[Bug 221317] Netmap issue after ixgbe driver update

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221317

--- Comment #2 from Cassiano Peixoto <peixoto.cassiano at gmail.com> ---
(In reply to Eric Joyner from comment #1)
Hi Eric,

You need to use two servers like this:

serverA <ix0>----<ix0> ServerB

On serverA run:
pkt-gen -i ix0 -f rx -p4 -c4

On serverB run:
pkt-gen -i ix0 -f rx

Repeat this process cancelling and starting over many times. You will realize
ix0 changed the state to "no carrier status". After that you need to reboot the
server.

I had this behavior only with 3.1.13-K driver.

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