Each NAT gateway specification defines the maximum number of SNAT connections supported by public NAT gateways.
An SNAT connection is defined by a source IP address (EIP), source port (EIP port), destination IP address, destination port, and a transport layer protocol. An SNAT connection uniquely identifies a session.
The throughput for a NAT gateway is indeed the sum of the bandwidths of all the EIPs configured for all DNAT rules. If a public NAT gateway has two DNAT rules with EIP bandwidths of 10 Mbit/s and 5 Mbit/s, its total throughput will be 15 Mbit/s.
A public NAT gateway supports up to 20 Gbit/s of bandwidth.
The default timeout duration of an SNAT connection over TCP is 900 seconds.
The default timeout duration of an SNAT connection over UDP is 300 seconds.
Select a public NAT gateway specification based on your service requirements. Table 1 lists the 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 |