this post was submitted on 24 Jul 2024
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I only had to run this in my home server, behind my router which already has firewall to prevent outside traffic, so at least I'm a bit at ease for that.
In the VPS everything worked without having to manually modify iptables.
For some reason I wasn't being able to make a curl call to the internet inside docker.
I thought it could be DNS, but that was working properly trying
nslookup tailscale.com
The call to the same url wasn't working at all. I don't remember the exact details of the errors since the iptables modification fixed it.
AFAIK the only difference between the two setups was ufw enabled in the VPS, but not at home.
So I installed UFW at home and removed the rule from iptables and everything keeps working right now.
I didn't save the output of iptables before uwf, but right now there are almost 100 rules for it.
Oh, that's a good point!
I'll later try to replicate the issue and test this, since I don't understand why
OUTPUT
should be solved by anINPUT
rule.