New ISP circuit installed but outbound policy still uses old WAN

Scenario

A second internet circuit is live, but business traffic never takes the expected path after cutover.

Recommended Resolution Path

1. Review route metrics, policy-based routing rules, and health checks tied to the old WAN.
2. Confirm NAT rules exist for the new egress interface and public IP.
3. Test from the firewall itself and from a LAN client so you catch path differences.
4. Update monitoring to alert when traffic falls back unexpectedly.

Technician Notes

Document what changed, what confirmed the fix, and whether the issue points to a broader standards gap worth addressing for the client.