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

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7
votes
3answers
1k views

How can a non-geek set up a proper firewall?

Maybe a non-geek that knows of the existence of a firewall is already some kind of a nerd. If you have been a windows-user then it was rather easy to set up a firewall (I don't know if it was a good ...
11
votes
3answers
9k views

How can I open a range of ports in ubuntu using (g)ufw for use with membase?

I have membase (membase.org) installed and I have to open a bunch of ports in order for the cluster to function Adding the single ports was easy enough but I can't work out how to open the range ...
2
votes
3answers
498 views

Is it possible to configure Ubuntu as a software firewall?

I have some systems running on Ubuntu in the private IP range 192.168.2.0-255 . These systems are connected to a switch and the switch is connected to the ISP's modem. Neither the switch nor the ...
8
votes
3answers
30k views

How to enable ufw firewall to allow icmp response?

I have a series of Ubuntu 10.04 servers and each one has ufw firewall enabled. I have allowed port 22 (for SSH) and 80 (if it's a webserver). My question is that I am trying to enable icmp echo ...
3
votes
5answers
2k views

Cannot ssh/ping an Ubuntu machine over WiFi

I have an Ubuntu 10.04 running on a laptop, connected to a local network via WiFi. This machine does not respond to pings/ssh connect requests, as if it was firewalled. However, if I ssh from this ...
1
vote
1answer
932 views

Ubuntu Linux UFW Firewall, Local Intranet Access

At home, I have Ubuntu server with the UFW firewall. What command do I type to turn on local intranet access to my web server, but keep the outside world out from my DSL modem?
0
votes
1answer
716 views

Ufw causing trouble with DHCP or WPA? [closed]

It appears that enabling UFW is causing my network connection to drop periodically on a WPA-Enterprise network, according to the network-manager GUI app (and the lack of a server response to web ...
0
votes
2answers
649 views

Trouble with UFW blocking stuff from NAT machine to inside of NAT

I've got a NAT box (Ubu 10.04) running ufw with the following sudo ufw status verbose: Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To ...
8
votes
2answers
7k views

How to set up an Ubuntu 10.04 machine to accept ssh requests only from within the local network?

I am about to install 10.04 (from bare metal to replace 9.04) and I want to set it up so that I can shh into the machine, but only from other machines on my local network. (I.e., I want to reject all ...
14
votes
3answers
62k views

How do I know if my firewall is on?

I installed Firestarter, and configured my firewall. But I'm in doubt : On boot, I sometimes see a [FAIL] marker, and to the left, I guess it was something like "start firewall". I can't be sure ...