UDP network transfers to secondary network adapter

[rp17]

I've searched the forum for UDP traffic issues on Centos6 and 7. I've tried some of the solutions without success.

What we are seeing is that any UDP socket transfers or broadcasts are getting blocked somewhere and are not being allowed into the system when using a secondary network connection. For instance, I can send and receive UDP just fine across eth0 on our primary network, but the software fails to see any packets communicating with systems with an IP address that is not on eth0, but are on eth1 or eth2.

I can see this traffic using wireshark and can capture traffic using libpcap.

I've tried echoing a 0 or a 2 to /proc/sys/net/ipv4/conf/eth2/rp_filter, i've tried echoing 0 to /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts.

We have hardware sending packets to us with either a normal port based UDP transfer in one case or a UDP broadcast in another. Ifconfig shows broadcast enabled on the adapter.

What do I need to do in order to enable this traffic?

Thanks.