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How to forward multicast packets over TUN device in OpenVPN

Discussion in 'Tomato Firmware' started by sunsina, Mar 5, 2014.

  1. sunsina

    sunsina Reformed Router Member

    I managed to make a site to site OpenVPN routed over TUN device configuration to work properly.

    The OpenVPN server router is (Shibby-116-AIO) is on and the OpenVPN client router (Shibby-116-AIO) is on (Both side have DHCP enabled)

    In the open vpn configuration GUI(Server side) I allowed following options:
    "push lan to clients -> yes"
    "respond to DNS -> yes"
    "Allow client <----> client -> yes".
    I could connect to both side devices when I am either connected to client side or server side.

    But my problem is when I am sitting on the server side (My machine interface IP address is 192.168.4.M) I can not forward UDP Multicast packets to the other side of VPN (client side 192.168.42.yyy) which is in different subnet.

    Since on the client side there is a device that listens to (UDP MC address) I do not know how can I forward the MC packets from server over TUN(routed) OpenVPN to the clients side.

    Shall I modify the routing table, if so what would be the configuration?And which side I have to apply the modifications (Client/Server/Both sides).

    Thanks in advance
  2. gfunkdave

    gfunkdave LI Guru Member

    I think you need a TAP interface to do multicast forwarding over the VPN, no?

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