Billing Direction

Public network billing meters traffic in a specific direction. Egress (outbound) traffic — bytes leaving Zenlayer toward the internet — is what you pay for. Ingress (inbound) traffic is generally not billed; only the 95th-percentile methods look at both directions and take whichever is larger.

Traffic that never leaves Zenlayer's network — VPC-to-VPC, same-region private IP, Cross-Region Network default mesh — is outside public network billing entirely, in any direction. Traffic to another instance's EIP on the platform is different: it leaves Zenlayer's network and comes back, so it's still billed as public traffic. See Instance-to-Instance Traffic and Billing.

Direction by billing method

Billing method	Metered direction
Flat Rate	Egress (outbound)
Data Transfer	Egress (outbound) — inbound is not counted
Bandwidth Cluster	Larger of egress and ingress: billable 95th = max(ingress 95th, egress 95th)

Notes

• Flat Rate and Data Transfer bill on egress only. Inbound traffic is not metered.

• Bandwidth Cluster samples ingress and egress separately, takes each direction's 95th percentile, and bills the larger of the two.