Re: UDP multicast stream and NAT

Linux Advanced Routing and Traffic Control

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>> Hi, my ISP is streaming some local concert using UDP
>> multicasting. I followed the instructions on the site
which
>> described how to set VLC in order to view the stream,
but
>> it didn't work. I am behind a Linux router/firewall
doing
>> NAT. Using google, I quickly found out that the
>> netfilter/conntrack code doesn't support NATing
multicast
>> traffic. I thought about bridging the internet facing
>> interface (eth0) and (one of) the internal interfaces
(the
>> one my computer is plugged into). This way I could set
my
>> IP to be public and no routing/NAT would be done on the
>> Linux box. The only problem is that the box has 2 more
NICs
>> in it and there are other people connected to those NICs
>> that need to use that connection (hence need to be
NATed).
>>
>> Then I tried thinking about a DMZ-like solution where my
>> box would be in the DMZ, but I can't see that working
>> either because I only have one public IP assigned.
>>
>> Can anyone think of any other way for me to be able to
view
>> the stream?
>>
>> Thanks.
>>
> On Fri, 09 Dec 2005 21:13:45 +0200, sophana
<sophana78@xxxxxxxx> wrote:
>
> I have no experience with multicast, but I think you have
to setup a
> multicast router daemon on your router (routed I think)
> Gabriel wrote:
>

I don't think that would be of any help as long as the
netfilter code can't NAT multicast traffic.

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