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[GH-ISSUE #1642] [Question] Does 'netfilter=filename' affect the system firewall, eg UFW #1107

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opened 2026-05-05 07:27:42 -06:00 by gitea-mirror · 3 comments

gitea-mirror commented

2026-05-05 07:27:42 -06:00

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Originally created by @Irvinehimself on GitHub (Nov 12, 2017).
Original GitHub issue: https://github.com/netblue30/firejail/issues/1642

As the title states: Does playing around with Firejail netfilters on a per application basis represent a safe way of learning about netfilter rules?

At the moment, I use the default UFW rules

 Default: deny (incoming), allow (outgoing), disabled (routed)

and am loathe to experiment with these settings until I have a better understanding of what I am doing

Thanks
Irvine

Ps, If if you are interested, I have attached zipped profiles for: bsdtar, cower, makepkg, ping and archaudit-report
Profiles.zip

Originally created by @Irvinehimself on GitHub (Nov 12, 2017). Original GitHub issue: https://github.com/netblue30/firejail/issues/1642 As the title states: Does playing around with Firejail netfilters on a per application basis represent a safe way of learning about netfilter rules? At the moment, I use the default UFW rules ``` Default: deny (incoming), allow (outgoing), disabled (routed) ``` and am loathe to experiment with these settings until I have a better understanding of what I am doing Thanks Irvine Ps, If if you are interested, I have attached zipped profiles for: bsdtar, cower, makepkg, ping and archaudit-report [Profiles.zip](https://github.com/netblue30/firejail/files/1464407/Profiles.zip)

gitea-mirror

2026-05-05 07:27:42 -06:00

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gitea-mirror commented

2026-05-05 07:27:45 -06:00

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@SkewedZeppelin commented on GitHub (Nov 12, 2017):

I don't think Firejail ever directly interacts with UFW. And afaik UFW is just a fancy bash script to control iptables.

As for learning about iptables here are some nice writeups:

@SkewedZeppelin commented on GitHub (Nov 12, 2017): I don't think Firejail ever directly interacts with UFW. And afaik UFW is just a fancy bash script to control iptables. As for learning about iptables here are some nice writeups: - https://www.digitalocean.com/community/tutorials/how-to-choose-an-effective-firewall-policy-to-secure-your-servers - https://www.digitalocean.com/community/tutorials/a-deep-dive-into-iptables-and-netfilter-architecture - https://security.stackexchange.com/questions/4603/tips-for-a-secure-iptables-config-to-defend-from-attacks-client-side/4745#4745 - https://people.netfilter.org/hawk/presentations/devconf2014/iptables-ddos-mitigation_JesperBrouer.pdf (outdated! linux 4.4 features a lockless TCP listener)

gitea-mirror commented

2026-05-05 07:27:47 -06:00

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@netblue30 commented on GitHub (Nov 15, 2017):

Does 'netfilter=filename' affect the system firewall, eg UFW

No, Firejail doesn't touch your system firewall. It installs a new one in the sandbox if you use --net to start another network namespace. Each network namespace (system or sandbox) has its own firewall.

I'll start bringing in your profiles, thanks.

@netblue30 commented on GitHub (Nov 15, 2017): > Does 'netfilter=filename' affect the system firewall, eg UFW No, Firejail doesn't touch your system firewall. It installs a new one in the sandbox if you use --net to start another network namespace. Each network namespace (system or sandbox) has its own firewall. I'll start bringing in your profiles, thanks.

gitea-mirror commented

2026-05-05 07:27:48 -06:00

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@netblue30 commented on GitHub (Nov 18, 2017):

all merged, thanks.

@netblue30 commented on GitHub (Nov 18, 2017): all merged, thanks.

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Reference: github-starred/firejail#1107

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