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<blockquote data-quote="RadDave" data-source="post: 1611657" data-attributes="member: 234411">Your computer even just one in the house should be behind a router for many reasons, but before going into details, let me pose some questions to make sure that you indeed have only a cable modem:&nbsp; 1) Are you sure that your 'modem' is not a combo including functions of a router; 2) Do you have a home Wi-Fi network (this would be setup by a router); 3) Do you have other devices (e.g. laptops, iPads, AV equipment, etc.) on the internet; 4) Is your computer cabled to the modem via ethernet; and 5) What is the IP address of your computer (goto the Apple - upper left -&gt; About This Mac -&gt; More Information -&gt; System Report)? Next click on 'Network' and look in the upper right corner, what is the IPv4 number (mine is 10.0.1.2 on my cabled iMac to an Apple Airport Extreme router).Your ISP assigns a public IP address to your modem - if you do not have a router, then your computer should show that same address; however, routers establish a connection between two networks, i.e. the internet &amp; a personal home network; the latter is assigned reserved 'private' IP addresses to your devices - there are 3 reserve ranges shown below - Apple uses the 10.0.x.x; my previous routers (Linksys &amp; Cisco) used 192.168.x.x - let me stop there before going into more about a router.&nbsp; Dave <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />10.0.0.1 to 10.255.255.254172.16.0.1 to 172.31.255.254192.168.0.1 to 192.168.255.254</blockquote>

[QUOTE="RadDave, post: 1611657, member: 234411"] Your computer even just one in the house should be behind a router for many reasons, but before going into details, let me pose some questions to make sure that you indeed have only a cable modem: 1) Are you sure that your 'modem' is not a combo including functions of a router; 2) Do you have a home Wi-Fi network (this would be setup by a router); 3) Do you have other devices (e.g. laptops, iPads, AV equipment, etc.) on the internet; 4) Is your computer cabled to the modem via ethernet; and 5) What is the IP address of your computer (goto the Apple - upper left -> About This Mac -> More Information -> System Report)? Next click on 'Network' and look in the upper right corner, what is the IPv4 number (mine is 10.0.1.2 on my cabled iMac to an Apple Airport Extreme router). Your ISP assigns a public IP address to your modem - if you do not have a router, then your computer should show that same address; however, routers establish a connection between two networks, i.e. the internet & a personal home network; the latter is assigned reserved 'private' IP addresses to your devices - there are 3 reserve ranges shown below - Apple uses the 10.0.x.x; my previous routers (Linksys & Cisco) used 192.168.x.x - let me stop there before going into more about a router. Dave :) 10.0.0.1 to 10.255.255.254 172.16.0.1 to 172.31.255.254 192.168.0.1 to 192.168.255.254 [/QUOTE]

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