IGMP general Query does't sent to Virtual-Access interface

[aserov]

Hello,

Please help me to solve a problem with multicast over pptp. I have a router with the next simple lab config:

ip multicast-routing

!

vpdn enable

!        

vpdn-group TP_HUB

! Default L2TP VPDN group

! Default PPTP VPDN group

accept-dialin

  protocol any

  virtual-template 1

no l2tp tunnel authentication

!        

interface Loopback1

ip address 1.1.1.1 255.255.255.0

!        

interface GigabitEthernet0/0

ip address 3.3.3.3 255.255.255.0

ip pim dense-mode

!        

interface Virtual-Template1

ip unnumbered Loopback0

peer default ip address pool default

!

ip local pool default 1.1.1.10 1.1.1.19

When clint connect to vpdn thru pptp and run multicast application, it joins to appropriate groupe and start to receiving data, but after group membership expires it stop to receiving data. It because the client do not receive IGMP general query, which router should send.

I turn igmp debugging on and see that router try to send the general query

*Jun  1 11:56:58.511:  IGMP(0): Send v2 general Query on Virtual-Access2.1

*Jun  1 11:56:58.578:  IGMP(0): Send v2 general Query on Virtual-Access2.2

*Jun  1 11:56:58.590:  IGMP(0): Send v2 general Query on Virtual-Access2.3

but I do not see the query on the client side of pptp tunnel. (in captured packets)

Where these packets are lost?

Thanks

[Peter Paluch]

Hello,

Is this a complete configuration of your interfaces? I am somewhat surprised that there is no ip pim command on your Virtual-template interface, meaning that the PIM/IGMP should not run on the interface and the cloned Virtual-Access interfaces at all. Even more interesting is, still, that your debug seems to implicate that the router tries sending the IGMP queries through the Virtual-Access interfaces although there is no IP Multicast activated on the Virtual-template interface... strange. Can you clarify this?

Best regards,

Peter