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From
SubjectRe: SO_REUSEPORT and multicasting
--- James Courtier-Dutton <James@superbug.co.uk>
wrote:
> That address is a multicast address, and therefore
> needs to go in the
> multicast routing table, and not the unicast one.
> You are using a command that only modifies the
> unicast table.
>
> James

The broadcasts don't have to leave my PC so I
shouldn't need a multicast router, do I? The client
is running in one terminal window and the server in a
second terminal window.

I checked the router man page and found the following:
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.

If there is another command, will you please tell me
what it is?

Thanks,

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