Questions tagged [firewall]
A firewall is a program that controls the incoming and outgoing network traffic on a system. Use this tag for all questions related to firewall configuration and operation.
1,069 questions
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I'm confused. Is my UFW firewall working or not?
Linux Endeavouros.
I don't understand how to tell if my firewall is on or not.
Using systemctl status ufw gives:
ufw.service - CLI Netfilter Manager
Loaded: loaded (/usr/lib/systemd/system/ufw....
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How to idiomatically secure a Fedora Workstation system against all incoming connections?
Dear ServerFault community!
I run Fedora Workstation (currently version 42) on my laptop, and would like to configure my firewall to just reject or drop all incoming connections to keep my system ...
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Problem using "dynamic" maps with nftables
I want to create an nftables filter rule that drops traffic where the source and destination address are equal. Nftables only allows to compare addresses against constants or sets/maps. So I tried to ...
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iptables changes not having any effect [closed]
I was attempting to interrupt a TCP connection on my system, and was altering iptables rules using the iptables command.
Nothing I did seemed to have any effect, though. Inserting and deleting rules ...
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How to enable the listing of Chromecast devices in the full network (mDNS): Chromecast devices are not showing in VLC or Chromium
Chromecast is working well in my home (trough multiple switches connecting different rooms) but I am unable to cast from my openSUSE Linux device. The Chromecast devices are not showing up neither in ...
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Does Linux have a generic way to dynamically open ports? (Desktop)
By generic, I mean, mostly standard, i.e. not dependent on ufw or firewalld. What I am asking is if there is something akin to what you have on Windows, where if some game wishes to "Open to Lan&...
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Iptables does not apply drop policy for other ports
I'm running a server where iptables is configured with a default DROP policy and I’ve only explicitly allowed certain ports (e.g., HTTP, HTTPS, SSH on port 22, etc.). Despite never adding a rule for ...
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libvirt kvm virtual routed network: cannot ping gateway itself or beyond
I'm having trouble with libvirt kvm's routed networks where a VM inside a routed virtual network can ping every VM in my home subnet except the default gateway... or any gateway for that matter.
I ...
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Unable to change firewall active zone
I am trying to update my firewall but now i want to revert it back to public
so basically the firewall is running and it was
public (active)
target: default
icmp-block-inversion: no
interfaces: ...
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NFTables tables, hooks and rules ordering
I'm new to nftables but have used iptables for quite a while now. While playing with nftables, I was thinking: "Hey, this is cool, I could have like a management table, where all the mngt stuff ...
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IPFW documentation
I am setting up router inside freebsd jail with ipfw, I might be blind, but I could not find comprehensive documentation on IPFW, which would make subject clear.
I read both "firewall" and &...
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HTTP/HTTPS Packets Getting Dropped [nftables]
I am using the ebtables broute table to selectively "deny up" HTTP/HTTPS packets - I want to process them at the IP (L3) layer with nftables.
I am having this problem where the packets are ...
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Firewall in Bridged LXC Containers
I am new to networking, and I am trying to implement a firewall inside an LXC container (Alpine Linux) that is bridged with another LXC container (Alpine Linux) through a br0 interface.
Right now, my ...
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NFtables unique handle
is nftables use unique handle ?
I mean it's possible to have a handle id used on both table and rule or chain ?
if handle is unique . What is unique strategy ?
For example :
Unique on whole nftables ...
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Ask for validation of nftables rule for throttling SCTP/DIAMETER AIRs
I'm trying to build an nftables rule which can throttle SCTP traffic which contains DIAMETER. I would further like to only drop Authentication Information Requests (AIR).
So in general everything ...
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