How to Resolve Synology DDNS Failures with Dual‑PPPoE and IPSec VPN on vSRX

This guide explains why Synology DSM DDNS stops working when an IPSec VPN default route is active, and provides step‑by‑step commands to add a pp0.0 nexthop and static routes for DDNS‑related subnets so the service remains reliable under both VPN and non‑VPN conditions.

DDNSIPSecPPPoE

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How to Resolve Synology DDNS Failures with Dual‑PPPoE and IPSec VPN on vSRX