[multicast routing] smcroute problem

Hello.

I'm trying to set multicast routing on linux box running slackware (kernel
2.4.26). After research i found smscroute - exactly what I was looking for
- small program to put static multicast routes to kernel.

Basically what I need is to make some traffic multiplication on LAN
interfaces (802.1q logical interfaces) to send some multicast video stream
to them.
The smscroute worked excellent on my test systems:
- slackware
- debian unstable
When I put some multicast packets on eth0, I could multiplicate this packets
on eth1.2 eth1.3... interfaces by typing:

smcroute -d
smcroute -a eth0 192.168.0.1 239.192.1.1 eth1.2 eth1.3...

after doing tcpdump -ni eth1.2 I could see multicast packets.

But it there are same problems on target box (slackware server with 2 intel
e1000 cards). The test systems and target system have:
- the same kernel (2.4.26)
- the same smcroute binary
- they also have the same number of logical interfaces
- even the same aliases...
- only difference is NIC chipset -
on test systems: 8139too, on target system: e1000

On target system smcroute daemon is running, there are no errors in syslog.
Also,

cat /proc/net/ip_mr_cache
cat /proc/net/ip_mr_vif

shows, that packets are forwarded. But I can't see them via tcpdump.

I don't have aby idea where is the problem. This is driving me nuts, so
please, HELP!

I can't change target server, because it is working correct on its main
function - NAT for clients. It is MSI server Pentium4 CPU 2.40GHz.

I found in google, that somebody had similar problem, here is the link:
http://tinyurl.com/5tx79
but the solution with MTU not working (the MTU are the same on all
interfaces)

thanks for ANY help

regards.

--
Woj