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NAT Gateway vs NAT Instances
Table 1
Feature
NAT Gateway
NAT Instance
1
Management
Managed by AWS
Managed by you (e.g., software updates)
2
Scalability
Elastic scalability up to 45 Gbps
Scale up (instance type) manually and use enhanced networking
3
High Availability
Provides automatic high availability within an AZ and can be placed in multiple AZs
No high availability – scripted/auto-scaled
4
Security
No Security Groups
Need to assign Security Group
5
Bastion Host
Cannot access through SSH
Can use as a bastion host
6
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
7
Port Forwarding
Does not support port forwarding
Can implement port forwarding through manual customization
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