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On 04/08/2022 23:24, <a class="moz-txt-link-abbreviated" href="mailto:mark.yagnatinsky@barclays.com">mark.yagnatinsky@barclays.com</a> wrote:<br>
<blockquote type="cite" cite="mid:MN2PR12MB36162731F151952E20C9048CF99F9@MN2PR12MB3616.namprd12.prod.outlook.com">
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<p class="MsoNormal">I suspect that this is the wrong list;
please redirect me if so.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The docs for this method:<o:p></o:p></p>
<p class="MsoNormal"><a href="https://docs.oracle.com/en/java/javase/18/docs/api/java.base/java/net/InetAddress.html#getLocalHost()" moz-do-not-send="true" class="moz-txt-link-freetext">https://docs.oracle.com/en/java/javase/18/docs/api/java.base/java/net/InetAddress.html#getLocalHost()</a><o:p></o:p></p>
<p class="MsoNormal">say that it “Returns the address of the
local host. This is achieved by retrieving the name of the
host from the system, then resolving that name into an
InetAddress.”<o:p></o:p></p>
<p class="MsoNormal">This is true enough in simple cases, but
horribly misleading in non-trivial cases.<o:p></o:p></p>
<p class="MsoNormal">As far as I can tell it can’t return “the
address” because the local host may have multiple addresses.<o:p></o:p></p>
<p class="MsoNormal">Instead it returns “an address” of the
local host. My laptop right now has 3 addresses: IPv6
loopback, IPv4 from home WiFi, and IPv4 from company network
via VPN.<o:p></o:p></p>
<p class="MsoNormal">As far as I can tell (please correct me if
I’m wrong!!) if there are multiple addresses, the current
implementation makes no effort to pick a more “useful” one.<o:p></o:p></p>
<p class="MsoNormal">Instead, it takes whatever addresses it
gets from the OS and returns the first one.<o:p></o:p></p>
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You need to click through to the Networking Properties to read more
about configuration. The long standing default has been to prefer
IPv4 over IPv6 addresses. The OpenJDK net-dev mailing list is the
place to follow-up on this.<br>
<br>
-Alan<br>
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