<div dir="ltr"><p class="gmail-sub_section_element_selectors" style="box-sizing:border-box;margin:0px 0px 8px;color:rgb(38,38,38);font-family:intel-clear;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span class="gmail-sub_section_element_selectors" style="box-sizing:border-box">Hi,</span></p><p class="gmail-sub_section_element_selectors" style="box-sizing:border-box;margin:0px 0px 8px;color:rgb(38,38,38);font-family:intel-clear;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span class="gmail-sub_section_element_selectors" style="box-sizing:border-box">I am trying to establish a uni-directional Ethernet link where a singular fiber is used to transmit data to the receiver where both sides use ixgbe as the driver. The Rx of the transmit side and the Tx of the receive side are not physically connected, like in a Data diode scenario. the ethernet controller on both sides is intel 82599.<br></span></p><p class="gmail-sub_section_element_selectors" style="box-sizing:border-box;margin:0px 0px 8px;color:rgb(38,38,38);font-family:intel-clear;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span class="gmail-sub_section_element_selectors" style="box-sizing:border-box">To force links state to UP(as soon as I detach the TX line from one side, both side link status goes DOWN), i set FLU bit in AUTOC register and also I set the speed with LMS bits in the AUTOC register.</span></p><p class="gmail-sub_section_element_selectors" style="box-sizing:border-box;margin:0px 0px 8px;color:rgb(38,38,38);font-family:intel-clear;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span class="gmail-sub_section_element_selectors" style="box-sizing:border-box">Links successfully become UP, but I can not receive UDP packets that are sent from the TX side on the RX side.</span></p><p class="gmail-sub_section_element_selectors" style="box-sizing:border-box;margin:0px 0px 8px;color:rgb(38,38,38);font-family:intel-clear;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span class="gmail-sub_section_element_selectors" style="box-sizing:border-box">Any advice to establish a uni-directional sfp link is appreciated.<br></span></p></div>