diff --git a/clusters/prod/kustomization.yaml b/clusters/prod/kustomization.yaml
index 697297f..92ee79c 100644
--- a/clusters/prod/kustomization.yaml
+++ b/clusters/prod/kustomization.yaml
@@ -431,7 +431,22 @@ patches:
       # where these manifests are meant to be proven first.
       - op: replace
         path: /data/BULK_NFS_SERVER
-        value: "TBD-PROD-BULK-NFS-SERVER"
+        # 192.168.2.102 is pfSense's WAN address, which DNATs tcp/2049 through to the Proxmox
+        # host's REAL address 192.168.1.9 on pfSense's LAN. Prod sits on the WAN side and cannot
+        # reach 192.168.1.9 directly, so the cluster mounts the NAT address. Dev is on the LAN and
+        # keeps the base value 192.168.1.9.
+        #
+        # PROVEN from k3s-prod-1 on 2026-09-12, not inferred:
+        #   - mount of 192.168.2.102:/mnt/Storage/plex negotiated nfs4 vers=4.1 proto=tcp
+        #   - a write as uid 1000 succeeded. Tested as 1000 and NOT root deliberately: the export
+        #     carries no_root_squash, so a root write would have passed and proved nothing, while
+        #     LSIO images default to PUID 911 and would have gone Ready then failed every import
+        #     with EACCES. The tree is 0755 1000:3000, so uid 1000 is the only writer.
+        #   - ln() across downloads/ -> tv/ returned link count 2 (same inode), so the arrs get
+        #     real atomic moves instead of silently degrading to copy-then-delete on EXDEV.
+        # pfSense DNATs WITHOUT source NAT (the host logs prod's own node addresses as the peer),
+        # so the ZFS export ACL names 192.168.2.10/.11/.12 directly rather than one translated IP.
+        value: "192.168.2.102"
       # ==========================================================================================
       # OFF-CLUSTER DR TARGET — Cloudflare R2 (operator, 2026-09-05; bucket + token 2026-09-07).
       # ==========================================================================================