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.
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 |
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.
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