Hi All,

I am trying to replace my current router (2wire w/ busybox) with routerboard 750g. I am having problem to get the IPTV to work. I checked log on the old router and found following:

<7> May 4 21:19:17 home kern.debug kernel: bb1: add 01:00:5e:48:0a:cc mcast address to master interface
<4> May 4 21:19:18 home kern.warn syslog: Warn: The source address 192.168.1.254 for group 239.255.255.250, is not in any valid net for upstream VIF.
<7> May 4 21:19:20 home kern.debug kernel: bb1: add 01:00:5e:7f:ff:fa mcast address to master interface

i believe bb0 bb1 bb2 so on means the vlan interface. My question is how can i add the mcast mac address in routeros?

Thank you

You can't add multicast mac-address to interface actually. But you can subscribe to multicast group. As I understand you right, you need to recieve IPTV on your computer. So you need to configure PIM routing on your 750.
Look at the example here:
http://wiki.mikrotik.com/wiki/Multicast ... ed_example

my ISP refuse to give me any information on the multicast for the iptv and insist i must use their stupid router

Hmm... I am not very good with MCAST, but you can replace your's MT mac addresses with your crappy router's mac and sniff multicast ip address group for which you are subscribed. With this information you can try to reproduce configuration on MT.
Somebody please correct me if I wrong.

Did this for a french ISP: enable multicast (after installing multicast.npk package on MT router) on the IPTV interface (which may be a bridge of the vlan from your ISP and the ethernet port you plug your IPTV media device in).

Usually, people with same ISP as you have done similar setup with different hardware, it's not that hard (provided you know what a vlan, a bridge and multicast is).