two network cards and multicast
 

I have two network cards, eth0 and eth1.
please tell me how to configure it so that PC receives UDP from 224.0.0.1 on eth0 and sends UDP on 224.0.0.2 to eth1.
eth0 should not forward 224.0.0.2

thanks.

This should do the job - provided that eth0 is your primary interface and a default route already exists in the main table.

ip route add default dev eth1 table 4
ip rule to 224.0.0.2 table 4

See http://linux-ip.net/gl/ip-cref/