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Dan, </div>
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How do you have the IP address setup on the ubuntu machine that you are having problems with?
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We had a physical machine running ubuntu. I was using a DHCP reservation to assign it an IP address based on the MAC address of the NIC.
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It would work for a while then we would have trouble accessing it on the network.
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What I discovered is when we had trouble, the IP address and MAC address changed on the computer. When we had trouble, I would log into the ubuntu server and check the ip address on the command line. It would show a different IP address. I would then look up
the new IP address on the windows DHCP server and notice that the MAC address was different than the DHCP reservation I made for it.
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What I ended up doing was configuring the Ubuntu server to use a static IP address, which was a different process than I was used to.
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This article explains how to configure a static IP address by editing a yaml configuration file.
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<a href="https://www.osradar.com/set-a-static-ip-address-ubuntu-20-04/">https://www.osradar.com/set-a-static-ip-address-ubuntu-20-04/</a><br>
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When you experience trouble with it, log into the ubuntu server and check to see what IP address it is getting. If it pulls a different IP address from the DHCP server, you will be able to ping other machines on the LAN and get a response since it does have
an IP address. Anything trying to access the server from the network won't be able to find it if the IP address changed.</div>
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I hope this helps. <br>
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<div class="PlainText">-Ed Liddle <br>
Marysville Public Library<br>
http://marysvillelib.org </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> OPLINTECH <oplintech-bounces@lists.oplin.org> on behalf of Danny Will via OPLINTECH <oplintech@lists.oplin.org><br>
<b>Sent:</b> Thursday, March 17, 2022 12:42 PM<br>
<b>To:</b> 'OPLINTECH (OPLINTECH@lists.oplin.org)' <OPLINTECH@lists.oplin.org><br>
<b>Subject:</b> EXTERNAL: Intermittent network issues</font>
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<p class="x_MsoNormal">Hi all,</p>
<p class="x_MsoNormal"> It’s not often that I’m stumped but…</p>
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<p class="x_MsoNormal">I have a windows 2019 server with 2 virtual machines running Ubuntu Linux server (no GUI installed). Both are 20.0.4.3 but, that really isn’t the important part. Both are running websites. One is a copy of the Meeting Room Booking System
and it runs perfect. The other is a slightly modified copy of Omeka database system that we use as our local history site. Cataloging newspapers, High School yearbooks, Photographs, & just about anything else that is historically worthy of keeping. While it
is getting kind of large, it works fine EXCEPT…</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">From time to time, & without any indication of why, this site cannot be reached. I have tried the WAN address by both FQDN & IP address. I have tried the LAN address (10.66.76.24) to no avail. If I log onto the virtual machine, I can
ping the internal DNS server & any external address (google.com, etc.).</p>
<p class="x_MsoNormal">This comes and goes without rhyme or reason. At this point I am ready to pull out what little hair I have out.
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<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">I thought at 1<sup>st</sup>, that the firewall was the issue, so I changed things around to by-pass the usual firewall. Worked for a little while then it was down again (worked for maybe 2 or 3 hours, just enough time that I left for
home just to hear a short time later we were getting calls about it being down again). So it was not the firewall. I made a small change to the NIC settings on the server. It worked fine after that…for 20 minutes back down.
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<p class="x_MsoNormal">TIA</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Dan Will</p>
<p class="x_MsoNormal">Meigs County District Public Library</p>
<p class="x_MsoNormal"><span style="color:#1F497D">Technology Supervisor</span></p>
<p class="x_MsoNormal"><a href="mailto:danwill@meigslibrary.org"><span style="color:#0563C1">danwill@meigslibrary.org</span></a></p>
<p class="x_MsoNormal">740.992.5813</p>
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