Annoying yes, but I’d argue that’s likely the simplest and most performant approach. At best (IPTables NAT), you’d be adding in an extra network hop to your SMB connections which would effect latency, and SMB is fairly latency sensitive especially for small files. And at worst (Traefik), you’d adding in a user-space layer 7 application that needs to forward every bit of traffic going over your SMB connection.