<p>Yep, that was it, fixed.</p><p><a href="https://github.com/azonenberg/antikernel-ipcores/commit/d1ea3359628a00ea08a2234150b0876159ca4fa2?ts=4" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://</span><span class="ellipsis">github.com/azonenberg/antikern</span><span class="invisible">el-ipcores/commit/d1ea3359628a00ea08a2234150b0876159ca4fa2?ts=4</span></a></p><p>Now I can properly control the thing over the 10G SFP+ port as well as the baseT port. And it properly switches between them (using the SFP if up, then falling back to baseT if not).</p>