Dynamic ports cause repeated setup
STUN/P2P can expose the current mapped port, but that port may change. Many clients are not designed for frequent manual port edits.
STUN/P2P dynamic port helper for iSCSI
Stop checking ports every day. Keep iSCSI on one stable local entry.
As public IPv4 access disappears, STUN/P2P hole punching can discover NAT mapped ports and build direct peer-to-peer paths without relay traffic. The problem is that mapped ports can change daily. ZsLink currently focuses on iSCSI: it resolves the latest port and exposes it as a fixed local connection.
- Version
- V0.2
- Updated
- 2026-08-20
- Platform
- macOS 13+
- Current scope
- iSCSI
Stable local entry
127.0.0.1:18082
Dynamic public mapping
data.example.com:49728
Resolve redirect port
HTTP Location
Refresh forwarding
Watch & Restart
No client reconfiguration
Stable Local Port
Context
Ports may change, but clients need one stable entry.
ZsLink does one job
It turns the changing remote port into a stable local entry. Clients keep using the local address while ZsLink follows remote changes.
Current product boundary
Currently focused on iSCSI. Local browser access and Synology Drive Client have been verified. Other clients should be checked by actual behavior.
How it works
One local entry, with ZsLink following the remote port.
Clients use one fixed local entry
Your iSCSI client, local browser, or Synology Drive Client connects to a fixed local address and port instead of repeatedly editing remote ports.
ZsLink checks the dynamic address
ZsLink reads the configured dynamic address, gets the current remote port, and shows the current target plus the latest check result.
Keep the entry running in the background
After closing the main window, ZsLink stays in the menu bar. When the port changes, status and logs help confirm the connection.
Guide
Complete first setup in three steps.
-
01
Step 1: Download and open
Download the DMG, open it, and drag ZsLink.app to Applications. If macOS blocks the first launch, allow it in System Settings under Privacy & Security.
-
02
Step 2: Set a fixed local port
Enter the local listen port and the dynamic discovery URL in ZsLink. Your iSCSI client, local browser, or Synology Drive Client connects to this local address.
-
03
Step 3: Start and keep it running
Click Start. When the remote mapped port changes, ZsLink checks and updates so local clients do not need repeated port edits.
Download
ZsLink for macOS
Works with macOS 13 and later. Download, drag ZsLink into Applications, and follow the macOS prompt on first launch.
Download for macOS
- File
- ZsLink-macOS.dmg
- Size
- 1.8 MB
- Updated
- 2026-08-20
- SHA-256
- ab218021674d29e417b996fb481eff8185a87155e855d314983329efca6f18ee
Contact
Trial feedback, licensing, or compatibility questions
Please include your macOS version, client type, and local port setup.