topic Re: Split-tunnel not working properly in General Topics

Split-tunnel not working properly

FarkhanAliyev — Thu, 01 Jun 2023 09:02:50 GMT

Hi folks,

Our customer configured split-tunnel on VM to include only certain IP addresses and domains and want to exclude any other traffic, so exclude options are blank. It seems that some traffic is still routed through tunnel (f.e.Telegram, bittorrent etc.)

We tested this config on panos 10.1.6 as well as on 10.1.10. Also we were testing it on different GP versions, but the result was the same. We sniffed traffic and can see that it is going through tunnel.

I can see in pangps that access routes are successfully pushed to the agent and route print shows those routes.

It works only if we deny unnecessary traffic in security policy but its not quite what we expect.

Did someone face the same issue?

Re: Split-tunnel not working properly

OtakarKlier — Thu, 01 Jun 2023 17:00:13 GMT

Hello,

Make sure the policy is setup correctly for domains and applications. Also make sure the customer is not subject to any compliance regulations as most, if not all, do not allow for split tunneling.

https://docs.paloaltonetworks.com/globalprotect/10-1/globalprotect-admin/globalprotect-gateways/split-tunnel-traffic-on-globalprotect-gateways/configure-a-split-tunnel-based-on-the-domain-and-application

Regards,

Re: Split-tunnel not working properly

FarkhanAliyev — Fri, 02 Jun 2023 09:55:41 GMT

By compliance regulations you mean that it could be controlled from ISP or governance side?

Re: Split-tunnel not working properly

OtakarKlier — Fri, 02 Jun 2023 15:42:16 GMT

Hello,

Sorry for not clarifying, when I refer to regulations, yes it could be local/government laws. But it could also mean complying to regulations such as PCI, GRC, FISMA, etc.

Regards,

Re: Split-tunnel not working properly

FarkhanAliyev — Wed, 14 Jun 2023 12:52:48 GMT

Hey,

I was testing everything. Here are some new findings.

- Behavior is the same on two different firewalls in different countries so we don't think that regulatory compliance is the problem.

- This problem doesn't relate to Mac endpoints, only windows is affected. I saw an article when DELL optimizer can interfere split tunnel, but there is no such app on affected endpoints.

Any thoughts about that?