Unable to receive UDP broadcast packets on PPP connection

I am struggling for two days now with no success. I have two modems (do not ask, some special stuff), that uses dial up (PPP) connection. I tried this on windows XP and it works like a charm. I am sending unicast and broadcast UPD packets. If I
repeat that on Windows 7 i can send only unicast data, broadcast packets seems to be lost somewhere. I tried to use Microsoft Network Monitor and I can see that broadcasted packets are being received on my PPP connection. But after that, they are gone. Somewhere
in the kernel. I truly do not understand why. I disabled firewall, antivirus, base filtering engine, tried to log dropped packed in Windows
Filtering Platform, tried clean WIN7 machine and all that with no success.
Here is a sample packet received on interface, but it has newer reach my app:
No. Time Source Destination Protocol Length Info
1 13:20:56.093380000 192.168.1.50 192.168.1.255 UDP 49 Source port: x11 Destination port: x11
Frame 1: 49 bytes on wire (392 bits), 49 bytes captured (392 bits)
Encapsulation type: Ethernet (1)
Arrival Time: May 7, 2014 13:20:56.093380000 Central Europe Daylight Time
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1399461656.093380000 seconds
[Time delta from previous captured frame: 0.000000000 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 0.000000000 seconds]
Frame Number: 1
Frame Length: 49 bytes (392 bits)
Capture Length: 49 bytes (392 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ip:udp:data:vssmonitoring]
[Coloring Rule Name: UDP]
[Coloring Rule String: udp]
Ethernet II, Src: ae:4e:20:00:01:00 (ae:4e:20:00:01:00), Dst: Xerox_00:00:00 (01:00:01:00:00:00)
Destination: Xerox_00:00:00 (01:00:01:00:00:00)
Address: Xerox_00:00:00 (01:00:01:00:00:00)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
Source: ae:4e:20:00:01:00 (ae:4e:20:00:01:00)
Address: ae:4e:20:00:01:00 (ae:4e:20:00:01:00)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IP (0x0800)
Internet Protocol Version 4, Src: 192.168.1.50 (192.168.1.50), Dst: 192.168.1.255 (192.168.1.255)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
Total Length: 34
Identification: 0x0032 (50)
Flags: 0x00
0... .... = Reserved bit: Not set
.0.. .... = Don't fragment: Not set
..0. .... = More fragments: Not set
Fragment offset: 0
Time to live: 126
Protocol: UDP (17)
Header checksum: 0xb817 [correct]
[Good: True]
[Bad: False]
Source: 192.168.1.50 (192.168.1.50)
Destination: 192.168.1.255 (192.168.1.255)
[Source GeoIP: Unknown]
[Destination GeoIP: Unknown]
User Datagram Protocol, Src Port: x11 (6001), Dst Port: x11 (6001)
Source port: x11 (6001)
Destination port: x11 (6001)
Length: 14
Checksum: 0xafd1 [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Data (6 bytes)
0000 34 34 34 34 34 34 444444
Data: 343434343434
[Length: 6]
VSS-Monitoring ethernet trailer, Source Port: 127
Src Port: 127
I am running out of my ideas, if anyone could help, with any idea, please do. I am not sure if this feature is dropped in win7 or not.

Hi,
From your description, you may gather the network monitor traces to ensure which part lost UDP broadcast packets.
Thank you.
Best regards,
Stevens Song
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Unable to receive UDP broadcast packets on PPP connection

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