Stable egress IPs for multi-region outbound traffic
WHAT IT TESTS: controlling egress IPs at scale. OUTLINE: route outbound traffic through NAT gateways with allocated static IPs, or centralize egress so all regions exit through a fixed small IP set you can whitelist.
WHAT IT TESTS: designing predictable egress identity across regions for IP allowlisting. ANSWER OUTLINE: outbound traffic must exit through a controlled set of static IPs rather than ephemeral instance addresses; route each region's traffic through NAT gateways bound to allocated elastic IPs, or centralize egress through a shared inspection or egress VPC so all regions exit via one fixed, small pool that the third party whitelists. Keep the IP set small and stable, and document it.
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- #networking
- #nat-gateway
- #egress
- #multi-region
- #cloud
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