udp_echo_server does not work with a single ixgbe card about drv-netif-dpdk HOT 4 CLOSED

No, haven't tested with ixgbe. Now, at that point in init there is nothing specific to the TCP/IP stack going on. If you can get your setup to work with e.g. the test-pmd util, you should easily be able to make the necessary changes to libdpdkif.

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Okay. I managed to modify the code and now udp_echo_server is waiting for a connection to the port 1111:

The IP address of this server (IF_ADDR) is set by calling rump_pub_netconfig_ipv4_ifaddr(), but how does an echo client running on another host know this address? Thanks.

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The client knows because you tell it? I'm not sure I understand the question.

Also, I don't think you should get a "link down" print. Do you have a cable in the right port?

Would you also like to share how you modified the code, in case someone else has a similar problem at a future date.

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