Internet Speed Very Slow

The slow internet connectivity you're experiencing on your company server could be due to several factors:

1. Instance Type: The network performance of EC2 instances varies depending on the instance type. Some smaller or less expensive instance types have lower network performance capabilities. You may want to check if your current instance type is suitable for your needs.

2. Network Configuration: How your instance's network is set up can impact performance. This includes the type of network interface attached to your instance and its configuration.

3. Security Groups and Network ACLs: Overly restrictive security group rules or network ACLs could potentially impact network performance.

4. NAT Gateway: If your instance is in a private subnet and using a NAT Gateway for internet access, this could be a bottleneck. NAT Gateways have limits on the number of simultaneous connections and bandwidth.

5. VPC and Subnet Configuration: Ensure that DNS hostnames and DNS resolution are enabled for your VPC, as these are necessary for proper name resolution.

6. Instance Load: If your instance is under heavy load from other processes or applications, this could impact network performance.

7. External Factors: The slow speed could be due to limitations on the target resource you're connecting to, rather than your AWS infrastructure.

To troubleshoot and potentially improve your network performance:

1. Verify your instance type and consider upgrading if necessary.
2. Check your security group and network ACL settings.
3. If using a NAT Gateway, consider its capacity and potentially add more or distribute the load.
4. Use VPC Flow Logs and CloudWatch metrics to analyze traffic patterns and identify issues.
5. Test connections to various internet endpoints to determine if the slow speed is specific to certain destinations or a general issue.
6. Check the MTU (Maximum Transmission Unit) settings on your instance.

If these steps don't resolve the issue, you may need to contact AWS support for further assistance, as there could be underlying network issues specific to your setup or region.
Sources
Internet Speed Issue on AWS t3.medium Instance | AWS re:Post
Slow internet connection when using NAT Gateway | AWS re:Post
Server internet connection is slower than 2G networks | AWS re:Post