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.
Related
We have 10 instances which we deployed the app using the AWS ECS and ELB
Due to security reasons the API allows request only through specific IP whitelisted IP addresses.
So we are planning to pass the request through the proxy
How to route an API request go through a proxy
We are using nginx
Any specific way to route an API request go through a proxy will be helful
You won't need NGINX as a proxy for this use-case, I'd propose to consider looking into using AWS NAT Gateways. NAT Gateway is a highly available AWS managed service that makes it easy to connect to the Internet from instances within a private subnet in an Amazon Virtual Private Cloud (Amazon VPC). Its the perfect place to provide a static IP to all your subnet's outbound traffic.
In order to provide a NAT Gateway with static IP (Elastic IP) for your cluster's outbound traffic. This will allow your different tasks running inside your ECS cluster's private subnets to look like a single requesting entity from an outsider's POV (in your case, the 3rd party API is the outsider). To achieve this, you will have to:
Create 2 route tables (1 for private subnets, 1 for public subnets)
Internet gateway on the public subnet
Elastic IP address
Create a NAT Gateway and attach the elastic IP to it (This will be the IP whitelisted to the 3rd party API)
Ensure that all your tasks are running inside private subnets of the VPC
Add a rule in your route table for your private subnets that redirects outbound 0.0.0.0/0 to the NAT Gateway.
Add a rule in your route table for your public subnets that redirects outbound traffic 0.0.0.0/0 to the internet gateway.
You should consider using NAT Gateway instead. I am assuming you already would have all your containers in a VPC, so you can create a new NAT Gateway within this VPC itself.
You can refer to articles attached below to do this:
https://docs.aws.amazon.com/appstream2/latest/developerguide/add-nat-gateway-existing-vpc.html
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html
Note: NAT Gateways have price associated with them.
If needed, you can use the elastic IP provided by NAT Gateways on your lambdas as well.
I have an application hosted on an EC2 instance in public subnet. To integrate this app with a partner we need to whitelist public IP address of the EC2 instance on partner's firewall.
I want to configure auto-scaling of the application in such a way that outgoing traffic for my application's EC2 instances should be from same single IP address that only needs to be whitelisted on partner's end.
For a private subnet, I know that a NAT Gateway is a solution.
But for instances in a Public Subnet, how this can be achieved? any solution/suggestions will be highly appreciated.
All traffic from the instances will need to be redirected to send via a single resource, such as a proxy or a Gateway.
The simplest solution is as you stated -- configure the subnet to route all Internet-bound traffic to a NAT Gateway or a NAT Instance. All traffic from that instance will then come from a single IP address.
However, configuring the subnet in this way will mean that it is no longer a "public subnet", since a public subnet has Internet-bound traffic sent through an Internet Gateway rather than a NAT. So, it's actually the same as using a private subnet as you suggested in your question.
The only way to do it in a Public Subnet would be to specifically configure your apps to send requests via a proxy server, which would act in a similar way to a NAT Gateway/Instance.
Our aim is to get our Elastic Beanstalk setups to route traffic through a NAT gateway as we require for certain traffic connecting to API's which require IP whitelisting. Rather than make modifications to the current setup, I have created a separate/isolated VPC & EC2 instance to familiarise and test the setup. However I am yet to get the setup working as desired.
Here is the setup
VPC (vpc-77049811) with CIDR of 10.0.0.0/16
Internet gateway (igw-4d4b212a) assigned to mentioned VPC
Subnet (subnet-096d8a53) with CIDR of 10.0.1.0/24
NAT Gateway (nat-00bb49204627de7e6) attached to mentioned subnet and assigned Elastic IP
Route table attached to mentioned VPC and associate with mentioned subnet
1x EC2 Instance assigned to VPC and its own Elastic IP and Disabled Source/Destination Check
Route Table Setup
10.0.0.0/16 local
0.0.0.0/0 igw-4d4b212a
With the above setup, and am able to log into the server and make a curl request to get the servers public IP address (curl icanhazip.com). As soon as I add a rule to the route table for the url's resolved IP's to route through the NAT gateway though, I am unable to ping or request the curl request as it will timeout.
Rules added to route table which do not work
45.63.64.111/32 nat-00bb49204627de7e6
144.202.71.30/32 nat-00bb49204627de7e6
Not sure if I've overlooked something here or maybe I have misunderstood the concept and use cases for the NAT gateway?
This is public IP 45.63.64.111. You need IGW to reach to this traffic.
You either do that by directly redirecting your traffic to IGW
OR
You do that by directing to NAT then further directing that traffic to IGW
Directing to IGW part is missing.
Nat gateway is used for EC2 in private subnets (which does not have IGW attached to it). In scenario above, EC2 is in public subnet so ideally it does not need NAT.
Here is what I would do to use NAT-
1. Place EC2 in private subent. and have a Route table where all outgoing traffic to nat-gateway.
2. Nat-gateway which is in public subnet will forward your traffic to IGW.
It seems like you have misunderstood the purpose of a NAT.
Its purpose is to provide outbound internet access to instances in a private subnet without allowing any inbound connectivity - i.e. a subnet where the routing table does NOT have an entry for:
0.0.0.0/0 igw-4d4b212a
If you want to restrict access from your EC2 instance to specific IP addresses, put your NAT in the public subnet, create a private subnet, and put your instance in the private subnet. Then add the two routes to the route table associated with the private subnet:
45.63.64.111/32 nat-00bb49204627de7e6
144.202.71.30/32 nat-00bb49204627de7e6
If you simply want to restrict access of your EC2 instance to a couple of IP addresses, you can only create routes for those addresses:
45.63.64.111/32 igw-4d4b212a
144.202.71.30/32 igw-4d4b212a
Be aware that with this last option, your instance can be reached from the internet if you have rules open in your security groups.
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.
http://i63.tinypic.com/2akb706.jpg
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).
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