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Network Interface Errors - Connect IT Community | Kaseya
<main> <article class="userContent"> <h2 data-id="summary"><strong>SUMMARY</strong></h2> <p>Network Interface Errors</p> <h2 data-id="issue"><strong>ISSUE</strong></h2> <p></p> <h3 data-id="symptoms-description">Symptoms / Description</h3> <p>If you suspect network connection issues caused by overburdening of the Unitrends Network Adapter from high throughput, you may run the command “ethtool -S ethX | egrep 'errors|failed|collisions' | grep '[1-9]'” where ethX is the active port on the Unitrends device and it returns alloc_rx_buff_failed issues then you have a buffer overflow.</p> <h3 data-id="cause">Cause</h3> <p>This is caused by too many requests flooding the Unitrends appliance all at once and can be resolved by allocating more memory to the buffer process. This is a rare issue typically seen if openVPN is used on a very fast connection (approaching or exceeding gigabit speed). </p> <h3 data-id="resolution-workaround-execution-process">Resolution / Workaround / Execution Process</h3> <p>See what the max value of the interface is, using eth0 as an example:<br><br># ethtool -g eth0<br><br>The following is a sample output:</p> <p>Ring parameters for eth0:</p> <p> </p> <p>Pre-set maximums:</p> <p>RX: 1024</p> <p>RX Mini: 0</p> <p>RX Jumbo: 0</p> <p>TX: 1024</p> <p>Current hardware settings:</p> <p>RX: 256</p> <p>RX Mini: 0</p> <p>RX Jumbo: 0</p> <p>TX: 256</p> <p>In this example, <i>1024</i> is the maximum RX and TX buffer size for this particular driver, and the current buffer size is <i>256</i>.<br><br><br><br>Run this command to make the change on the fly, then monitor for some time to see if the issue is resolved:<br><br># ethtool -G eth0 rx 1024 tx 1024</p> <p>To make the change permanent, add the following entry to the bottom of /etc/rc.d/rc.local start-up script:</p> <p># ethtool -G eth0 rx 1024 tx 1024</p> <p> </p> <h3 data-id="third-party-sources">Third-Party Sources</h3> <p><a rel="nofollow" href="/home/leaving?allowTrusted=1&target=http%3A%2F%2Ffirewalltipss.blogspot.com%2F2011%2F06%2Fhow-to-increase-sizes-of-buffer-ring.html">http://firewalltipss.blogspot.com/2011/06/how-to-increase-sizes-of-buffer-ring.html</a></p> <p> </p> </article> </main>