3 VPN settings to check before your next trip
VPNs May Leave Travelers Vulnerable During Network Swaps, Experts Warn
Travelers who rely on virtual private networks (VPNs) to keep their data secure may experience a brief period of unencrypted traffic each time their device switches from one Wi‑Fi network to another or from cellular data to a public hotspot. Security researchers say that the short gap, often lasting only a few seconds, can expose a user’s IP address and other details that the VPN is meant to hide.
The risk arises when a phone, tablet, or laptop disconnects from one network and reconnects to another while the VPN is still trying to re‑establish its secure tunnel. If the device regains internet access before the VPN can reconnect, the traffic that passes through the new network is not encrypted by the VPN. Though most modern websites use HTTPS and therefore remain encrypted, the exposure of the public IP address can still provide clues about the user’s approximate location and the network’s operator.
Security experts recommend a few settings to keep a VPN running smoothly during travel:
Enable auto‑connect. Most VPN apps can automatically reconnect whenever a device regains internet connectivity. Turning this feature on means the VPN will try to restore its tunnel as soon as the device re‑joins a network, reducing the chance that any traffic slips through unprotected.
Use a kill switch. A kill switch blocks all internet traffic if the VPN disconnects unexpectedly. Some kill‑switches are configured to allow traffic only when the VPN is active; others activate only on sudden drops. The former can interfere with local network functions, so users should understand how their chosen VPN’s switch works.
Choose a protocol that handles network changes well. VPN protocols differ in how quickly they can re‑establish a connection when a device moves between cellular data and Wi‑Fi. Some protocols are more resilient for mobile devices that frequently switch networks.
The problem is most noticeable in airports, hotels, and coffee shops where Wi‑Fi networks often require a captive‑portal login page. While a device is waiting for the user to accept terms or enter a room number, the VPN cannot yet connect. If a kill switch is set to block all traffic outside the VPN, the device may be unable to reach the login page until the user disables the switch or completes the portal authentication.
Experts advise that travelers first test their VPN setup before heading out. A simple test involves connecting to the VPN, turning off Wi‑Fi to force the device to cellular, then switching Wi‑Fi back on and watching whether the VPN reconnects automatically and whether any traffic is blocked during the transition.
While HTTPS protects the content of most web traffic, a VPN adds an extra layer of privacy by masking the user’s real IP address from the websites they visit and from the operators of the public networks they use. “When your VPN is disconnected, websites and online services can generally see the public IP address assigned by your internet provider or Wi‑Fi network instead of the VPN server’s IP address,” said a security analyst.
The same principle applies to any device that frequently changes networks, including laptops that may move from a flight’s Wi‑Fi to a hotel’s network. “The biggest issue for travelers is making sure the VPN actually reconnects when a phone or laptop moves between cellular service, airport Wi‑Fi, hotel Wi‑Fi and other networks,” the analyst added.
In addition to these practical tips, a cybersecurity blogger named Kurt “CyberGuy” Knutsson is offering a free online class on September 26 at 11 a.m. Eastern Time. The session will cover using artificial intelligence to manage health records, appointments, and prescription research, and it will be available at CyberGuyLive.com.
Travelers are encouraged to review their VPN’s settings and confirm that auto‑connect and kill‑switch features are configured correctly before embarking on a trip. A few minutes of preparation can help keep a VPN’s protection continuous, even as devices hop between different wireless networks.