{"id":225,"date":"2019-02-04T06:56:06","date_gmt":"2019-02-04T06:56:06","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=225"},"modified":"2020-05-01T11:59:07","modified_gmt":"2020-05-01T11:59:07","slug":"nat-instances-nat-gateways","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-solutions-architect-associate-table-of-content\/nat-instances-nat-gateways\/","title":{"rendered":"Network Address Translation (NATs) Instances and NAT Gateways"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li>instance launched into private subnet in VPC could communicate with Internet through the IGW, by default.<\/li><li>Instances within private subnets need direct access to Internet from VPC to<\/li><li>apply security updates<\/li><li>download patches<\/li><li>&nbsp;or update application software.<\/li><li>AWS offers Network Address Translation or NAT Instances and gateways to allow instances in private subnets to access Internet.<\/li><li>Use a NAT gateway instead of a NAT instance<\/li><li>NAT Gateway provides better availability and higher bandwidth, and requires less administrative effort than instances.<\/li><\/ul>\n\n\n\n<p><strong>Network Address Translation Instance<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>It is an Amazon Linux AMI designed to accept traffic from instances within a private subnet<\/li><li>After which, it translate the source IP address to the public IP address of NAT instance<\/li><li>And forwards traffic to IGW<\/li><li>NAT instance maintains state of the forwarded traffic to return response traffic from Internet to instance in private subnet.<\/li><\/ul>\n\n\n\n<p>Tasks to allow instances in a private subnet to access Internet resources through the IGW using NAT, are<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Create \u2013 It required to create a security group for the NAT with outbound rules that specify the needed Internet resources by port, protocol, and IP address.<\/li><li>Launch \u2013 Next launch an Amazon Linux NAT AMI as an instance in a public subnet and associate it with the NAT security group.<\/li><li>Disable \u2013Then disable the Source\/Destination Check attribute of the NAT.<\/li><li>Configure \u2013Then, configure route table associated with a private subnet to direct Internet-bound traffic to NAT instance.<\/li><li>Allocate \u2013 Lastly allocate an EIP and associate it with NAT Instance<\/li><\/ul>\n\n\n\n<p><strong>Network Address Translation Gateway<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>An Amazon managed resource<\/li><li>To operate just like a NAT instance<\/li><li>but is simpler to manage and highly available within an Availability Zone<\/li><li>To allow instances within a private subnet to access Internet resources through the IGW via a NAT gateway, following must be done \u2013\n<ul>\n<li>Configure \u2013 It is required to configure the route table associated with the private subnet to direct Internet-bound traffic to the NAT gateway Example \u2013 nat-1a2b3c4d.<\/li>\n<li>Allocate \u2013 It is required to allocate and EIP and associate it with the NAT Gateway.<\/li>\n<\/ul>\n<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>instance launched into private subnet in VPC could communicate with Internet through the IGW, by default. Instances within private subnets need direct access to Internet from VPC to apply security updates download patches &nbsp;or update application software. AWS offers Network Address Translation or NAT Instances and gateways to allow instances in private subnets to access&#8230;<\/p>\n","protected":false},"author":1,"featured_media":229,"parent":53,"menu_order":11,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[10,7,14,5,22,21],"class_list":["post-225","page","type-page","status-publish","has-post-thumbnail","hentry","category-amazon-aws","tag-amazon-web-services","tag-aws","tag-aws-exam-dumps","tag-aws-solutions-architect","tag-nat-gateway","tag-natinstance"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NAT Instances and NAT Gateways - Testprep Training Tutorials<\/title>\n<meta name=\"description\" content=\"Want to be become AWS Solution Architect - Associate. 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