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NAT Gateway vs NAT Instances
Table 1
Feature
NAT Gateway
NAT Instance
Management
Managed by AWS
Managed by you (e.g., software updates)
Scalability
Elastic scalability up to 45 Gbps
Scale up (instance type) manually and use enhanced networking
High Availability
Provides automatic high availability within an AZ and can be placed in multiple AZs
No high availability – scripted/auto-scaled
Security
No Security Groups
Need to assign Security Group
Bastion Host
Cannot access through SSH
Can use as a bastion host
IP Addressing
Choose the Elastic IP address to associate with a NAT gateway at creation
Use an Elastic IP address or a public IP address with a NAT instance
Port Forwarding
Does not support port forwarding
Can implement port forwarding through manual customization
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