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    <title>topic Re: Dropbox LAN IPs in Settings and Preferences</title>
    <link>https://www.dropboxforum.com/t5/Settings-and-Preferences/We-wish-to-block-all-UDP-fragments-from-entering-our-network/m-p/754672#M17500</link>
    <description>&lt;BLOCKQUOTE&gt;&lt;HR /&gt;&lt;a href="https://www.dropboxforum.com/t5/user/viewprofilepage/user-id/1809998"&gt;@hanky&lt;/a&gt;&amp;nbsp;wrote:&lt;BR /&gt;&lt;P&gt;We wish to block all UDP fragments from entering our network.&amp;nbsp; ... but I need to know the IP address that Dropbox is using so I can add it to an exception list to allow UDP fragments through.&lt;/P&gt;&lt;HR /&gt;&lt;/BLOCKQUOTE&gt;&lt;P&gt;Hi &lt;a href="https://www.dropboxforum.com/t5/user/viewprofilepage/user-id/1809998"&gt;@hanky&lt;/a&gt;,&lt;/P&gt;&lt;P&gt;There is no need to handle in any special way Dropbox UDP packets. &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@FBF7D2AB59A0D6E861EBF6A36F93B7E2/emoticons/1f642.png" alt=":slightly_smiling_face:" title=":slightly_smiling_face:" /&gt; You may block all of them since they never get in or out of your LAN (that's why LAN Sync); just don't prevent them to flow locally. The IP address in use is the same any other discovery service uses - your local broadcast address. &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@41457EF40051AFF130FDBFE21B496926/emoticons/1f609.png" alt=":winking_face:" title=":winking_face:" /&gt; That's it.&lt;/P&gt;&lt;P&gt;Hope this helps.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;PS: local broadcast address: Let's say your machine IP address is 192.168.0.10/24 (e.g. IP mask 255.255.255.0). In such a case your discovery/broadcast IP address is 192.168.0.255 if you need it at all. Simple, right?! &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@076434C4E1EFFB62E51200AD24B6A0A6/emoticons/1f61c.png" alt=":winking_face_with_tongue:" title=":winking_face_with_tongue:" /&gt;&lt;/P&gt;</description>
    <pubDate>Sun, 03 Mar 2024 21:12:16 GMT</pubDate>
    <dc:creator>Здравко</dc:creator>
    <dc:date>2024-03-03T21:12:16Z</dc:date>
    <item>
      <title>We wish to block all UDP fragments from entering our network.</title>
      <link>https://www.dropboxforum.com/t5/Settings-and-Preferences/We-wish-to-block-all-UDP-fragments-from-entering-our-network/m-p/754611#M17498</link>
      <description>&lt;P&gt;We wish to block all UDP fragments from entering our network.&amp;nbsp; Dropbox LAN sync uses UDP port 17500 for discovery but I need to know the IP address that Dropbox is using so I can add it to an exception list to allow UDP fragments through.&lt;/P&gt;</description>
      <pubDate>Mon, 04 Mar 2024 11:47:00 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Settings-and-Preferences/We-wish-to-block-all-UDP-fragments-from-entering-our-network/m-p/754611#M17498</guid>
      <dc:creator>hanky</dc:creator>
      <dc:date>2024-03-04T11:47:00Z</dc:date>
    </item>
    <item>
      <title>Re: Dropbox LAN IPs</title>
      <link>https://www.dropboxforum.com/t5/Settings-and-Preferences/We-wish-to-block-all-UDP-fragments-from-entering-our-network/m-p/754667#M17499</link>
      <description>&lt;BLOCKQUOTE&gt;&lt;HR /&gt;&lt;a href="https://www.dropboxforum.com/t5/user/viewprofilepage/user-id/1809998"&gt;@hanky&lt;/a&gt;&amp;nbsp;wrote:&lt;BR /&gt;
&lt;P&gt;... I need to know the IP address that Dropbox is using so I can add it to an exception list to allow UDP fragments through.&lt;/P&gt;
&lt;HR /&gt;&lt;/BLOCKQUOTE&gt;
&lt;P&gt;I doubt they'll publish that information here, and I doubt it's a single IP address anyway. You can find a list of the official domains that Dropbox uses &lt;A href="https://help.dropbox.com/security/official-domains" target="_blank"&gt;here&lt;/A&gt;, and you can find other information on the IP ranges that Dropbox uses with a &lt;A href="https://www.google.com/search?client=firefox-b-1-d&amp;amp;q=AS19679" target="_self"&gt;search of the net&lt;/A&gt;.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;Your best option, however, would be to analyze the traffic on your own network to determine what IP ranges your clients are connecting to.&lt;/P&gt;</description>
      <pubDate>Sun, 03 Mar 2024 20:18:40 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Settings-and-Preferences/We-wish-to-block-all-UDP-fragments-from-entering-our-network/m-p/754667#M17499</guid>
      <dc:creator>Rich</dc:creator>
      <dc:date>2024-03-03T20:18:40Z</dc:date>
    </item>
    <item>
      <title>Re: Dropbox LAN IPs</title>
      <link>https://www.dropboxforum.com/t5/Settings-and-Preferences/We-wish-to-block-all-UDP-fragments-from-entering-our-network/m-p/754672#M17500</link>
      <description>&lt;BLOCKQUOTE&gt;&lt;HR /&gt;&lt;a href="https://www.dropboxforum.com/t5/user/viewprofilepage/user-id/1809998"&gt;@hanky&lt;/a&gt;&amp;nbsp;wrote:&lt;BR /&gt;&lt;P&gt;We wish to block all UDP fragments from entering our network.&amp;nbsp; ... but I need to know the IP address that Dropbox is using so I can add it to an exception list to allow UDP fragments through.&lt;/P&gt;&lt;HR /&gt;&lt;/BLOCKQUOTE&gt;&lt;P&gt;Hi &lt;a href="https://www.dropboxforum.com/t5/user/viewprofilepage/user-id/1809998"&gt;@hanky&lt;/a&gt;,&lt;/P&gt;&lt;P&gt;There is no need to handle in any special way Dropbox UDP packets. &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@FBF7D2AB59A0D6E861EBF6A36F93B7E2/emoticons/1f642.png" alt=":slightly_smiling_face:" title=":slightly_smiling_face:" /&gt; You may block all of them since they never get in or out of your LAN (that's why LAN Sync); just don't prevent them to flow locally. The IP address in use is the same any other discovery service uses - your local broadcast address. &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@41457EF40051AFF130FDBFE21B496926/emoticons/1f609.png" alt=":winking_face:" title=":winking_face:" /&gt; That's it.&lt;/P&gt;&lt;P&gt;Hope this helps.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;PS: local broadcast address: Let's say your machine IP address is 192.168.0.10/24 (e.g. IP mask 255.255.255.0). In such a case your discovery/broadcast IP address is 192.168.0.255 if you need it at all. Simple, right?! &lt;img class="lia-deferred-image lia-image-emoji" src="https://www.dropboxforum.com/html/@076434C4E1EFFB62E51200AD24B6A0A6/emoticons/1f61c.png" alt=":winking_face_with_tongue:" title=":winking_face_with_tongue:" /&gt;&lt;/P&gt;</description>
      <pubDate>Sun, 03 Mar 2024 21:12:16 GMT</pubDate>
      <guid>https://www.dropboxforum.com/t5/Settings-and-Preferences/We-wish-to-block-all-UDP-fragments-from-entering-our-network/m-p/754672#M17500</guid>
      <dc:creator>Здравко</dc:creator>
      <dc:date>2024-03-03T21:12:16Z</dc:date>
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