Hi,
You state that the above given route add was needed for a test app, but this is what route's manpage is saying about that exact line:
Quote:
route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0
This is an obscure one documented so people know how to do it. This sets all of the class D (multicast) IP routes to go via "eth0". This is the correct normal configuration line with a multicasting kernel.
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Ok, it is a correct line, strictly speaking, but also obscure.
Do you have a multicasting kernel? If not and you do actually need multicast, take a look here:
Multicast HOWTO
Multicast HOWTO - Kernel section
Hope this helps.
