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俺史上最強のiptablesをさらす
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QUESTION
I have an AWS ubuntu instance with the following network interfaces:
ens5
, ip: 172.XX.XX.XX
A5TAP
, ip:192.168.233.1 (VPN)
How do I udp port forward port 10000-10200 to 192.168.233.52:10000-10200? I tried a the obvious commands below for a single port 10009, but it is not working:
...ANSWER
Answered 2021-Jun-15 at 11:24I believe what you want is the following:
QUESTION
I have iplist.txt containing a list of ip I want to ban (one by line, extracted from a file.log and corresponding a certain condition like 3 or more access); I want to check for each ip of iplist.txt if it is already or not in iptables via its presence or not in file.dump (the iptables I've exported from iptables-save > file.dump):
...ANSWER
Answered 2021-Jun-13 at 08:42In the line:
QUESTION
I need some suggestions for best practicality, security and maintainability
The scenario is:
- We have a private VPC with some servers,
- We have users that can access server A and A only
- Some users can access A, and B.
- Other only B and so on.
They need to access to theses servers from home and office.
The current idea is having a multiuser OpenVPN server with IPTables blocking access to the servers that the user can't access
Is there another option using AWS tools (VPCs,Security Groups, ACLs, Load Balancers, or others)?
Or other solutions better than this one?
Draw of current arch:
- One boundary server that does the bridge from the open world to the Private VPC (With OpenVpn and IPTables)
- 5 servers inside the private VPC
- 10 Users with different levels of access
Thanks
...ANSWER
Answered 2021-Jun-08 at 05:19Use AWS IAM to manage user access and permissions.
For your scenario, you can create 3 groups: Server A, Server B, Server AB.
Then attach IAM policy to each group. The policies will restrict access to specific EC2 only.
Sample Policy that may work for you (via https://aws.amazon.com/premiumsupport/knowledge-center/restrict-ec2-iam/ )
QUESTION
I'm facing a huge slow while managing a specific remote host with a specific role.
I have tracked down the source of the slowness and found that for a very specific variable (defined for that specific host and used by that specific role), ansible
and ansible-playbook
takes up to 30 seconds to build it while for other variables it takes few seconds only.
I have activated verbose mode and checked log file but nothing unusual except that ansible
is completely silent (no logs are added) for a very long time for the problematic variable.
My questions:
- is there a way to debug
ansible
to get the root cause of the issue I'm facing? - anybody can suggest an explanation of this behavior?
Here is the outcome of printing the problematic variable iptables
and another normal variable ifcfg
:
ANSWER
Answered 2021-Jun-05 at 10:54With the help of @Zeitounator
, I have solved the issue.
The iptables
variable is a dictionary with several levels and I have two more variables nets
and ifcfg
that are also dictionaries with several levels.
Many values of iptables
are set with values from ifcfg
that are set using values from nets
.
I have managed to set values in iptables
using values from nets
directly and now the evaluation of iptables
is as fast as the other variables.
QUESTION
I am trying to achieve the network architecture above. The Pi is connected to the drone via WiFi, and it is connected to the Access Point via ethernet.
How can I route packets via the Raspberry Pi to a Tello drone, and from a Tello drone via the Raspberry Pi to 192.168.1.100? What iptables commands could I use?
This is the simple python script I am using to send the drone commands from 192.168.1.100.
...ANSWER
Answered 2021-Jun-02 at 17:15Sry for late reply, just back from some testing.
You may follow this thread here for some answer
https://stackoverflow.com/a/67664774/11530294
the key command to achieve the forwarding is sudo iptabels
You may refer to this technical report for details. https://github.com/snakehaihai/Tello_formation_and_visual_control/blob/master/Technical%20Report.pdf . The key command and instructions are all in the appendix section
The rest of github repo construction isn`t complete yet. but the key command is already provided in technical report. For visual SLAM based navigation, the core source code is here but need tons of tuning.
QUESTION
I want to create a firewall to Docker container that allows only some IPs and rejects others.
The default setting was like this:
...ANSWER
Answered 2021-Jun-01 at 11:35Specify the -i
option as documented.
QUESTION
I run a working Wireguard server with 2 Wireguard Gateways for Site-to-Site VPN and a couple of Mobile Devices with a Full Tunnel that are used occasionally. One of my Site Gateways is a RaspberryPi4 that I want to provide a WIFI-Access-Point that directly tunnels to the Wireguard Server. This RaspberryPi has working access to all connected subnets via the main Server, so Wireguard is setup properly.
I want to use my Raspi4 to roam the world and provide me a WIFI-Access-Point while any device that connects to it is directly routed into Wireguard and emerges to the web only from there. I used the standard gateway setup provided and my WIFI device can access the web but doesn't tunnel through Wireguard (yet).
I can't really find where I can configure where the access point is bound to, dnsmasq, apdconf or a simply iptables rule?
Example IPs
Server: 10.0.7.1, local network 192.168.0.1/24
Raspi4: 10.0.7.5, local network 192.168.6.5/24, WIFI 192.168.7.5/24
So far I haven't succeeded, ideas?
...ANSWER
Answered 2021-May-31 at 14:56Got it to work, took a few steps.
First I changed the Wireguard-tunnel on the RP4 to be a full tunnel, it was previously a split-tunnel, only routing the IPs of the other local LANs into the wg0 interface.
Working Full Tunnel:
QUESTION
I'm trying to deploy the ELK stack to my developing kubernetes cluster. It seems that I do everything as described in the tutorials, however, the pods keep failing with Java errors (see below). I will describe the whole process from installing the cluster until the error happens.
Step 1: Installing the cluster
...ANSWER
Answered 2021-May-26 at 05:06For the ELK stack to work you need all three PersistentVolumeClaim's to be bound as I recall. Instead of creating 1 30 GB of PV create 3 of the same size with the claims and then re-install. Other nodes have unmet dependincies.
Also please do not handle the volumes by hand. There are guidelines to deploy dynamic volums. Use OpenEBS for example. That way you wont need to worry about the pvc's. After giving the pv's if anything happens write again with your cluster installation process.
I was wrong obviously, in this particular problem, filesystems and cgroups take role and the main problem of this is an old problem. From 5.2.1 to 8.0.0. Reinstall the chart by pulling the chart. Edit values file and definitely change the container version. It should be fine or create another error log stack.
QUESTION
I can configure apiserver.service-node-port-range
extra-config with a port range like 10000-19000
but when I specify a comma separated list of ports like 17080,13306
minkube wouldn't start it will bootloop with below error
ANSWER
Answered 2021-May-28 at 07:21Posting this as community wiki, please feel free and provide more details and findings about this topic.
The only one place where we can find information about comma separated list of ports and port ranges is minikube documentation:
Increasing the NodePort rangeBy default, minikube only exposes ports 30000-32767. If this does not work for >you, you can adjust the range by using:
minikube start --extra-config=apiserver.service-node-port-range=1-65535
This flag also accepts a comma separated list of ports and port ranges.
On the other hand from the k8s documentation:
--service-node-port-range Default: 30000-32767
I have tested this with k8s v 1.20 and comma separated list of ports also doesn't work for me. Kube-apiserver accept two approaches:
set parses a string of the form "value", "min-max", or "min+offset", inclusive at both ends
QUESTION
I am learning routing with tuntap interfaces... and I had created a tun0 interface and configured Ip address with ifconfig command on different subnet and adding the gateway with ip route command and I have also used masquerading rule ... my doubt is can i ping with tuntap interface or they are only used to route the traffic or something I don't know about these interface or may be misconfiguration..
May be this question sounds me new bie and I am but give please give me correct direction..
Ok Gerhardh,
Edit: I had created tun dev like this:
...ANSWER
Answered 2021-May-27 at 10:32Standard network interfaces have a piece of hardware behind them (a network card).
Tuntap don't:
https://www.kernel.org/doc/Documentation/networking/tuntap.txt
tl;dr: packets sent to a tuntap interface are handed over to a user-space program for processing. This program takes on the role of the network card in some way (example: openvpn). Unless there is a program taking packets out of the device and doing something meaningful with them, they will vanish into the void (like a network card with a disconnected cable).
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