Click on the private subnet and look at the Availability Zone. Now, do the same for the other private subnet.
When you change to the other route table, you’ll see that the destination for 0.0.0.0/0 changes to igw which is the Internet gateway. From the drop down choose the other route table, that’s the Internet gateway, that’s the one that you have wrote down earlier. So click on the E dit route table association on the right. We want the public subnet to use the Internet gateway, not the NAT gateway. But as you can notice below, the destination 0.0.0.0/0 goes through the NAT gateway. If you click on the new subnet now and then click on the Route table tab, you’ll see that AWS created a route table for you. Make sure that your 2nd public Availability Zone is different than the 1st Availability Zone. Choose your VPC, name the subnet (in my case subPublic2), assign an Availability Zone (e.g. Then click on Create subnet in the upper right corner. Remember/write-down the route table id (rtb-0e3cbsomething). When you create the next subnet, you have to put it on another zone.Ĭlick on the Route table tab. Go to Subnets menu click on the public subnet and look at the Availability Zone. Click Create VPC in the bottom right corner. You’ll have to associate the Elastic IP that you created in the previous step to the NAT gateway. I’ll create the other public and private subnet later. As you can see I’ll use 192.168.100.0/24 for the first public subnet and 192.168.102.0/24 for the first private subnet. I’ll use this CIDR (192.168.100.0/22) which gives me 1024 hosts enough for 4 Class C /24 subnets, you can use whatever CIDR you want. You can’t create an ALB with one public subnet.Ĭlick on Launch VPC Wizard in the VPC menu and select VPC with Public and Private Subnets. Minimum two public subnets are needed for the Application Load Balancer. We’ll create a VPC with two public and two private subnets. Go to Elastic IPs under Network & Security in EC2 menu and click on Allocate Elastic IP address in the top right corner.
NAT gateway is needed if you want to give the Web Servers Internet access so they can be patched.
First thing to do is to create an Elastic IP for the NAT gateway.
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