{"id":1040,"date":"2016-12-04T00:00:00","date_gmt":"2016-12-04T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2016\/12\/04\/the-pros-and-cons-to-azure-s-vnet-peering\/"},"modified":"2023-01-15T22:47:12","modified_gmt":"2023-01-15T22:47:12","slug":"the-pros-and-cons-to-azure-s-vnet-peering","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html","title":{"rendered":"The Pros and Cons to Azure&#8217;s VNet Peering"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-662650ff1e946\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662650ff1e946\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html\/#Introduction\" title=\"Introduction\">Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html\/#What_is_VNET_Peering\" title=\"What is VNET Peering?\">What is VNET Peering?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html\/#Pros\" title=\"Pros\">Pros<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html\/#Cons\" title=\"Cons\">Cons<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html\/#Summary\" title=\"Summary\">Summary<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html\/#Resources\" title=\"Resources\">Resources<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introduction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The other day I was asked to design a solution that required <a href=\"https:\/\/www.fir3net.com\/Cloud\/AZURE\/microsoft-azure-virtual-networks-vnets.html\">VNet<\/a> peering, after some further digging and research into this feature I thought I&#8217;d share some of my findings with you all.<br \/>\nBefore we dive into the pros and cons, lets take a moment to quickly recap on what VNet peering actually is.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_VNET_Peering\"><\/span>What is VNET Peering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>VNet peering<\/strong> is a fairly new feature &#8212; introduced August 2016 &#8212; within Microsoft Azure that connects two VNets, providing low latency and high speed connectivity between your Azure virtual networks.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pros\"><\/span>Pros<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Let us first look at the <strong>pros <\/strong>to VNet peering,<\/p>\n<ul>\n<li><strong>Subscriptions<\/strong> &#8211; VNets within different subscriptions can be linked. This can be useful in situations in which a single organization has multiple Azure subscriptions for budgetary or logistical reasons<sup>[1]<\/sup>.<\/li>\n<li><strong>Latency<\/strong> &#8211; Traffic routes through the internal Azure backbone, allowing low latency. The network latency for a round trip between two virtual machines in peered virtual networks is the same as for a round trip within a local virtual network<sup>[2]<\/sup>.<\/li>\n<li><strong>Bandwidth<\/strong> &#8211; There isn&#8217;t any additional restriction on bandwidth. The network throughput is <em>only<\/em> limited based on the virtual machines permitted bandwidth.<\/li>\n<li><strong>ARM to ASM<\/strong> &#8211; ASM (Azure Service Management) aka classic VNets can be peered with ARM (Azure Resource Manager) VNets. However they must both be in the same subscription.<\/li>\n<li><strong>Cost<\/strong> &#8211; There is a small cost for ingress\/egress traffic ; \u00a30.0061 per GB ingress and \u00a30.0061 per GB egress. Far cheaper then the traditional alternative of a VPN connection between each of the VNets.<\/li>\n<li><strong>NSG<\/strong> &#8211;\u00a0Network Security Groups (NSGs) are supported, providing you with the ability to deny\/permit both ingress and egress traffic.<\/li>\n<li><strong>Transitive Routing<\/strong> &#8211; Transitive routing*, though not enabled by default can be enabled via the &#8220;<em>Allow Forwarded Traffic<\/em>&#8221; option, within the spoke VNet. This configuration option is necessary when configuring virtual networking appliances within your hub VNet, so that <em>transit<\/em> traffic can route through the hub.<\/li>\n<li><strong>Gateway Transit<\/strong> &#8211; Traffic can be routed though the gateway (VPN\/ExpressRoute) of a peered VNet. This provides the ability to build hub and spoke based topologies, where the spoke VNets all use the gateway of the hub.<\/li>\n<\/ul>\n<p><picture><source srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1.avif 941w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1-300x189.avif 300w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1-768x484.avif 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" type=\"image\/avif\"><source srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1.webp 941w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1-300x189.webp 300w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1-768x484.webp 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" type=\"image\/webp\"><img src=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1.png\" height=\"441\" width=\"700\" srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1.png 941w, https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1-300x189.png 300w, https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpoke_1-768x484.png 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" class=\" size-full wp-image-1038 sp-no-webp\" alt=\"VNetPeeringHubSpoke 1\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/p>\n<p>*An example of transitive routing is when you have VNet A connected to VNet B. VNet B is connected to VNet C. For traffic from VNet A to reach VNet C traffic would to be <em>transitively routed<\/em> via VNet B.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cons\"><\/span>Cons<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>And now for the <strong>cons<\/strong>,<\/p>\n<ul>\n<li><strong>Different Regions<\/strong> &#8211; Each VNet peer must reside within the same region.<\/li>\n<li><strong>Overlapping Address Space<\/strong> &#8211; Each VNet peer should not have an overlapping IP address space.<\/li>\n<li><strong>ASM to ASM<\/strong> &#8211; ASM (Azure Service Management) to ASM (Azure Service Management) VNets cannot be peered.<\/li>\n<li><strong>Remote Gateway<\/strong> &#8211;\u00a0 A VNet that is using the remote gateway of a peered VNet cannot have a local gateway configured as well. In other words a single virtual network can have only one gateway. It can either be a local gateway or a remote gateway (in the peered virtual network)<sup>[2]<\/sup>.<br \/>\nWhy does this matter? Each VNet can have a maximum of a SINGLE policy VPN gateway assigned. Now, lets imagine you need to connect multiple remote offices into a single VNet, with each remote office only supporting policy based VPNs (think Cisco ASA). Being able to configure multiple remote gateways would allow you to place each of your policy VPN gateways into different VNets, or in other words build a reverse hub and spoke based topology (below is an example).<br \/>\n<picture><source srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1.avif 962w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1-300x188.avif 300w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1-768x482.avif 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" type=\"image\/avif\"><source srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1.webp 962w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1-300x188.webp 300w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1-768x482.webp 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" type=\"image\/webp\"><img src=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1.png\" height=\"440\" width=\"700\" srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1.png 962w, https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1-300x188.png 300w, https:\/\/www.fir3net.com\/wp-content\/uploads\/2016\/12\/images_articles_VNetPeeringHubSpokeReverse_1-768x482.png 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" class=\" size-full wp-image-1039 sp-no-webp\" alt=\"VNetPeeringHubSpokeReverse 1\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>VNet peering does come with some cons, mainly the inability to configure multiple remote gateways per VNet. However, there are many pros, such as cost reduction on traditional peering methods, low latency and the ability to perform transitive routing. To summarize VNet peering is a great option over traditional VNet to VNet VPN methods, and is something you should be fully aware of when designing your Azure cloud environments.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Resources\"><\/span>Resources<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>[1] <a href=\"https:\/\/www.petri.com\/connect-two-azure-resource-manager-virtual-networks-using-vnet-peering\" class=\"broken_link\">https:\/\/www.petri.com\/connect-two-azure-resource-manager-virtual-networks-using-vnet-peering<\/a><br \/>\n[2] <a href=\"https:\/\/docs.microsoft.com\/en-us\/azure\/virtual-network\/virtual-network-peering-overview\">https:\/\/docs.microsoft.com\/en-us\/azure\/virtual-network\/virtual-network-peering-overview<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction The other day I was asked to design a solution that required VNet peering, after some further digging and research into this feature I thought I&#8217;d share some of my findings with you all. Before we dive into the pros and cons, lets take a moment to quickly recap on what VNet peering actually &#8230; <a title=\"The Pros and Cons to Azure&#8217;s VNet Peering\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html\" aria-label=\"Read more about The Pros and Cons to Azure&#8217;s VNet Peering\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":1037,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Pros and Cons to Azure&#039;s VNet Peering - Fir3net<\/title>\n<meta name=\"description\" content=\"Introduction The other day I was asked to design a solution that required VNet peering, after some further digging and research into this feature I\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fir3net.com\/Cloud\/Azure\/the-pros-and-cons-to-azure-s-vnet-peering.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Pros and Cons to Azure&#039;s VNet Peering - 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