PIM and IGMP multicast forwarding

Hardware MikroTik hardware general
1

Any idea when multicasting will be enabled in RouterOS and what version?

I have a scenario where an IP-PBX uses multicast data for synchronisation as well as for line identification and conference calls among other things. Currently direct calls function perfectly across the IPSec VPNs setup using version 2.9.29.

Is there any plans for PIM and IGMP multicast forwarding across VPNs or any connection for that matter as many VOIP equipment seems to be using multicast data.

2

not sure when multicast will be available…

can you use a EoIP tunnel to help in the meantime?

Sam

3

I will try, although the preference is for the link to be encrypted, but I’ll see if this works in a test.

A problem would exist in other situations however where we have a RouterOS system terminating on another device, in which case IPSec would be the only choice for interoperability.

4

eoip can be sent down an encrypted ipsec or l2tp/pptp tunnel. We are being forced to do this now to get around mtu / fragmentation issues.

Sam

5

Took a while but I can finally say I’m confident it’s working.

I had to create an eoip tunnel using unique MACs on each router. I then built bridges on the eoip interface as well as the LAN interfaces on the routers at both offices.

Running packet sniffer I can see the PBX address transmitting to the multicast address 224.0.1.59 on the LAN interface of the remote office. So far so good. Someone will be confirming if the features are actually working but I’m confident.

I now need to spend some time discovering how to send this traffic across an IPSec or l2tp encrypted tunnel.

Thanks for your help. I hope this info helps someone else as well.

6

  1. Create an l2tp tunnel from mikrotik to mikrotik. Example addresses for the end points are 1.0.1.1 and 1.0.2.1. The PPP endpoints could be something like 10.0.0.1 and 10.0.0.2.

  2. Once the tunnel is up and you can ping 10.0.0.1 & 2 from each other then setup EoIP.

  3. EoIP - give each router a unique mac. Then use the 10.0.0.1 and .2 addresses as the EoIP endpoints. Using these PPP endpoints will assure that the eoip tunnel goes thru the l2tp tunnel.

from there you can do what you need, bridge lans or whatever.

Sam

7

Thanks for the info .I’ll be trying this as well.