaddr 08:00:27:55:62:63 inet addr:10.121.44.95 Bcast:10.121.44.255 Mask:255.255.255.0 inet6 addr: fe80::aa6b:92c:17c4:cfc8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1837029 errors:0 dropped:0 overruns:0 frame:0 TX packets:110395 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:467243091 (467.2 MB) TX bytes:7871423 (7.8 MB)
• The broadcasting systems are running on different Debian systems connected to the network domain

If I run the ServiceBrowser from Windows I don't get any return back. I used the example Browser to test the set-up.
`from zeroconf import ServiceBrowser, Zeroconf

class MyListener(object):

def remove_service(self, zeroconf, type, name):
    print("Service %s removed" % (name,))

def add_service(self, zeroconf, type, name):
    info = zeroconf.get_service_info(type, name)
    print("Service %s added, service info: %s" % (name, info))

zeroconf = Zeroconf()
listener = MyListener()
browser = ServiceBrowser(zeroconf, "_tntsrv._tcp.local.", listener)
try:
input("Press enter to exit...\n\n")
finally:
zeroconf.close()`
Running from withing Ubuntu, it returns all the available services (as expected).

I noticed that if I change HOST_ONLY_NETWORK_MASK from 255.255.255.255 to 255.255.255.0 the opposite happens, where it works under Windows but not under Ubuntu.

This seems to ocurr in line 1603
if addr.get('netmask') != HOST_ONLY_NETWORK_MASK

I'm not experienced enough to find a common ground, but is there any posibility so that it'll work under both systems?