Server Fault
Server Fault

Questions tagged [amazon-vpc]

Amazon Virtual Private Cloud (Amazon VPC) lets you provision a logically isolated section of the Amazon Web Services (AWS) Cloud where you can launch AWS resources in a virtual network that you define

Amazon Virtual Private Cloud (Amazon VPC) lets you provision a logically isolated section of the Amazon Web Services (AWS) Cloud where you can launch AWS resources in a virtual network that you define. For additional information, see:

760 questions
73
votes
5 answers

What is the difference between a public and private subnet in a Amazon VPC?

When I launch a server with a security group that allows all traffic into my private subnet, it displays a warning that it may be open to the world. If it is a private subnet, how can that be?
Developr
  • 1,002
57
votes
6 answers

What is the recommended CIDR when creating VPC on AWS?

I have been creating AWS VPCs and I am wondering if there is a recommended CIDR value when creating VPCs. What are the factors that I must consider when choosing a CIDR and does the CIDR value affect the performance of the network?
Gene Diaz
  • 727
50
votes
5 answers

Can't connect to EC2 instance in VPC (Amazon AWS)

I've taken the following steps: Created a VPC (with a single public subnet) Added an EC2 instance to the VPC Allocated an elastic IP Associated the elastic IP with the instance Created a security group and assigned it to the instance Modified the…
Ryan Lynch
  • 603
37
votes
2 answers

Elastic file system (EFS) mount outside of AWS

I have a server that is outside of AWS. I'd like to be able to mount an EFS volume to it, but I am not sure if that is possible. Perhaps if you create a VPC, and you create a tunnel over VPN? Does anybody know if this is possible?
Adam
  • 481
35
votes
3 answers

Static IP address for outgoing traffic from AWS autoscaling group

I'm going to have a number of EC2 instances in an Elastic Beanstalk autoscaling group in a default subnet in a VPC. The app on these EC2 instances needs to connect to a third party service who uses an IP address whitelist to allow access. So I need…
davidwebster48
  • 463
32
votes
7 answers

How to verify a AWS VPC (S3) endpoint works?

I added a VPC endpoint to my VPC using CloudFormation, and allowed s3 usage. The routes are visible in the AWS console, but not in the local routing tables of the EC2 instances: $ route -n Kernel IP routing table Destination Gateway …
M. Glatki
  • 2,164
28
votes
2 answers

In AWS, how to check which resources are using VPC IP addresses

According to Amazon and my test, a /24 VPC subnet allows for 251 available IP addresses. I have 2 other subnets in that VPC that appear to have no IP's in use by EC2 and the available IPs field indicates that there are only 250 available. I have…
ilanco
  • 383
28
votes
5 answers

How to list all VPC dependencies in AWS CLI?

I want to delete VPC through CLI. But get an error: A client error (DependencyViolation) occurred when calling the DeleteVpc operation: The vpc 'vpc-xxx' has dependencies and cannot be deleted. How can I list all dependencies that prevent me from…
lexsys
  • 2,993
22
votes
3 answers

How to SSH to ec2 instance in VPC private subnet via NAT server

I have created a VPC in aws with a public subnet and a private subnet. The private subnet does not have direct access to external network. So, there is a NAT server in public subnet which forward all outbound traffic from private subnet to outer…
jasonfungsing
  • 405
21
votes
3 answers

Internal DNS inside Amazon AWS VPC

I am getting started on understanding VPC but am not seeing a good internal DNS solution. For example, we're using a non-RDS database server which other servers in the VPC connect to. I would like to connect by name, not IP. Partly this is so I…
Tom Harrison Jr
  • 595
16
votes
2 answers

Is there any way of viewing, in AWS, what ips in a subnet have been allocated?

Is there any way of seeing what ip addresses AWS thinks have been allocated in a subnet? I've run a ping scan, and I've checked our internal ip management software, and there should be more than 8 ips free, however the Network Load Balancer creation…
Some Linux Nerd
  • 3,597
15
votes
3 answers

Working around an AWS network ACL rule limit

At a maximum, a VPC network ACL can have 40 rules applied. I have a list of over 50 IP addresses that I need to explicitly block access to in our systems, over any port and any protocol. This is an ideal purpose for an ACL, but the limit is…
emmdee
  • 2,397
  • 12
  • 43
  • 65
14
votes
3 answers

AWS: NAT Gateway in public subnet. Why?

As I understand it, a public subnet is one that can route traffic to the internet via an Internet Gateway, and a private subnet is one that cannot (can't reach the internet nor it can be reached from it). In order to reach the internet, a private…
Julian
  • 565
14
votes
5 answers

IPv6 support or alternative for aws vpc instances

Recently apple has imposed IPv6 support as mandatory for all its vendors who use its mobile-api and aws vpc doesn't provide IPv6 support. How can I achieve this. I have checked…
Shailesh Sutar
  • 1,607
14
votes
5 answers

Accessing Amazon S3 from a private VPC subnet

If I have a VPC running and some servers located in the private portion of that network that do backend processing by downloading files from amazon s3, can I access S3 internally to get at those files? Or do I have to access the public internet via…
The Internet
  • 513
1
2 3
…
50 51