NAT Gateway Specifications¶
The NAT gateway performance is determined by the maximum number of SNAT connections supported.
Public NAT Gateway¶
An SNAT connection consists of a source IP address, source port, destination IP address, destination port, and a transport layer protocol. The source IP address is the EIP, and the source port is the EIP port. An SNAT connection uniquely identifies a session.
Throughput is the total bandwidth of all EIPs in DNAT rules. For example, a public NAT gateway has two DNAT rules. The EIP bandwidth in the first DNAT rule is 10 Mbit/s, and that in the second DNAT rule is 5 Mbit/s. The throughput of the public NAT gateway will be 15 Mbit/s.
The default timeout period of an SNAT connection over TCP is 900 seconds.
The default timeout period of an SNAT connection over UDP is 300 seconds.
Select a public NAT gateway based on your service requirements. Table 1 lists the public NAT gateway specifications.
Specifications | SNAT Connections | Bandwidth | Queries Per Second (QPS) |
|---|---|---|---|
Small | 10,000 | 20 Gbit/s | 10,000 |
Medium | 50,000 | 20 Gbit/s | 10,000 |
Large | 200,000 | 20 Gbit/s | 10,000 |
Extra-large | 1,000,000 | 20 Gbit/s | 10,000 |
Note
The PPS of different NAT gateway specifications is the total PPS in both inbound and outbound directions.
If the number of requests exceeds the maximum allowed connections of a public NAT gateway, services will be adversely affected. To avoid this situation, create alarm rules on the Cloud Eye console to monitor the number of SNAT connections.
Private NAT Gateway¶
An SNAT connection consists of a source IP address, source port, destination IP address, destination port, and a transport layer protocol. The source IP address is the transit IP address, and the source port is the port of the transit IP address.
Select a private NAT gateway based on your service requirements. Table 2 lists the private NAT gateway specifications.
Specifications | SNAT Connections | Bandwidth | QPS |
|---|---|---|---|
Small | 2,000 | 200 Mbit/s | 6000 |
Medium | 5,000 | 500 Mbit/s | 9000 |
Large | 20,000 | 2 Gbit/s | 10,000 |
Extra-large | 50,000 | 5 Gbit/s | 10,000 |
Note
If the number of requests exceeds the maximum allowed connections of a private NAT gateway, services will be adversely affected. To avoid this situation, create alarm rules on the Cloud Eye console to monitor the number of SNAT connections.