a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts

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Notification whenever a program connect to internet/outside

I always use public WiFi in my college. Hence I thought of setting up a firewall. It was not as easy as I thought. My current set up is that all incoming connections are blocked except ssh. Is there a ...
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1answer
19 views

Forwarding all Internet Traffic over VPN (PPTP UFW)

I've set up a VPN using the guide here but what I cannot seem to get working is forwarding all my internet traffic over the VPN. I can connect and view the other machines on my network. I am using ...
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16 views

Webmin Linux Firewall NAT and Packet Filtering

Can someone explain to me the difference between these two? Like in NAT and Packet Filtering there are rules for both incoming and outgoing packets. I do not really understand their differences. What ...
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28 views

Route packets between 3 subnets (nics) on same server

I have 3 subnets on my one server which acts as the router/gateway (10.1.10.0, 172.16.1.0, 172.16.2.0). All three subnets are assigned to their own NICs on the server. eth0 (10.x.x.x) is my ...
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21 views

Iptable rules filtering from ip address to interface

By default I have an implicit deny on my ubuntu firewall but I want to make the ip address 10.1.10.201 have a few privileges. I want it to have ssh and telnet capabilities to contact the external ...
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14 views

Openssh no port truly open

On Ubuntu 14.04lts, i try to install openssh-server (and client by the way) An apt-get install openssh-server openssh-client later I do not have change the sshd_config yet. The server is well ...
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20 views

regenerate iptables from “iptables -L”after disk failure

My system disk failed catastrophically. I've replaced and mostly restored the OS on a new disk but all I have for my iptables is the output from iptables -L. Is there a way to automatically recreate ...
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1answer
32 views

Firewall rules not working for network

I have configured my ubuntu server to be a router and firewall. It has dhcp functionalities and it gives ip addresses to my other two computers. There is an implicit deny in the network. However the ...
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0answers
24 views

Ubuntu server as dhcp router/firewall

I have properly configured the ubuntu server to have dhcp service and firewall rules. I also placed some firewall rules for testing. I just do not really know how to test it on lets say another ...
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2answers
41 views

How to open ports?

I recently installed a firewall called "firewall-applet" and now I can't share my internet through ethernet cord I tried all of these with no success sudo apt-get --purge remove firewall-applet ...
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11 views

Ubuntu UFW extending to whole network

UFW only allows the firewall to work within where it is installed. I was wondering if I made my ubuntu a wireless access point and other computer start connecting to it will UFW work for the other ...
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1answer
26 views

What's the scope of `ufw` and its implicit Deny rule with regards to my network?

Is the implicit deny of UFW only for when people are connecting to its IP address or for the whole network? I have tried telnet to the IP address and yes it gets denied but when I tried to telnet to ...
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1answer
21 views

UFW Firewall rule not working

I have an ubuntu vm which runs the UFW and a microsoft xp professional. The ip address of the ubuntu is 192.168.254.132 and so I made the xp have a static ip address of 192.168.254.131 so they will be ...
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0answers
6 views

UFW keep close after running les than 24 hrs

I have tried to start the ufw ufw enable It it started. But it will stopped again in less than 24 hrs. How to make it keep running?
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1answer
44 views

iptable rules works sometimes only

I have blocked an attacker IP that was sending me lots of UDP packets. iptables -I INPUT 1 -s IP_OF_ATTACKER -j DROP This rule was working all fine. iptables -nvL --line-numbers 22G traffic was ...
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1answer
20 views

How to tell if I have a firewall installed on my VM

I inherited a college VM I am trying to setup to accept remote connections to its MySQL DB from my local phpMyAdmin I am going through some SO Questions and tutorials (this/this) on setting this up ...
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1answer
20 views

Stateful Packet Inspection on Ubuntu?

By default Ubuntu doesn't have open ports (exceptions: Avahi and dhcp). Assuming that my system is connected to the internet by direct way (no hardware firewall used): If I am sending a UDP packet to ...
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1answer
33 views

Why ntpd needs an open port?

On my Ubuntu system I have activated the 'Time Synchronization via Internet'. Because of that the ntp daemon gets started. What I don't understand: Why needs ntpd an open UDP port 123? Actually, I ...
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1answer
46 views

iptables allow just internet connection

let me explain what I did before; # Only INPUT policy DROP, others are ACCEPT sudo iptables -P INPUT DROP sudo iptables -A INPUT -p tcp --sport 80 -j ACCEPT I also try this; for these ports to 443 ...
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1answer
42 views

Ubuntu Server 14.04 Drop UDP packet

I use Ubuntu server as part of my system and now I have seen something interesting. I have a router that sends me ethernet 802.11 packets. I generate this packet in the router and then send it under ...
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0answers
26 views

cloud linux firewall port scan blocking my ubuntu desktop

My hosting provider's cloudlinux server is blocking my Ubuntu desktop every time I try to access the webserver. How do I find out what is causing this issue? Log shared with me.. May 28 13:49:32 ...
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1answer
110 views

UFW & VPN : How to allow reconnection

Here are the rules of my firewall : deny outgoing deny incoming allow out from any to any on tun0 (alow just the traffic from the VPN) However, I am forced to disable ufw when I want to start my ...
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0answers
23 views

UFW blocking 169.254.0.0 (link-local / apipa) addresses?

When using iftop on my wlan0 interface, there are a few link-local addresses connecting. How and where can I filter these connections? I have very specific UFW rules blocking 169.254.0.0/16, but I ...
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2answers
47 views

How to allow this connection on the Firewall?

I am trying to connect my Ubuntu Web Server to my Ubuntu Storage Server using NFS (Network File System). But when I try to mount a Storage Server to the Web Server, I get a "Connection Timeout" ...
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35 views

14.04 How to unblock UDP ports and UDP packets?

I'm use and Ubuntu Server, and I use it an Asterisk 11. But I have to unblocking the UDP Port 5089 and port for UDP packets in the range of 16384-16482. Also, I need to disable "SPI" in my firewall. ...
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1answer
33 views

How can i make both iptables/ip6tables run at startup?

I have two differents set of rules in two files, one is dedicated to ipv4 and the other for ipv6. To make them persistant I use the if-pre-up/if-post-down script : #! /bin/sh iptables-restore < ...
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76 views

Ubuntu Port Scan , Security concerns

Scan results of my ubuntu 14.04 $ nmap 127.0.0.1 Starting Nmap 6.40 ( http://nmap.org ) at 2015-05-02 08:43 IST Nmap scan report for localhost (127.0.0.1) Host is up (0.0021s latency). Not shown: ...
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1answer
58 views

ufw port accessible locally but not remotely

I am trying to access an application on my server I have running on port 8000. From the server I can access the application via curl mydomainname.com:8000 from any other machine I just get curl: (7) ...
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1answer
41 views

Do iptables support jitter simulation?

I'm using 14.04.1-Ubuntu. I'm trying to find out if iptables supports creating jitter, like it does for packet loss. I'm using iptables -A INPUT -m statistic --mode random --probability 0.02 -j ...
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68 views

configure rsyslogd to capture events from router device

I have DLink DIR 615 router, which is able to send syslog messages. I have enabled this type of sending on the router and set my Ubuntu server's IP as destination. On the server I made appropriate ...
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2answers
30 views

Firewall Ports for Filesharing With OSX

I tried searching for this but I'm coming up short. Maybe my wording is wrong. I have my Ubuntu machine showing on my LAN - and I can see it from the Finder Window in OSX - but it won't connect when ...
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0answers
42 views

Gufw log: rejected, denied and allowed connections

I have got Gufw installed, and I have set some firewall rules so that it rejects and allows certain IP addresses. And although I have set it so that it logs-all, I cannot seem to find anywhere where ...
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1answer
34 views

Ubuntu 12 ufw not allowing connections even if it says Anywhere?

Currently I can't seem to connect to my Ubuntu 12.04 server unless I disable my ufw or if I do a "ufw allow ip_address". When I do a "ufw status" I get the following: I deleted the allow my ...
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0answers
74 views

unable to start (Ubuntu server 14.04) iptables service it show “Unrecognized service”

Ubuntu server 14.04 iptables service start shows: Unrecognized service
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0answers
33 views

Web service only responding to local request

I have a webservice that listen on port 5678 on a remote ubuntu machine. netstats: tcp 0 0 0.0.0.0:5678 0.0.0.0:* LISTEN 10605/node I don't have any ...
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1answer
70 views

Do I need to install a firewall, or is there already one active pre-installed? [duplicate]

When I first touched linux, I installed Zorin. It's essentially an Ubuntu fork, but the desktop is redesigned to make it look like home to a person who has been using Windows for a long time. It came ...
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0answers
98 views

Why can't I connect to my localhost port from a remote computer?

I'm using link-grammar server to convert sentences into semantic graphs. It provides an API though a port to do the above process. It's configured to works through port 9000 of localhost. I used to ...
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0answers
47 views

Problem running ufw on Ubuntu 14.04 server

ufw is supposed to be the easy firewall for Ubuntu, but I seem to still having missed something. After a fresh install on my 14.04 server, and leaving it default, the terminal will freeze after ...
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0answers
29 views

UFW open range is still blocked

I have opened up a range of ports using UFW. The rules in question are shown below (output of sudo ufw status numbered). I have restarted UFW since I added the rule, yet in lnav I still see log ...
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0answers
109 views

ufw on ubuntu doesn't work, how to deactivate plesk firewall?

Since I'm a totally newbie to server stuff but I needed to set up a vServer, I let install Ubuntu 14.04 AND Parallels Plesk on it. Now, I think it would have been better to install Ubuntu without ...
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1answer
95 views

No UFW logs at syslog

I'm using here the UFW as a basic protection. When I'm using the wi-fi from the college I get some UFW block (which is normal, because the firewall is ON). But strangely, I'm not getting any UFW logs ...
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0answers
52 views

GUI Firewall status display

I'm looking for a panel item or screenlet or something to display the status of my firewall. /usr/bin/firewall-applet appears to be the right thing and it is already in "Startup Applications" ...but I ...
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0answers
128 views

iptables: write UDPv4: Operation not permitted (code=1)

I am trying to set up a stateful firewall using iptables. It is for use on my desktop machine. Below are the contents of my firewall script: #!/bin/bash iptables-save > ...
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1answer
129 views

Configure UFW to allow only established and related conections (on IPv4)

I want to configure ufw to deny everything except the related and established connections. On iptables I usually did : -P INPUT DROP -P FORWARD DROP -P OUTPUT ACCEPT -A INPUT -m state ...
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2answers
775 views

I think my PC is being hacked. What should I do? [closed]

I'm afraid I'm being hacked: My Ubuntu is receiving inbound traffic while my PC is disconnected from Ethernet and WIFI, so my question is, how am I receiving inbound traffic? I even have a firewall ...
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0answers
26 views

Ubuntu as a bandwidth throttling box on windows network

I need to test the performance of some applications over different capacity connections (broadband, EFM, LAN extension etc). How would i configure an Ubuntu server to sit between the main network ...
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0answers
49 views

Transparent proxy listening on sub-interfaces

I have iptables and squid on the same box. HTTP traffic doesn't seem to be going through the transparent proxy when I change my rules on the filter table. What is the best point to filter http ...
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0answers
23 views

OpenVPN disables DNS due to firewall

I'm trying to use an OpenVPN service with Network Manager. When I'm on wireless and activate the VPN, it works flawlessly, but when I'm on a wired connection, I have no Internet access. Through trial ...
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1answer
88 views

IP Tables allow HTTP and HTTPS

I am setting up a basic Firewall rules for my Laptop but I cant seem to get HTTP and HTTPS, thus using of the Webbrowser to work. My current rules are like this # 1. Delete all existing rules ...
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0answers
14 views

Subdomains Stopped Working after APF Firewall Install

I've just installed APF Firewall to my Ubuntu 12.04 server. Everything went fine and www.threecreative.co.uk is displaying okay, but none of my subdomains appear to be working. Any thoughts? For now, ...