Updated on 2024-03-30 GMT+08:00

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.

Select a public NAT gateway based on your service requirements. Table 1 lists the public NAT gateway specifications.
Table 1 Public NAT gateway specifications

Specifications

Maximum Number of SNAT Connections

Bandwidth

Small

10,000

20 Gbit/s

Medium

50,000

20 Gbit/s

Large

200,000

20 Gbit/s

Extra-large

1,000,000

20 Gbit/s

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.

Table 2 Private NAT gateway specifications

Specifications

Maximum Number of SNAT Connections

Bandwidth

Small

2,000

200 Mbit/s

Medium

5,000

500 Mbit/s

Large

20,000

2 Gbit/s

Extra-large

50,000

5 Gbit/s

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.