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Help Center/ NAT Gateway/ Service Overview/ NAT Gateway Specifications

NAT Gateway Specifications

Updated on 2025-02-14 GMT+08:00

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.

A public NAT gateway supports up to 20 Gbit/s of bandwidth.

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.
Table 1 Public NAT gateway specifications

Specifications

SNAT Connections

Bandwidth

Packets Per Second (PPS)

Queries Per Second (QPS)

Small

10,000

20 Gbit/s

2,000,000

10,000

Medium

50,000

20 Gbit/s

2,000,000

10,000

Large

200,000

20 Gbit/s

2,000,000

10,000

Extra-large

1,000,000

20 Gbit/s

2,000,000

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.
  • The DNAT rules of a public NAT gateway are irrelevant to the NAT gateway specifications. Up to 200 DNAT rules can be added to a public NAT gateway. To increase the number of DNAT rules, create a service ticket.

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

SNAT Connections

Bandwidth

PPS

QPS

Number of NAT Rules (SNAT Rules+DNAT Rules)

Small

2,000

200 Mbit/s

20,000

6000

20

Medium

5,000

500 Mbit/s

50,000

9000

50

Large

20,000

2 Gbit/s

200,000

10,000

200

Extra-large

50,000

5 Gbit/s

500,000

10,000

500

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.

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