{"id":708,"date":"2021-09-03T18:35:01","date_gmt":"2021-09-03T18:35:01","guid":{"rendered":"https:\/\/www.practicallynetworked.com\/?page_id=708"},"modified":"2021-10-05T16:59:58","modified_gmt":"2021-10-05T16:59:58","slug":"separate-your-networks","status":"publish","type":"post","link":"https:\/\/www.practicallynetworked.com\/separate-your-networks\/","title":{"rendered":"Separate Your Networks"},"content":{"rendered":"<p align=\"left\">Although we&#8217;ll cover\u00a0<b><a href=\"https:\/\/www.practicallynetworked.com\/sharemethod.htm\">selecting your sharing method<\/a><\/b>\u00a0later, there is one important thing that you should do when planning to share your Internet connection with your LAN:<\/p>\n<p><span style=\"font-family: Arial; font-size: large;\"><b>Keep\u00a0<i>your<\/i>\u00a0network separated from\u00a0<i>your ISP&#8217;s<\/i>\u00a0network!<\/b><\/span><\/p>\n<p>The key reasons for doing this are security for your LAN and avoiding problems with your ISP.\u00a0 Read\u00a0<b><a href=\"https:\/\/www.practicallynetworked.com\/twonets.htm\">this page<\/a><\/b>\u00a0for more information.<\/p>\n<p>In the typical case of:<\/p>\n<ul>\n<li>\n<p align=\"left\">an Ethernet-based LAN<\/p>\n<\/li>\n<li>\n<p align=\"left\">software-based sharing method<\/p>\n<\/li>\n<li>\n<p align=\"left\">external cable or DSL modem connected via 10\/100BaseT Ethernet<\/p>\n<\/li>\n<\/ul>\n<p>this will mean having two NICs in the\u00a0<b><a href=\"https:\/\/www.practicallynetworked.com\/sharingcable.htm#Server\">Sharing Server<\/a><\/b>.<\/p>\n<p align=\"left\"><b>I recommend\u00a0<big><big>not<\/big><\/big>\u00a0using two of the same exact NIC<\/b>\u00a0(especially 3COM, since users have reported\u00a0<a href=\"https:\/\/www.practicallynetworked.com\/support\/trblshot11.htm\"><b>problems with multiple 3COM NICs<\/b><\/a>). \u00a0 The main reason for this recommendation is that it will be easier for you to tell the NICs apart when you go to configure their Properties in the TCP\/IP Control Panel, and when you run the\u00a0<a href=\"https:\/\/www.practicallynetworked.com\/support\/winipcfg.htm\"><b>winipcfg<\/b><\/a>\u00a0utility.<\/p>\n<p align=\"left\">\n<p align=\"left\"><b><img alt='attentionsml-6136656' src='https:\/\/www.practicallynetworked.com\/wp-content\/uploads\/2021\/09\/attentionsml-6136656.gif' width=\"30\" height=\"30\" border=\"0\" \/>NOTE!<\/b>\u00a0Adding the second NIC is probably the most difficult part of getting your Internet connection shared. \u00a0 Many of the emails that I receive tell long tales of woe and struggle with this step.<\/p>\n<p>Nevertheless, it&#8217;s important that you add that NIC!\u00a0 I&#8217;ve put together\u00a0<a href=\"https:\/\/www.practicallynetworked.com\/support\/twonichelp.htm\"><b>a page to help you through the process<\/b><\/a>, so give it a look.<br \/>\n<img alt='tblspace-2434306' src='https:\/\/www.practicallynetworked.com\/wp-content\/uploads\/2021\/09\/tblspace-2434306.gif' width=\"2\" height=\"5\" border=\"0\" \/><\/p>\n<h4>\n<a name=\"NIC_rules\"><\/a>When you\u00a0<i>don&#8217;t<\/i>\u00a0need a second NIC<\/h4>\n<p>The world of Networking has changed since I first wrote this in 1998.\u00a0\u00a0<b><a href=\"https:\/\/www.practicallynetworked.com\/networking\/alternative_net.htm\">New networking methods<\/a><\/b>\u00a0have appeared, i.e. wireless, phoneline and powerline, and\u00a0<b><a href=\"https:\/\/www.practicallynetworked.com\/pg\/router_guide_index.asp\">inexpensive hardware routers<\/a><\/b>\u00a0have appeared and continue to get even more inexpensive!<\/p>\n<p>These new alternatives create the need for exceptions to the &#8220;Two NIC&#8221; rule, and require a shift in thinking from &#8220;Two NICs&#8221; to &#8220;Two Network Adapters&#8221; in the case of software-based sharing methods.<\/p>\n<p>So here&#8217;s the list of &#8220;Two NIC&#8221; exceptions<br \/>\n(and here&#8217;s hoping that you don&#8217;t get\u00a0<i>totally<\/i>\u00a0confused by this)&#8230;<\/p>\n<p><b>Exception 1: Internal cable or DSL modems<\/b><br \/>\nSince the modem connects directly to your computer&#8217;s internal bus (usually via a PCI slot), you don&#8217;t need a NIC to connect to it.\u00a0 Just one NIC (or phoneline or wireless or powerline network card) in the Sharing server is needed to connect to the LAN.<\/p>\n<p><b>Exception 2: External cable or DSL modems with wireless, phoneline or powerline-based LAN<\/b><br \/>\nIn this case, one Ethernet NIC is needed to connect to the cable\/DSL modem, but since your LAN is not Ethernet based, you don&#8217;t need a second NIC.<\/p>\n<p><b>Exception 3: Hardware router<\/b><br \/>\nThe router handles the job of keeping your LAN separated from your ISP&#8217;s network and also handles sharing the Internet connection.\u00a0 All you need in this case is one NIC per computer.<br \/>\n(When hardware routers or &#8220;residential gateways&#8221; or whatever other term the marketing folks come up with, appear that handle Wireless \/ phoneline \/ powerline connections directly, this exception should be interpreted to be one network-adapter-of-the-proper-flavor per computer.)<\/p>\n<p><b>Exception 4: Multiple IPs<\/b><b><span style=\"font-family: Arial;\"><big><br \/>\n<\/big><\/span><\/b><span style=\"color: #ff0000;\"><b>The only case in which you\u00a0<i>can&#8217;t<\/i>\u00a0create a separate network is if you are using the\u00a0<a href=\"https:\/\/www.practicallynetworked.com\/multiip.htm\">multiple IP address<\/a>\u00a0method of sharing.<\/b>\u00a0<\/span><br \/>\nIn order for the multiple IP address method to work, all computers that require Internet access need to be\u00a0<b><i>connected directly to the ISP&#8217;s network<\/i><\/b>, usually via a hub or switch.<br \/>\nIn the Multiple IP method, you need only\u00a0<b>one NIC per computer<\/b>.<\/p>\n<p><b>Exception 5: External cable or DSL modems connected via USB<\/b><br \/>\nIn this case, one Ethernet NIC is needed to connect to the LAN, but since the cable \/ DSL modem is connected via USB, you don&#8217;t need a second NIC.<br \/>\n<span style=\"font-size: xx-small;\">(Thanks to Jason Aubrey for the tip!)<\/span><\/p>\n<p>Keep this information in mind when\u00a0<b><a href=\"https:\/\/www.practicallynetworked.com\/sharemethod.htm\">selecting your sharing method<\/a><\/b>\u00a0and buying your network hardware.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Although we&#8217;ll cover\u00a0selecting your sharing method\u00a0later, there is one important thing that you should do when planning to share your Internet connection with your LAN: Keep\u00a0your\u00a0network separated from\u00a0your ISP&#8217;s\u00a0network! The key reasons for doing this are security for your LAN and avoiding problems with your ISP.\u00a0 Read\u00a0this page\u00a0for more information. In the typical case of: an Ethernet-based LAN software-based sharing method external cable or DSL modem connected via 10\/100BaseT Ethernet this will mean having two NICs in the\u00a0Sharing Server. I recommend\u00a0not\u00a0using two of the same exact NIC\u00a0(especially 3COM, since users have reported\u00a0problems with multiple 3COM NICs). \u00a0 The main reason <\/p>\n","protected":false},"author":2,"featured_media":5591,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/posts\/708"}],"collection":[{"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/comments?post=708"}],"version-history":[{"count":0,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/posts\/708\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/media\/5591"}],"wp:attachment":[{"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/media?parent=708"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/categories?post=708"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/tags?post=708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}