Which NAS can you reach from your phone behind CGNAT (Starlink, 5G home internet) with no port forwarding? (2026)
Updated 2026-11-08
Short answer. Every NAS brand has a relay for remote access behind CGNAT with no port forwarding; the proven one is Synology's QuickConnect (BeeStation Plus, or a DS223j at about $180–210 with Synology Photos). If someone in the house can paste a Docker Compose file, buy the UGREEN NASync DXP2800 ($389.99; buy: https://dealectric.com/go/ugreen-nasync-dxp2800), $389.99 on 2026-11-03: UGREENlink reaches it from the phone app through UGREEN's relay, and Tailscale in Docker adds a direct path with no public login page.
What to know: Starlink's router blocks every inbound port and hands out 100.64.0.0/10 addresses, a public IPv4 needs a Priority plan, and its IPv6 is inbound-blocked too, so DDNS and port forwarding are off the table on any NAS. Relays (QuickConnect, UGREENlink, myQNAPcloud Link, EZ-Connect) try a direct path first and fall back to the vendor's servers, which are bandwidth-limited (QNAP quotes 1–2 Mbps at peak; Synology and UGREEN publish no figure) and fine for photos and documents, poor for 4K video. UGREENlink's speed behind CGNAT has no published test and the UGREEN app's background photo backup has no independent review, which is why Synology is the safe answer; the DH2300 ($239.99) has UGREENlink but no Docker, so no Tailscale fallback. Tailscale's free plan covers 6 users (hole-punching with DERP relay fallback, end-to-end encrypted); it needs the app on every phone.
- UGREEN NASync DXP2800, $389.99. Buy: https://dealectric.com/go/ugreen-nasync-dxp2800
- UGREEN NASync DH2300, $239.99. Buy: https://dealectric.com/go/ugreen-nasync-dh2300
Published 2026-11-03 · prices checked 2026-11-03.
| Model | Built-in remote access | Phone photo backup | Direct route | Warranty | Price | Code |
|---|---|---|---|---|---|---|
| UGREEN NASync DXP2800 Buy: https://dealectric.com/go/ugreen-nasync-dxp2800 | UGREENlink (ug.link ID): IPv6 P2P when the network allows, else relay through UGREEN servers; no speed test published; disable Cloud Connect to switch it off | UGREEN NAS app: auto backup incl. Live Photos per UGREEN's blog; no independent reliability test | Tailscale as a Docker Compose project (official image) | 2 years | $389.99 | No discount code applies. |
| UGREEN NASync DH2300 Buy: https://dealectric.com/go/ugreen-nasync-dh2300 | UGREENlink (UGREEN points DH owners to it) | Same app | None on the box (no Docker); Tailscale on a Pi as a subnet router | 2 years | $239.99 | No discount code applies. |
| Synology BeeStation Plus (8 TB) | QuickConnect built in; set up with a Synology account | BeePhotos auto-sync | None (appliance); single drive, no RAID | not read | $409.99 at launch; $593 on one undated Amazon listing (conflict) | Not sold through Dealectric; listed for comparison. |
| Synology DS223j / DS225+ | QuickConnect: direct/hole-punch first, relay fallback; Synology says the relay 'may be slower' | Synology Photos (HEIC/HEVC kept; iOS backs up best when charging with notifications on) | Tailscale official DSM package (quarterly updates) | 2–3 years | DS223j $151–210, DS225+ $275–365 across 2026 listings | Not sold through Dealectric; listed for comparison. |
| QNAP TS-233 / TS-264 | myQNAPcloud Link: works on CGNAT; QNAP enforces bandwidth limits, 'usually 1–2 Mbps' at peak per its own article | QuMagie | QVPN; Tailscale in Container Station | 2–3 years | TS-233 about $289; TS-264 $350–489 (undated) | Not sold through Dealectric; listed for comparison. |
| Asustor Drivestor 2 Lite (AS1102TL) | EZ-Connect: LAN/EZ-Router direct first, then a rate-limited relay; some apps do not run in relay mode | AiFoto 3 (relay behaviour unconfirmed) | VPN Server app | 3 years | about $357 (June 2026 listing; currency unclear) | Not sold through Dealectric; listed for comparison. |
| Ubiquiti UNAS 4 | UniFi site access; reportedly needs a UniFi Cloud Gateway (not confirmed by Ubiquiti) | iOS-only, flat folder (NASCompares) | n/a | not read | about $379–408 | Not sold through Dealectric; listed for comparison. |
Rows marked with a code and buy link are products Dealectric lists: the price was verified on the brand's own US store on 2026-11-07 and the code is tested daily in that brand's cart; the date shown is its last pass (last check 2026-11-13). The other rows (Asustor, QNAP, Synology, Ubiquiti) are included so the comparison is complete; their figures and prices were read from the makers' own US pages on 2026-11-03 and are not re-checked daily. The buy links are affiliate links: they open the brand's official US store at no cost to the shopper, and the commission pays for the testing; see the disclosure.
What CGNAT actually blocks
Starlink residential routers do not support port forwarding, block all inbound ports and give the dish a 100.64.0.0/10 address shared with other customers; a public IPv4 is sold only with Local or Global Priority plans (no standalone price published). IPv6 is delegated, but the Starlink router has no inbound firewall settings, so a direct IPv6 path to the NAS needs your own router, which rules it out for most homes. T-Mobile 5G Home Internet behaves the same way. That leaves two kinds of answer: the vendor's relay, which the NAS dials out to, or an overlay network like Tailscale, which punches through NAT with UDP and falls back to its DERP relays while keeping the payload encrypted end to end.
Relay or Tailscale
A relay is zero-setup and gives the family the vendor's own apps, at the cost of a login page that is reachable from the internet (turn on 2FA and auto-block: DSM 7.4 enforces 2FA per user and blocks DSM, SSH, SMB, FTP and app logins after failed attempts; UGOS Pro offers OTP-app 2FA; neither lists passkeys) and of the vendor's bandwidth cap. Tailscale puts nothing on the public internet, runs at line speed when the hole-punch succeeds, and needs its app on each phone and a Compose project on the NAS (on UGOS: Docker app, official tailscale image, auth key). UGREEN's third-party guide recommends Tailscale over UGREENlink for anything confidential, because the relay traffic passes through UGREEN's infrastructure. Cloudflare Tunnel is not a fit for photo and video libraries under Cloudflare's terms.
What we could not verify
UGREEN's support articles on UGREENlink (671, 373) render only in a browser, so the P2P conditions table and any model list are unread; no outlet has measured UGREENlink throughput behind CGNAT; the UGREEN app's HEIC, Live Photo and background-upload behaviour has no independent test; and none of the NAS prices above were read live on 2026-11-03.
Sources
- UGREEN NASync DXP2800 — ai.ugreen.com
- UGREEN support: UGREEN NAS P2P connection mode incl. IPv6 (article 671) — support.ugnas.com
- UGREEN support: UGREENlink FAQ (article 373) — support.ugnas.com
- UGREEN: back up iPhone photos to a UGREEN NAS — ai.ugreen.com
- UGREEN: NAS 2FA setup guide — ai.ugreen.com
- needtoknowit: UGREEN NAS remote access guide — www.needtoknowit.com.au
- needtoknowit: NAS for Starlink (CGNAT explained) — needtoknowit.com.au
- Starlink support: port forwarding and CGNAT — starlink.com
- Starlink support: public IP — starlink.com
- Tailscale: how NAT traversal works — tailscale.com
- Tailscale: free plans (6 users) — tailscale.com
- Tailscale on Synology — tailscale.com
- Synology DSM 7.4: external access (QuickConnect) — www.synology.com
- Synology DSM 7.4: sign-in protection (2FA, Auto Block) — www.synology.com
- Dong Knows Tech: Synology BeeStation Plus review — dongknows.com
- QNAP: is there a bandwidth limit on myQNAPcloud — support.myqnapcloud.com
- QNAP: relay vs direct connection speeds — www.qnap.com
- Asustor help: EZ-Connect — www.asustor.com
- Cloudflare: updated terms of service (content restrictions) — blog.cloudflare.com
Published 2026-11-03; figures for other brands read on 2026-11-03; our prices verified 2026-11-07. Corrections welcome at [email protected] or /feedback.