No Root Firewall

Just as its name suggests, NoRoot Firewall is a firewall that lets you block any app from accessing the Internet and doesn't require root privileges. Each time one of your apps tries to access the Internet, you'll receive a notification and can choose to allow the connection or deny it.

I would like to restrict such question to the core technical feature provided by such software (like the kind of firewalling: stateless or stateful, are there any hardcoded exceptions, the robustness of the code handling untrusted packets, etc.) and not on secondary features or anti-features they may have (ads, tracking, cosmetic, ...) unless they concretely affect the core objective of the software.

No Root Firewall

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A disadvantage of a firewall based on a local VPN is that not all traffic types can be handled, because the (Android) Linux kernel does not allow forwarding all traffic types over a socket based connection. An example is IPsec, which is being used for IP calling by some manufacturers. A partial (not for IPsec) solution to this would be to use a remote VPN server to forward traffic, but this is privacy wise not acceptable for a lot of people and would come with additional complexity and probably also with extra battery usage. In practice handling TCP and UDP traffic appears to be sufficient for 99,9% of the NetGuard users. Since Android 5 it is possible to exclude applications from being routed into the VPN (the VPN implementing application decides if this is mandatory or optional), which can be used to address problems arising from not being able to forward all traffic. Another option is to exclude address (ranges), which NetGuard uses to 'fix' IP calling for some manufacturers.

In general it has appeared that Android routes all traffic into the VPN, even traffic of system applications and components, but a manufacturer could decide to exclude certain traffic types, reducing the security that can be achieved by a VPN based firewall.

NetGuard does not analyze the data itself, except for DNS requests to provide ad blocking, but if it would it could raise a privacy concern. Nevertheless, technically seen this is an advantage of a VPN based firewall (if you still want to call it that way), because it would allow state-full inspection of data streams beyond what is possible with iptables. This would likely be at the costs of battery usage, because of the processing involved. Note that it would require a local MiT attack to inspect SSL streams.

Yet another disadvantage is that Android doesn't allow chaining of VPN's, so using a local VPN to implement a firewall will prevent using of a real VPN service, unless the firewall provides such a service itself or alternatively a forwarding or proxy mechanism to another VPN application.

Lastly, a VPN based firewall depends on the application providing the firewall VPN service to be running. This seems to be trivial, but it is not, because some manufacturer Android versions/variants are too aggressively killing processes in low memory conditions (IMHO it is a bug if Android kills applications providing a VPN service).

Finally, rooting of Android devices is becoming increasingly difficult, leaving a VPN based firewall as the only choice for many people. I don't expect Google to add a system based firewall anytime soon, because it could affect their ad revenue significantly. iOS does have a system based firewall.

Root based firewalls use IPFilter / iptables to control the flow. This automatically applies to all apps, whether there's a network connection available at all or not, whether the routing is working completely or not at all, or whether you're in a "closed environment" (Intranet) without access to the "outer world" (Internet). Apps you've got blocked are blocked. On a pretty low level.

Verdict: I'd personally trust a root-based solution more. But where rooting is not an option, non-root solutions should be almost as good. In that case, my recommendation would go towards open-source solutions like NetGuard (its developer also made Xprivacy and is well trusted). Speaking of which: For further details, take a look at the XDA introduction of NetGuard, which explains the background with some more details.

So I'm on OnePlus 6T Android 10, rooted with Magisk. I have AdAway to get rid of ads but I'm trying to find a firewall (paid or free) which blocks the selected apps internet connection when they're not in use. Example, If I select Uber, then Uber should/can ONLY connect to the internet when I launch the app, else it should be blocked.

Edit: So I tried AFWall+ but it doesn't seem to have what I'm looking for. Only app which had one is AdGuard which also doesn't seem to work really well, at least in root mode. Perhaps any developer who's seeing this might be interested and bring this vision into reality. Thank you all for taking the time and commenting!

NetGuard provides simple and advanced ways to block access to the internet - no root required.

Applications and addresses can individually be allowed or denied access to your Wi-Fi and/or mobile connection.

Blocking access to the internet can help:

Hi, after you load the factory-default config ( with the configuration command "load factory-default" you will have to set the system authentication password, otherwise the commit will fail and the config won't be activated. To set the password you can use the configuration command "set system root-authentication plain-text-password", and then type the pwd twice!

DataGuard No Root Firewall, Internet Data Blocker is a powerful tool that offers an Android-based firewall. By blocking access to the internet, you can prevent web attacks and protect yourself from unwanted access to the internet.

No root firewalls like this one here (aptly named) NoRoot Firewall is an application level firewall, which filters outgoing connections on a per app basis. It will by default block all outgoing connections by any app, and alert the user if a connection is made.

Android phones are powerful, but they can also be a little bit scary. One way to protect yourself is by installing one of these firewall apps on your phone. These are applications that can protect your phone from malicious internet content and even ransomware.

What makes AFWall+ stand out among other Android firewall apps is its compatibility with VPNs and Tor networks, which lets you tunnel traffic from apps through a VPN or the Tor network. This means that you can use AFWall+ to create an encrypted connection for specific apps so they cannot be monitored by your ISP or anyone else who might want to track your activity online.

The Linux Kernel can only be opened up to root by a Passcode Hash which you generate a key and give to TAC who will paste it into SSH session. It is proprietary to PAN which contains core system files. I would recommend installing Nagios on a seperate server.

Root level access to the operating system is reserved for TAC support interventions in case a software bug needs to be investigated further. The operating system is proprietary and designed to offer you the best possible performance for all firewall tasks, installing custom packages onto an appliance could compromise the performance of the appliance.

You better not modify the firewall configuration directly.

This may cause you to lose access to the router. And you had to use uboot to debrick your router.

I recommend you to write a startup script to change it.

Your changes about the firewall need to be based on the firewall configuration after the system initialized.

Therefore, you can copy the firewall configuration from the router to the Imagebuilder to make a default configuration.

Hello,

ive got a strange problem with the firewall rules, not sure if this is a bug or misconfiguration.

We have a bunch of clients that should not have internet access, but need to access the different network segments, i.e. greenblue.

So, weve got a group with the client MAC-adresses and a rule as follows:

Proto: ALL, SRC: said group, DST: RED -> Reject

The clients can not access webpages etc, but it does not work the intended way.

When trying to access an internal wiki-server it takes about 25 Seconds to load.

After some testing i found out that the wiki page redirects the client to download some fonts from fonts.googleapis.com.

As of my understanding the Firewallrule should reject that call, the client should detect that there is no way to get the font and display the page with the default font.

What happens in reality is that the firewall log says its forwarding the packets to the google servers and the clients just keep to try downloading the font for about 20something seconds and then displays the page with the default font.

For testing purposes i created the following rule analog to the existing one as the first one in the rules for only my test client:

You can use a firewall app to limit any Android app spying activity, for example, NoRoot Firewall is an excellent ad-free firewall app for Android OS! There are few others equally good, each offering some unique features, so better try them all and see which one is the best for your needs and workflow. ff782bc1db