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Windows 7: No multicast (IGMP reports) on VPN connection

02 Jan 2010   #1

Windows Vista
 
 
No multicast (IGMP reports) on VPN connection

Got an application that listens to (a number of) UDP multicast data streams.
Application works correct on XP and Vista.
On Windows 7 the application also works correct if the PC is directly connected to our (private multicast) network, only not if a VPN connection is used to the network. Th VPN connection itself works fine (i can ping the host machine) but no multicast is received.

Used Microsoft Network Monitor to trace the mulicast messages.
If the PC is connected directly to the network, IGMP Report messages are send if the appliaction is started.
If the VPN connection is used, no IGMP Reports are send. IGMP queries are received from the router but the PC doesn't response with IGMP reports.

Disabled the firewall but this didn't solve the problem.

Any suggestions?

My System SpecsSystem Spec
.

02 Jan 2010   #2

W7 Ultimate 64bit W7 Premium 64bit W7 Premium 32bit WXP Home 32bit
 
 

What kind of VPN? PPTP or IPSec? What kind of multicast? As fas as I know IGMP broadcasts don't traverse VPN tunnels without some kind of routing.
My System SpecsSystem Spec
03 Jan 2010   #3

Windows Vista
 
 

PPTP VPN connection / UDP Multicast
My System SpecsSystem Spec
.


03 Jan 2010   #4

W7 Ultimate 64bit W7 Premium 64bit W7 Premium 32bit WXP Home 32bit
 
 

I believe you need to have a route set to forward packets to the multicast IP address. You may also need to have the VPN set to look for the multicast IP.

By default the VPN is only going to forward IP packets destined for the remote subnet it's configured for.
My System SpecsSystem Spec
17 Jan 2010   #5

Windows Vista
 
 

I don's see why i should add a route
The route informations shows a route to the 224.0.0.0 range (the IGMP report should be send to address 224.0.0.2 for thes routers on the subnet).
Th route information is also the same as on a Vista PC that works correct.
My System SpecsSystem Spec
17 Jan 2010   #6

W7 Ultimate 64bit W7 Premium 64bit W7 Premium 32bit WXP Home 32bit
 
 

What VPN server are using? VPN's won't forward multicast traffic unless they're configured for it. As far as I know you'd have to set the VPN server to support multicast forwarding.
My System SpecsSystem Spec
18 Jan 2010   #7

Windows Vista
 
 

A Cisco router is used as VPN server.
There is no difference between a Vista PC that connects to this server and the Windows 7 PC except that the Windows 7 PC doens't receice any of the multicast messages (apperently not because the Windows 7 PC does't send any IGMP reports)
My System SpecsSystem Spec
18 Jan 2010   #8

W7 Ultimate 64bit W7 Premium 64bit W7 Premium 32bit WXP Home 32bit
 
 

Which model VPN Server? What VPN clients are you using on the Vista and Windows 7 machines? Microsoft or Cisco?
My System SpecsSystem Spec
21 Jan 2010   #9

Windows Vista
 
 

A cisco 3845 is used as server and the Windows VPN client is used
My System SpecsSystem Spec
21 Jan 2010   #10

 

This might help:

Enabling IP multicast: Networking and Communications

The following netsh commands display multicast group tables and troubleshooting information for interfaces.
  • netsh routing ip show mfe displays the entries in the multicast forwarding table.
  • netsh routing ip show mfestats displays packet statistics and input and output interface information for multicast forwarding entries in the multicast forwarding table.
  • netsh interface ip show joins displays the multicast groups locally joined on each interface.
My System SpecsSystem Spec
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 No multicast (IGMP reports) on VPN connection




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