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So my only option would be whitelisting certain input ports for output? Is that possible? I'm thinking allow request on INPUT to x.x.x.x:8080 go OUTPUT. ie: --append OUTPUT --jump ALLOW --destination x.x.x.x ...

johnramsden
– johnramsden

2020-03-17 23:54:32 +00:00
Commented Mar 17, 2020 at 23:54
I didn't check the syntax, but this is correct. Just as i told, your requirement can't be met. If there is some possibility to run a script on incoming packets, you could change the rules. But last time i've been working on firewall rules, this wasn't possible.

WGRM
– WGRM

2020-03-18 01:30:31 +00:00
Commented Mar 18, 2020 at 1:30
This is correct. Based on your example you intend to allow incoming connections from some IP. However, they can't be RELATD/ESTABLISHED as you've prohibited starting connections from this server. Therefore, your state should be set to 'NEW'.

LJKims
– LJKims

2020-03-18 16:37:52 +00:00
Commented Mar 18, 2020 at 16:37
But this wouldnt block anything, would it. There was a misunderstanding, how it works.

WGRM
– WGRM

2020-03-18 16:39:54 +00:00
Commented Mar 18, 2020 at 16:39

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