I have a load balancer created in my VPC with two subnets. Now I want to open a firewall rule from within my company intranet. I have no control over this firewall. But to open a rule on the firewall - the firewall team is accepting only ip addresses and not the DNS names.
But since the IP address of the load balancer keeps changing I can't give it to the firewall team. That's where I am stuck.
How can I open a firewall rule to an AWS load balancer from within my intranet?
You are correct that an Application Load Balancer does not provide static IP addresses.
You might be able to change to a Network Load Balancer:
Elastic Load Balancing creates a network interface for each Availability Zone you enable. Each load balancer node in the Availability Zone uses this network interface to get a static IP address. When you create an Internet-facing load balancer, you can optionally associate one Elastic IP address per subnet.
It is also possible to put a Network Load Balancer in front of an Application Load Balancer to gain the benefits of both.
See: Using static IP addresses for Application Load Balancers | AWS Networking & Content Delivery Blog
Related
I am creating a backend with ECS and I need to have a static IP, for what I understand from the AWS console all internet-facing load balancers are assigned an IP address by AWS, my question is: Will that IP address change? And if I have 2 Availability Zones, both have different IPs?
For internet-facing load balancers, the IPv4 addresses of the nodes are assigned by AWS.
For internal load balancers, the IPv4 addresses are assigned from the subnet CIDR.
Yes, the IPs change sporadically and you're correct that the IP is different in each Availability Zone.
If you need to have static IPs, you could consider fronting an Application Load Balancer with a Network Load Balancer. This would allow an elastic IP to be set for each AZ that the NLB resides and you should still get the benefits of the ALB.
The downsides would be extra cost and latency. I haven't tried this myself so can't vouch for how well it works.
Source: https://aws.amazon.com/blogs/networking-and-content-delivery/application-load-balancer-type-target-group-for-network-load-balancer/
Will that IP address change? And if I have 2 Availability Zones, both have different IPs?
Yes, for application load balancer (ALB), the IPs are not static. If you want static IP for ALB you can add AWS Global Accelerator to it.
Alternatively, use network LB (NLB), which has static IP addresses.
When creating a Network Load Balancer, there is the option to allocate an Elastic IP address per AZ from one of the EIPs available to you. If you don't allocate an EIP, AWS assigns a Static IP per AZ that can be used by applications as the front-end IP of the load balancer. Note that this only applies to the NLB.
Source: https://aws.amazon.com/elasticloadbalancing/network-load-balancer/
I have created 2 VMs (Webserver) in GCP on one region & TCP internal load balancer configured in the same region and created another vm on another region(southeast asia). Now, I am not able to ping load balancer IP but I am able to ping the webserver IP.
Webserver1---region :us-central ----10.128.0.5 &
Webserver2---region: us-central------10.128.0.6 &
Internal load balancer ip----------10.128.0.13
Test machine---region: southeast asia----10.148.0.5
I understand that by "pinging the load balancer " you mean you want to check the healt of the load balancer.However pinging a load balancer is not possible as it is a virtual part of a network and it is not a seperate device.however u can check the health of the load balancer using the instrucctions from the following docs.
https://cloud.google.com/load-balancing/docs/internal/setting-up-internal
hope that was helpful.
GCP internal load balancer by design handles traffic within the same region. As your test machine is in a different region(Southeast-asia), you cannot ping the internal load balancer which is present in the US-CENTRAL1 region.
Internal HTTP(S) Load Balancing distributes HTTP and HTTPS traffic to backends hosted on Compute Engine and Google Kubernetes Engine (GKE). The load balancer is accessible only in the chosen region of your Virtual Private Cloud (VPC) network on an internal IP address.
Kindly refer to the below link for:
Internal TCP/UDP Load Balancing overview :
https://cloud.google.com/load-balancing/docs/l7-internal
Troubleshooting Internal TCP/UDP Load Balancing
https://cloud.google.com/load-balancing/docs/internal/troubleshooting-ilb
I set my load balancer to allow traffic on port 80 to the security group of my EC2 instance, but the load balancer refuses to connect. To do a sanity check, when I allow HTTP traffic from my IP to the load balancer, I'm able to connect seamlessly. I can only access the load balancer from my EC2 instance when I allow all traffic to port 80 on my load balancer. I keep checking back and forth to make sure the security group that the EC2 instance is in is the same as the one that the load balancer should allow, so I know it's not that. What else could be blocking the traffic?
Context: I used a load balancer because I wanted a static address for my EC2 instances to access and I don't want the IP to be dynamic. Basically, behind the load balancer is one coordinator instance that I want to manage jobs for the auto scaling EC2 instances. The load balancer can be internal for the purposes I need it for.
Network traffic between an EC2 instance and a public facing load balancer will go out to the Internet and back, it won't stay within the VPC. Once the request leaves the VPC it loses its association with the source security group, which is why your security group rule isn't working. If the EC2 instance has an Elastic IP address assigned to it, you could try adding that to the load balancer's security group instead.
There is probably a better way to do what you are trying to do without having your EC2 instance access a public load balancer. Perhaps the load balancer could be converted to an internal load balancer? Or maybe there is a better way for this EC2 server to communicate with the resources behind the load balancer directly somehow. You would need to post more information about your system and your desired goal for help with that.
I created an Application Load Balancer in AWS.
How can I assign an Elastic IP address to the application load balancer? I didn't find any IP address in the load balancer description.
An Application Load Balancer cannot be assigned an Elastic IP address (static IP address).
However, a Network Load Balancer can be assigned one Elastic IP address for each Availability Zone it uses.
If you do not wish to use a Network Load Balancer, you can combine the two by putting the Network Load Balancer in front of the Application Load Balancer:
See: Using static IP addresses for Application Load Balancers | Networking & Content Delivery
You can now get global static IPs for your Application Load Balancer directly from the Load Balancer Management Console, either in the creation wizard or in the Integrated services tab. See this blog post.
Another option is to use AWS Global Accelerator:
AWS Global Accelerator
However, it's probably going to be more expensive than using NLB - ALB architecture.
I created an internal network load balancer (NLB) to connect to EC2 instances on a private subnet. I want to restrict access to the EC2 instances only from the network load balancer. I used these instructions https://docs.aws.amazon.com/elasticloadbalancing/latest/network/target-group-register-targets.html#target-security-groups but it did not work.
Basically, I added the IP address of the network interface of the NLB to the security group with my specific port (eg: 8080 10.4.2.9/32) allowed but that did not work. When i switched to all allow (eg: 8080 0.0.0.0/32) it worked, but i do not want other instances to have access to the ec2 instance.
Any ideas on why this is not working?
Thanks
For what you are trying to accomplish, NLB is the wrong load balancer.
NLB is a layer 4 load balancer. This means that the IP address that you see (at the EC2 instance) is the IP address of the client and not the IP address of the load balancer. With NLB you must allow the client's IP address in your security group.
You want a layer 7 load balancer to implement what you want to do (block other systems in your VPC from accessing your EC2 instances directly). This means ALB or the classic ELB.
If you're using a Network Load Balancer, update the security groups
for your target instances, because Network Load Balancers do not
have associated security groups.
If your target type is an IP, add a rule to your security group to
allow traffic from your load balancer to the target IP.
If your target type is an instance, add a rule to your security group to
allow traffic from your load balancer and clients to the target IP.
You can allow traffic in the EC2 instance security group. As your
instance is in private subnet for that you need to lunch load
balancer in the same region but in public subnet.
Know about your use case first.
Best use cases for Network Load Balancer:
When you need to seamlessly support spiky or high-volume inbound TCP
requests.
When you need to support a static or elastic IP address.
If you are using container services and/or want to support more than one
port on an EC2 instance. NLB is especially well suited to ECS (The
Amazon EC2 Container Service).
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