Use full tunnel VPN for strict control, split tunnel VPN for speed, and ZTNA when you want safer access without dragging every user into the same private network. That is the clean answer. Full tunnel is the “send everything through HQ” option. Split tunnel is the “only send work apps through VPN” option. ZTNA is the “prove who you are, then get only the app you need” option.
TLDR: Full tunnel VPN sends all user traffic through the company VPN, while split tunnel VPN sends only selected traffic through it. For example, a remote designer may send payroll and file server traffic through the VPN, but stream a training video directly from the internet. In many teams, split tunneling can cut VPN bandwidth by 40% to 70%, which means fewer slow calls and fewer angry tickets. ZTNA can go even further by giving users access to one app at a time, not the whole network.
Full tunnel VPN: the “everyone through the front door” model
A full tunnel VPN routes all traffic through the VPN. Work apps. Web browsing. DNS requests. Cloud tools. Even that tab playing lo-fi music while someone edits a spreadsheet.
This gives the IT team one big control point. Security tools can inspect traffic. Company policies can apply to everything. Logs are easier to collect. It feels neat.
But neat can be slow.
If a user in Berlin visits a cloud app hosted nearby, full tunnel may still send that traffic through a VPN gateway in New York. Then it comes back across the internet. That is a silly little world tour for a login page.
Honestly, it feels like making every employee walk through the office lobby just to open the fridge at home.
Full tunnel works best when:
- You need tight control over all traffic.
- Users work with sensitive data.
- Compliance rules are strict.
- Public Wi Fi use is common.
- You want all browsing filtered by company tools.
It is common in banks, hospitals, law firms, and government teams. The tradeoff is speed. Video calls may stutter. SaaS apps may feel sticky. Downloads can crawl.
Split tunnel VPN: the “only work traffic goes through” model
A split tunnel VPN is more selective. It sends company traffic through the VPN. Other traffic goes straight to the internet.
So, the finance app goes through the VPN. The company file share goes through the VPN. But YouTube, Spotify, and a public news site do not.
This can make users much happier. It can also save money. Less traffic hits the VPN gateway. Less bandwidth is needed. Cloud apps often load faster.
Split tunnel is useful when:
- Your team uses many cloud apps.
- VPN speed is a common complaint.
- Remote workers are spread across countries.
- You want to reduce load on VPN hardware.
- You trust endpoint security on user devices.
But there is a risk. Internet traffic may skip company inspection. A user could visit a sketchy site while connected to the VPN, and that traffic may not pass through your secure gateway.
That does not make split tunnel “bad.” It means you need guardrails. Use endpoint protection. Use DNS filtering. Patch devices. Require MFA. Keep routing rules clean.
And please test the rules. Nothing ruins a Tuesday like hearing “the CRM works, but only if I turn the VPN off.” Expect to waste time on weird routing bugs if the setup is rushed.
Full tunnel vs split tunnel: simple example
Picture Maya. She works from home. She needs three things:
- A private company file server.
- A cloud project tool.
- A video call with the team.
With full tunnel, all three go through the VPN. The file server is protected. The project tool is filtered. The video call also goes through the VPN, even if it does not need to. If the VPN gateway is busy, the call may freeze.
With split tunnel, the file server goes through the VPN. The cloud project tool may go direct, if allowed. The video call goes direct too. Maya gets better call quality. IT gets less traffic.
Now add risk. If Maya’s laptop has malware, split tunneling could let some traffic avoid central controls. Full tunnel gives IT more visibility. That is the trade.
Quick comparison
| Feature | Full Tunnel VPN | Split Tunnel VPN |
|---|---|---|
| Traffic routing | All traffic through VPN | Only selected traffic through VPN |
| Speed | Often slower | Often faster |
| Security control | More central control | More depends on device controls |
| Bandwidth cost | Higher | Lower |
| User experience | Can feel heavy | Usually smoother |
So where does ZTNA fit?
ZTNA means Zero Trust Network Access. The name sounds dramatic. The idea is simple.
Do not trust a user just because they connected to a VPN. Check the user. Check the device. Check the app request. Then allow only what is needed.
Traditional VPN often gives access to a network segment. ZTNA gives access to a specific app. That is a huge difference.
With a VPN, a user may enter the “building.” With ZTNA, the user gets a key to one room. Maybe just one drawer. Very picky. Very useful.
ZTNA can help when:
- Users need access to private apps, not full networks.
- Contractors need limited access.
- You have many cloud and hybrid apps.
- You want stronger identity checks.
- You want to reduce lateral movement after a breach.
That last point matters. If an attacker steals VPN access, they may scan the network. They may find more targets. ZTNA cuts that down. The attacker sees only what the policy allows. Ideally, that is almost nothing.
Is ZTNA better than VPN?
Sometimes, yes. But not always.
ZTNA is great for private web apps, admin portals, internal tools, and contractor access. It is less magical for old systems that expect network level access. Some legacy apps are stubborn. They were built in a time when “remote work” meant checking email at a hotel business center.
A lot of companies end up with a mix:
- Full tunnel VPN for high risk users or strict compliance.
- Split tunnel VPN for general remote work.
- ZTNA for app specific access.
This is normal. Security is rarely one tool. It is a set of choices. Some are elegant. Some are duct tape with a budget code.
How to choose without getting a headache
Use these simple rules.
- Pick full tunnel if control matters more than speed.
- Pick split tunnel if speed matters and endpoints are well protected.
- Pick ZTNA if users only need certain apps.
- Use MFA no matter what you choose.
- Log access so you can spot strange behavior.
- Review policies every few months.
Here is a plain test. Ask, “Does this user need the network, or just one app?” If the answer is one app, ZTNA is probably a better fit. If the user needs broad internal access, VPN may still be needed.
Common mistakes
Mistake one: using full tunnel for everyone. This can overload gateways and annoy users.
Mistake two: using split tunnel with weak device security. Fast is nice. Fast and unsafe is not.
Mistake three: treating VPN login as full trust. A password and a tunnel do not make a device clean.
Mistake four: ignoring user pain. If a call takes 8 seconds longer to connect every single time, people will complain. Then they will find workarounds. Workarounds are where security plans go to cry.
Final recommendation
Start with the risk. Then pick the tunnel.
If your company handles sensitive records, full tunnel may be worth the slower feel. If your team lives in cloud tools, split tunnel can be the saner choice. If people need access to a few private apps, ZTNA is often cleaner and safer.
The best setup is usually not “VPN or ZTNA.” It is “use the least access needed.” Give users what they need. Block what they do not. Keep it simple. Your users will be happier. Your security team will sleep better.
