{"id":1576,"date":"2024-11-13T04:19:21","date_gmt":"2024-11-13T04:19:21","guid":{"rendered":"https:\/\/learnsysadmin.com\/?post_type=kbe_knowledgebase&#038;p=1576"},"modified":"2024-11-13T12:27:37","modified_gmt":"2024-11-13T12:27:37","slug":"connect-vpcs-via-transit-gateway","status":"publish","type":"kbe_knowledgebase","link":"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/","title":{"rendered":"Connect VPCs via Transit Gateway"},"content":{"rendered":"\n<p class=\"has-medium-font-size wp-block-paragraph\">A <strong>Transit Gateway (TGW)<\/strong> is a fully managed service in AWS that allows you to connect multiple Virtual Private Clouds (VPCs), on-premises networks, and other AWS resources in a scalable and centralized manner. By connecting two VPCs via a Transit Gateway, you can route traffic between them without the need for complex peering relationships or VPN connections.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">In this guide, we&#8217;ll walk through the process of connecting two VPCs using a Transit Gateway in AWS, covering the following key steps:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Creating the Transit Gateway<\/strong><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Attaching the VPCs to the Transit Gateway<\/strong><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Updating the Route Tables<\/strong><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Verifying Connectivity<\/strong><\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Summary of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><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><\/span><\/a><\/span><\/div>\n<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:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#Step_1_Create_a_Transit_Gateway\" title=\"Step 1: Create a Transit Gateway\">Step 1: Create a Transit Gateway<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#Step_2_Attach_VPCs_to_the_Transit_Gateway\" title=\"Step 2: Attach VPCs to the Transit Gateway\">Step 2: Attach VPCs to the Transit Gateway<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#Attach_VPC-A_to_Transit_Gateway\" title=\"Attach VPC-A to Transit Gateway:\">Attach VPC-A to Transit Gateway:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#Attach_VPC-B_to_Transit_Gateway\" title=\"Attach VPC-B to Transit Gateway:\">Attach VPC-B to Transit Gateway:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#Step_3_Update_Route_Tables_in_Each_VPC\" title=\"Step 3: Update Route Tables in Each VPC\">Step 3: Update Route Tables in Each VPC<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#VPC-A_Route_Table\" title=\"VPC-A Route Table:\">VPC-A Route Table:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#VPC-B_Route_Table\" title=\"VPC-B Route Table:\">VPC-B Route Table:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#Step_4_Verify_Connectivity\" title=\"Step 4: Verify Connectivity\">Step 4: Verify Connectivity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#Summary\" title=\"Summary\">Summary<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/#Read_more_about_connecting_VPCs_via_Transit_Gateways_on_AWS_by_clicking_here\" title=\"Read more about connecting VPCs via Transit Gateways on AWS by clicking here\">Read more about connecting VPCs via Transit Gateways on AWS by clicking here<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_1_Create_a_Transit_Gateway\"><\/span>Step 1: Create a Transit Gateway<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Navigate to the VPC Dashboard<\/strong> in the AWS Management Console.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">On the left-hand navigation pane, click on <strong>Transit Gateways<\/strong> under <strong>VPN Connections<\/strong> and then click <strong>Create Transit Gateway<\/strong>.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Fill in the required details:\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Name<\/strong>: A name for your Transit Gateway (e.g., <code>MyTransitGateway<\/code>).<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Description<\/strong>: A brief description (optional).<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Amazon ASN<\/strong>: Choose an Autonomous System Number (ASN). The default 64512 is fine for most use cases.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Default Route Table Association<\/strong>: Decide whether to enable default route table association.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Default Route Table Propagation<\/strong>: Choose whether to enable default propagation to the route table.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Click <strong>Create Transit Gateway<\/strong>.<strong>Screenshot: Create Transit Gateway<\/strong><br>(Insert screenshot here showing the creation of a new Transit Gateway)<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_2_Attach_VPCs_to_the_Transit_Gateway\"><\/span><strong>Step 2: Attach VPCs to the Transit Gateway<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Once the Transit Gateway is created, you can attach your VPCs to it.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Attach_VPC-A_to_Transit_Gateway\"><\/span>Attach VPC-A to Transit Gateway:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Navigate to the <strong>Transit Gateway Attachments<\/strong> page and click <strong>Create Transit Gateway Attachment<\/strong>.<\/li>\n\n\n\n<li>Select <strong>VPC<\/strong> for the attachment type.<\/li>\n\n\n\n<li>Select <strong>VPC-A<\/strong> from the <strong>VPC ID<\/strong> dropdown.<\/li>\n\n\n\n<li>Choose the subnet(s) within VPC-A that will be associated with the Transit Gateway (these subnets should span multiple Availability Zones for fault tolerance).<\/li>\n\n\n\n<li>Click <strong>Create Attachment<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Attach_VPC-B_to_Transit_Gateway\"><\/span>Attach VPC-B to Transit Gateway:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Repeat the same process to attach <strong>VPC-B<\/strong> to the Transit Gateway.<strong>Screenshot: Attach VPC-A and VPC-B<\/strong><br>(Insert screenshot showing attachment creation for both VPCs)<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_3_Update_Route_Tables_in_Each_VPC\"><\/span><strong>Step 3: Update Route Tables in Each VPC<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">To ensure traffic can flow between the VPCs, you must update the route tables in both VPCs.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"VPC-A_Route_Table\"><\/span>VPC-A Route Table:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Go to the <strong>Route Tables<\/strong> section under the <strong>VPC Dashboard<\/strong>.<\/li>\n\n\n\n<li>Select the route table associated with <strong>VPC-A<\/strong>.<\/li>\n\n\n\n<li>Click <strong>Edit Routes<\/strong>, then add a route:\n<ul class=\"wp-block-list\">\n<li><strong>Destination<\/strong>: Enter the CIDR block for <strong>VPC-B<\/strong> (e.g., <code>10.2.0.0\/16<\/code>).<\/li>\n\n\n\n<li><strong>Target<\/strong>: Select <strong>Transit Gateway<\/strong> (e.g., <code>MyTransitGateway<\/code>).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Click <strong>Save Routes<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"VPC-B_Route_Table\"><\/span>VPC-B Route Table:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Similarly, update the route table for <strong>VPC-B<\/strong> by adding a route:\n<ul class=\"wp-block-list\">\n<li><strong>Destination<\/strong>: Enter the CIDR block for <strong>VPC-A<\/strong> (e.g., <code>10.1.0.0\/16<\/code>).<\/li>\n\n\n\n<li><strong>Target<\/strong>: Select <strong>Transit Gateway<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Click <strong>Save Routes<\/strong>.<strong>Screenshot: Update VPC-A and VPC-B Route Tables<\/strong><br>(Insert screenshot showing the route tables for VPC-A and VPC-B)<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_4_Verify_Connectivity\"><\/span><strong>Step 4: Verify Connectivity<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Once the Transit Gateway is set up and the route tables have been updated, it&#8217;s time to verify that the VPCs can communicate.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Launch EC2 Instances<\/strong> in both <strong>VPC-A<\/strong> and <strong>VPC-B<\/strong>. For simplicity, you can use basic Amazon Linux or Ubuntu instances.<\/li>\n\n\n\n<li>Make sure the <strong>security groups<\/strong> and <strong>network ACLs<\/strong> allow inbound and outbound traffic (e.g., allowing ICMP traffic for ping tests).<\/li>\n\n\n\n<li>Log in to the EC2 instance in <strong>VPC-A<\/strong> and attempt to ping the EC2 instance in <strong>VPC-B<\/strong>.If the ping is successful, this confirms that the VPCs are connected via the Transit Gateway.<strong>Screenshot: Test Ping Between EC2 Instances<\/strong><br>(Insert screenshot showing a successful ping test between EC2-A and EC2-B)<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span><strong>Summary<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">By following the above steps, you can successfully connect two VPCs in AWS via a <strong>Transit Gateway<\/strong>. This provides a centralized, scalable solution for routing traffic between multiple VPCs, and you can easily manage network connectivity as your infrastructure grows.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key Benefits of Using a Transit Gateway:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Simplified Network Management<\/strong>: Centralizes routing between multiple VPCs and reduces the need for complex peering setups.<\/li>\n\n\n\n<li><strong>Scalability<\/strong>: Supports large-scale network architectures and inter-VPC traffic routing.<\/li>\n\n\n\n<li><strong>Cost Efficiency<\/strong>: Reduces the need for direct VPC peering connections, saving both cost and configuration time.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This solution is ideal for connecting multiple VPCs in different AWS regions or accounts, or for extending your on-premises network to AWS via a VPN connection.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Additional Notes<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Security Groups and Network ACLs<\/strong>: Ensure these are configured correctly to allow traffic between instances in different VPCs.<\/li>\n\n\n\n<li><strong>Transit Gateway Route Tables<\/strong>: You can configure multiple route tables for fine-grained control over routing decisions between VPCs.<\/li>\n\n\n\n<li><strong>Monitoring<\/strong>: Use <strong>CloudWatch<\/strong> to monitor the traffic through the Transit Gateway and troubleshoot any issues.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">This concludes the process of connecting two VPCs via a Transit Gateway in AWS.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Read_more_about_connecting_VPCs_via_Transit_Gateways_on_AWS_by_clicking_here\"><\/span>Read more about connecting VPCs via Transit Gateways on AWS by clicking <a href=\"https:\/\/docs.aws.amazon.com\/vpc\/latest\/userguide\/extend-tgw.html\">here<\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n","protected":false},"excerpt":{"rendered":"<p>A Transit Gateway (TGW) is a fully managed service in AWS that allows you to connect multiple Virtual Private Clouds (VPCs), on-premises networks, and other AWS resources in a scalable and centralized manner. By connecting two VPCs via a Transit Gateway, you can route traffic between them without the need for complex peering relationships or ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","kbe_taxonomy":[60],"kbe_tags":[],"class_list":["post-1576","kbe_knowledgebase","type-kbe_knowledgebase","status-publish","hentry","kbe_taxonomy-amazon-web-services-aws"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Connect VPCs via Transit Gateway - Learn System Administration<\/title>\n<meta name=\"description\" content=\"AWS - Connect multiple VPCs via Transit Gateway, AWS - VPCs, Transit Gateway and Transit Gateway Attachments\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/connect-vpcs-via-transit-gateway\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Connect VPCs via Transit Gateway - 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