What should I enter in "Elastic IP Allocation ID" to create my vpc. Else its asking for NAT instances. But in neither case I am able to create my vpc.
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It appears that you are using the VPC Wizard to create a VPC with Public and Private Subnets.
To allow the Private Subnets to communicate with the Internet, the Wizard will also create either a NAT Instance or a NAT Gateway.
Your screen is currently configuring a NAT Gateway, which requires a static IP address for traffic outbound to the Internet. You can first create an Elastic IP in the VPC console, then select that Elastic IP in the Wizard when creating the VPC.
If you ever delete the VPC, also delete the Elastic IP to avoid charges (0.5c/hour if an Elastic IP is unused).
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In our current VPC we are using and ASG and ALB. We have some public subnets and some private subnets. We would like to be able to connect from time to time, those private subnets to pull some patches out of the internet.
Is my understand that the NAT Gateway requires an EIP. The EIP does not seem to be able to play with the ASG, since it spect an instance/IP. Not sure if the ASG is able to link an EC2 ( can be terminated ) to the EIP.
What changes shall I make to allow those private subnets to access internet, considering my constrains?
Changing the ALB for an ELB is not an option!
The Auto Scaling group is responsible for launching and terminate Amazon EC2 instances. It will also update the Load Balancer's Target Group with any new/removed instances.
A NAT Gateway is used to provide Internet access to resources in Private Subnets. An Elastic IP address is assigned to the NAT Gateway and all requests coming through the NAT Gateway will come from that IP address. The NAT Gateway and Elastic IP address are not used with the Load Balancer or Auto Scaling group -- they are totally independent. All EC2 instances in the Private Subnets will only use their normal Private IP addresses.
I have a Fargate service with one task. From this task I have to interact with a SFTP server managed by an other company, and they need to whitelist my IP.
I've already set a NLB to have a static inbound IP and it's working great, but now I need my outbound IP to static too.
I've read similar questions and they proposed the use of a NAT gateway but it's not working so far.
I have created the NAT gateway, associated it with an Elastic IP and the subnet which hosts the service but it's not working, the outbound IP is still the dynamically allocated one.
What extra steps am I missing?
I have created the NAT gateway, associated it with an Elastic IP and
the subnet which hosts the service
The NAT Gateway needs to be in a public subnet (a subnet with an Internet Gateway attached).
The service needs to be in a private subnet (a subnet with no Internet Gateway, and a route to the NAT Gateway).
The service needs "Assign Public IP" set to false.
There are some servers that are in private subnet and some are in public subnet.
I want to remove nat gateway and make all instances that were in private subnet to get access through internet gateway. Please suggest me the procedure.
When I have added internet gateway and removed Natgateway then started getting API timeout, please suggest me the possible reason for the same.
A "Public Subnet" is defined as a subnet that has a Route Table entry that points to an Internet Gateway.
Thus, if you want instances in the private subnet to have direct access to the Internet via the Internet Gateway, you will need to convert the private subnet into a public subnet. This can be done by adding a Route to the subnet's Route Table that directs traffic with a destination of 0.0.0.0/0 to the Internet Gateway.
Resources in the VPC that need to communicate with the Internet will need to be assigned Public IP addresses. This can be done for existing resources by assigning an Elastic IP address (which is a static IP address). However, there is a limit on the number of Elastic IP addresses available in each region.
Any new Amazon EC2 instances launched can be given a public IP address during launch, so they won't need an Elastic IP address.
As described in the aws VPC scenario 2 page I have a VPC with 2 subnets defined - one private and one public. The private subnet uses a NAT gateway for the outbound traffic (the NAT gateway lives in the public subnet). The public subnet uses an internet gateway for inbound and outbound.
The usage of the NAT gateway requires an ElasticIP to be registered and associated with that NAT. Now, I need a public IP for the EC2 instance I have in the public subnet, that remains static even after restarting the instance, where outside traffic can come into. Do I need to register another ElasticIP for that purpose, or can I reuse the same ElasticIP that I already created for the NAT Gateway?
An Elastic IP address can only be registered to one ENI at a single time. When you create it a mapping is formed to resolve the elastic IP address to a single private address on an ENI (be that a NAT Gateway or an EC2 host).
When you associate an Elastic IP address with an instance, it is also associated with the instance's primary network interface. When you associate an Elastic IP address with a network interface that is attached to an instance, it is also associated with the instance.
You will need to create a new one for your EC2 host, by default you can use 5 elastic IP addresses in a region, if you need more than this you would need to contact Amazon to increase your accounts quota.
For more information take a look at the Elastic IP addresses page.
I working on aws. I created a public subnet which has a network ACL allows all net traffic, and associated with a internet gateway in the route table.
And then I create a ec2 instance without elastic ip and a ec2 instance with elastic ip in it, and the security group also allows all traffic.
I ssh to the instance which has elastic ip. It works well when I run yum update and curl www.baidu.com and so on. But I can't access internet when I ssh to the ec2 instance which has no elastic ip. anyone knows that is why?
For accessing internet from EC2 instance in public subnet using Internet Gateway, the instance needs to have public IP address. Either one can configure the instance to have public IP address or attach EIP.
Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Internet_Gateway.html
If you do not want to attach public IP address for instances with Internet access (consider private subnets), NAT instance and NAT gateway can help.
Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-nat.html
As well as being in a subnet that has a route to an Internet gateway, an instance must have a public IP address to communicate with the outside world (this is distinct from an elastic IP).
You can specify this when launching an instance, if not there is a per subnet setting that controls this. The per subnet setting defaults to false other than default subnets in your default VPC. There are more details in the aws docs.
The problem lies with the gateway connected to the subnet you are using. To check the gateway you are using:
Go to the subnet you are using
Click on the Route table
Under Routes -> Destination look for 0.0.0.0/0 and check the gateway you have for it under Target
Here's how the gateways behave:
Internet Gateway (IGW) allows instances with public IPs to access the internet.
NAT Gateway (NGW) allows instances with no public IPs to access the internet.
This is a good article to help you understand and solve your problem:
https://medium.com/awesome-cloud/aws-vpc-difference-between-internet-gateway-and-nat-gateway-c9177e710af6