A networking program that controls the incoming and outcoming stream of data in a computer.

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6
votes
2answers
562 views

Configuring a vncserver so it's only accessible from my ssh tunnel

Since I use vnc through an ssh tunnel, is there any way I can block the open vnc port that the remote machine is listening on without it affecting my ability to use the ssh tunnel? Both machines are ...
2
votes
3answers
376 views

Port monitoring on GNU/Linux based NAT router

I am using a Ubuntu machine as a NAT router. How can I find out the following: the ports on which the LAN machines are listening or communicating (both tcp and udp); which local machines have ...
2
votes
1answer
2k views

iptables/pf rule to only allow XY application/user?

I think there is no iptables/pf solution to only allow an XY application on e.g.: outbound tcp port 80, eth0. So if I have a userid: "500" then how could I block any other communications then the ...
1
vote
1answer
1k views

I can't figure out how to install Firestarter Fedora

I am feeling stupid. I have been searching for 3 hours with no success. I installed Fedora 14 and tried to do yum install firestarter but the package was not found. I also tried from a GUI and found ...
7
votes
1answer
519 views

Opening port 80 but remain secure

I have a standard installation of Ubuntu 10.04, and have installed the LAMP stack so I can do some web development locally. On my router I have opened port 80 so I can develop with external services ...
7
votes
2answers
11k views

iptables: allow certain ips and block all other connection

How do I allow certain ips and block all other connection in iptables?
2
votes
1answer
446 views

Is there any PF log parser for FreeBSD

I am runing FreeBSD 8 stable with PF as firewall, I am looking for any tool for parsing PF log's.
3
votes
1answer
172 views

Linux App that monitors log and add rules to iptables

I used to use a linux software that monitors logs like http, ssh, etc and if it detects that someone is trying to use brute force, it blocks that ip by adding a rule to iptables. I forgot what that ...
2
votes
1answer
477 views

tun0+ iptables rule

I'm trying to figure out what that + sign means in a rule such as this: -A FORWARD -i tun0+ -j ACCEPT I'm pretty positive it relates to vpn. I noticed a /dev/net/tun interface and a tun0 in ...
-1
votes
1answer
2k views

How to block HTTPS site using RHEL Squid?

I want to block HTTPS sites using Linux Squid server. How can I do this?
2
votes
4answers
502 views

What does this iptables command do?

Does iptables -I INPUT -j ACCEPT open all ports?
10
votes
3answers
3k views

Is there a way to find which iptables rule was responsible for dropping a packet?

I have a system that came with a firewall already in place. The firewall consists of over 1000 iptables rules. One of these rule is dropping packets I don't want dropped. (I know this because I did ...
3
votes
1answer
379 views

1000 iptables entries on CentOS?

I just got a new dedicated server with CentOS and I'm trying to debug some network problems. In doing so, I found over one thousand iptables entries. Is this the default on a CentOS system? Is there ...
1
vote
2answers
852 views

iptables rule for local network with free internet blocking unrequested connection from internet to server?

I have a home server (with slackware 13) with a eth0 for the local network and a eth1 for the internet (cable modem with dynamic ip). While I do want to learn more about iptables I am still on the ...
4
votes
3answers
325 views

Is it possible to simulate “no external access” from a Linux machine when developing?

Sometimes I upload an application to a server that doesn't have external internet access. I would like to create the same environment in my machine for testing some features in the application and ...
3
votes
3answers
276 views

Turning an old computer into a network firewall

I have an old Dell Dimension with two ethernet cards, and I need to turn it into a firewall. I've tried FireStarter and IPCop, but I don't think I'm setting them up right. Here's the setup that I'm ...
0
votes
2answers
138 views

Where to handle packets between clients?

"Server": 192.168.1.1 I want to "theoretically" disable that the clients can "ping" each other. Can i use an iptables rule for it? e.g.: iptables -A FORWARD -m iprange --src-range ...
1
vote
1answer
1k views

IPTABLES rule for separating users

I have an OpenWrt 10.03 router [ IP: 192.168.1.1 ], and it has a DHCP server pool: 192.168.1.0/24 - clients are using it through wireless/wired connection. Ok! Here's the catch: I need to separate ...
1
vote
2answers
649 views

squid (reverse proxy) configuration

I would like to configure squid in such way, so that only specific (public) ip (reverse proxy), could connect to the server, but I don't know how... can someone tell me how to do this?
6
votes
3answers
368 views

SpamAssassin Under Linux VPS

I am getting bald with this guys: On a Linux VPS (CentOS), I have setup a mail server (Exim+Dovecot+Clamav+SpamAssassin) but scanning mail for spam using SpamAssassin is proving to be a challenge. I ...
-1
votes
1answer
1k views

How can I open port 21 on a Linux VM?

I need to open port 21 on a Linux (CentOS 5) virtual machine I have. I have tried several Google solutions, but none are working. I was wondering if someone could tell me how to do this. Below is ...
1
vote
1answer
690 views

Could not connect to host 127.0.0.1: Connection refused

Could not connect to host 127.0.0.1: Connection refused. - I am getting this error message on ktorrent on slackware 13.1 and the torrents cannot start. I tried to reconfigure the ktorrent prefernces, ...
1
vote
1answer
480 views

How would I go about getting UPnP working on a Slackware server/firewall?

I'm a long time fan of Slackware and I've always had a machine serving as my main server/firewall with the latest version installed. I have it now but I'm struggling to find information on how to ...
6
votes
4answers
3k views

Debian: Which firewall for a newbie?

I have to install a firewall on my server (so without X Server). It's a debian lenny. If it is possible, I want to avoid the use of iptables. Is there a way to install/configure a firewall for a ...
4
votes
3answers
641 views

tunneling VNC/rdesktop over ssh

I'm having a friend behind a firewall, with a windows computer. I'm having a Linux machine at home which is not behind a firewall. I want to have an rdesktop connection to his machine, without using ...
5
votes
1answer
846 views

ipfw : Traffic Shaping

I'm not sure what but it seems like I'm doing something wrong... my objective is to be able to limit some of my traffic, to be exact www traffic. One of my clients os running what's called a ...
3
votes
3answers
177 views

Firewall change control

At the moment I'm using a Python script to generate iptables rules. Each set of changes gets committed to a git repository before deployment so there's a trace of who changed what and why. What ...
2
votes
1answer
324 views

Learning about iptables: Is this Slicehost example any good?

In preparation to eventually launch my first website, I've been playing with Ubuntu Lucid Server in a VM on my WinXP machine. I've been alternating between the Linode and Slicehost tutorials/articles ...
2
votes
6answers
397 views

Recommend a reading for learning Linux firewalls configuration for beginner? [closed]

I am using Linux at home and want to be able to configure firewall. I would like to understand what I am doing not just copy paste some rules from internet :).