Ubuntu Networking :: Setting Up And Old Machine As A Firewall?

Oct 12, 2010

I have installed Ubuntu 10.04 Server on an older desktop with the intent of making it into a firewall box. What I would like to do is hook one nic into the modem, and the other nic into my router. I'm not sure if I want to setup the 2 nics as bridged.

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Ubuntu :: UFW Firewall Setting - Login To The Machine Via LAN Computers

Aug 15, 2011

correct settings for UFW on my Ubuntu Desktop 11.04 I am setting upo a webserver and want the security for hosting websites but I also need to login to the machine via my LAN computers. I am concerned about setting it up incorrectly and having people hack my machine.

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Ubuntu Networking :: Setting Up A Router And Firewall For 10.10 Server 64-bit?

Jan 28, 2011

post the "perfect" tutorial for setting up a router and firewall for Ubuntu 10.10 Server 64-bit? I'm kind of a n00b when it comes to Linux, so I get really confused with some things, I have seen things on the ubuntu wiki about this... but it really confuses me =

I'm trying to setup my ubuntu sys as a router and firewall... Internet -> Ubuntu (Router) -> Switch (no DHCP on it) -> Computers I've already setup bind and dhcp3 and got those working perfectly... I've also setup Squid3 and Dansguardian for content filtering (blocking ads and such) and got them working too... I want to set it all up to be transparent, and allow the system itself to function as a powerful firewall router, giving absolutely NO issues to client computers connected, and no speed reduction at all.... I want to setup the firewall to allow all outgoing connections, but block everything incoming (stealth the network)... Forcing all http/s traffic to pass through dansguardian, then to squid...

But am very confused on how to pull this off... The system is running Ubuntu 10.10 Server 64-bit, with 4 GB of RAM, 320 GB SSD, and two 1Gb NIC cards... Sorry if I'm not very clear, I do speak english perfectly, but just kinda new to the "Linux world", I was using SONICWALL but that's getting a little too costly to my network and wanna do a free alternative... Something completely CUSTOM, not using some network security distro.

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Networking :: Setting Up Firewall/locking Down Ip's And Ports?

Jun 29, 2010

I want to lock down my server to allow only certain ip addresses and ports in. I was thinking of doing this through the iptables but someone sugguested I used the hosts.allow and deny files to allow who can access the system. What do people suggest? If I"m trying to ensure no ip's can access my system except the ones I want, how would I do this with just the allow and deny files?

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Ubuntu Networking :: Setting Up Network Firewall Using A Netgear DG834G Router

Jan 12, 2011

could set up a firewall on my linux machine? I have is to connect my router wired to the linux machine and then from the linux machine to my main computer, and obviously routing the internet connection through the linux box as a firewall. I use a Netgear DG834G router

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Networking :: Access Firewall Public IP From Internal NATed DMZ Machine?

May 13, 2010

I could no handle/circumvent on the past week, despite of the several "googling" and documents reading. I will try to mention all needed bits... I'm managing a network with the following structure:

eth0: internal net
eth1: DMZ
eth2: 10 mbit/sec sync line with eight public /29 IP's + a /30 interconnection network. All public IP's must use the interconnection's network gateway.
eth3: ADSL with ppoe with fixed IP (ppp0).

Now, a few extra info:

- All internal traffic is routed through ppp0 except when it's destined for DMZ and public IP's range.
- DMZ traffic is routed either through ppp0 or eth2. This is done by source IP.
- eth2 has on IP from the interconnection network, and six public IP's are also defined on eth2. Command: "ip addr add ...."

[code].....

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Ubuntu Networking :: Setting Up ISA NIC On An Old Machine?

May 20, 2010

Somebody gave me an old Celeron 333MHz system w/ 96 MB RAM and I thought I would set it up as a little torrent server. So I installed Ubuntu server on it, but it does not see the NIC. I know the NIC functions because the person was using it hooked up to a network until a few days ago. Unfortunately, it's an ISA-based NIC and not PCI and my understanding is that I have to pass it IRQ and DMA settings to get it to work. Unfortunately, I wiped the windows 98 partition without thinking of snagging those settings. First of all, lspci does not show the hardware AT ALL. Here's the output I get:

Code:

00:00.0 Host bridge: Intel Corporation 440LX/EX - 82443LX/EX Host bridge (rev 03)
00:01.0 PCI bridge: Intel Corporation 440LX/EX - 82443LX/EX AGP bridge (rev 03)
00:04.0 USB Controller: OPTi Inc. 82C861 (rev 10)

[code]...

The machine is an old 'Compaq Presario 5050' with a really crappy BIOS that doesn't really offer any help. I read a post somewhere that trying to load the 'ne' driver should work, so I tried:

sudo modprobe ne

and it came back saying "no such device".

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Networking :: Setting Up A Mail Notification Nagios On A Ubuntu Machine?

Feb 11, 2011

I I'm currently working on Nagios Core 3.2.2, and I'm trying to set up a mail notification. I already install postfix and mailx. And I'm able to send a mail via Ubuntu. I checked this with the command: echo "mail test" | mailx -s "test subject" mail address.But I don't know what to do next. I'v tried many different suggestions that I found on goolge, but nothing seems to work.

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Networking :: Packets Not Routed Properly After Setting Up Machine As Router?

Aug 13, 2010

I have three machines say A B and C. I want to make machine B as a router for A and C, so that the ping packets from C to A should be going via B. I have directly connected two interfaces(eth4) of A and B and similarly two interfaces(eth5) of B and C. I have even set up a route between B and C. 1. But I am not able to set a route between B and A.2. If I ping A from eth4 of B(viceversa) it works. When I ping B from eth5 of C it work but not the viceversa.3. Also, if I ping from C to A, B receives the packets, but not A.

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Networking :: Setup Firewall / Sys1 Is Not Connected To Firewall For Testing Purpose?

May 18, 2010

I am learning to setup firewall in my home for that i have selected four system(sys1,sys2....sys4) for testing .I have configured sys2 to act as a firewall with two NIC. sys3 and sys4 are inside the firewall . sys1 is not connected to firewall for testing purpose.

the IP assignments are follows :

sys1 : ( fedora, not connected to firewall i am thinking, But i am not sure )

IP : 192.168.2.1 ,
gateway : blank
dns1 : blank
dns2 : blank

sys2 firewall ,IPTABLES )
code....

what happened is that sys1(not connected to firewall) can ssh to sys4(connected,inside firewall),since the rules are written not to ssh form sys1 to sys4..

then I came to know whatever the request I give, It directly goes as sys1 --> sys4. Not as sys1-----> sys2(firewall)---> sys4 .and the firewall is not filtering and processing anything for both inbound and outbound (i think it's my mistake some where). the requests are directly going inside without firewall.

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Ubuntu Servers :: Setting Up NAT Firewall Using IPtables

Nov 30, 2010

I am having a little trouble setting up a NAT firewall using iptables. I have 1 PC dedicated to being the firewall running Ubuntu 10.04 LTS. There are 2 NICs in this PC. One NIC is connected to the modem & the other is hooked into my router, sharing the connection through to the other PC on my LAN. Thing is that I am having troubles setting this up using iptables. I have it sharing the connection, but can't seem to make it forward 2 ports through to my webserver on the LAN. I am also wanting to setup init.d to control iptables. I have been trying to google this, but haven't found anything useful to get this accomplished. I put the following into rc.local to make the forwarding work:

/sbin/iptables -F
/sbin/iptables -N block
/sbin/iptables -A block -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A block -m state --state NEW -i ! eth0 -j ACCEPT
/sbin/iptables -A block -j LOG
/sbin/iptables -A block -j DROP
/sbin/iptables -A INPUT -j block
/sbin/iptables --table nat -A POSTROUTING -o eth0 -j MASQUERADE

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Security :: Setting Up Firewall

Mar 7, 2011

Setting up firewall

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Ubuntu Servers :: Setting Up Gateway / Router And Firewall

Jul 20, 2011

So what I want to do is setup a gateway(or router, idk what Ubuntu refers to it as.). So my set up would be Modem>Server>Switch>Router. I know that I need to set up it up as a DHCP server as well. I would also like to setup it up as a firewall too. I already have two Gbit cards that are already configured. So how do I do this? I already tried one tutorial, but it was old and was for Debian. I also installed ebox, but I couldnt figure that out either.

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General :: Using An Old PPC Machine As A Home Firewall?

Nov 14, 2010

what is the best way to turn a pre 2000 macpro into a home/small office firewall?

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General :: Configuring Machine As A Firewall?

Feb 8, 2010

i have a linux server runnig oracle applications. i need to access this server from putty using ssh through internet. i did by registering my static ip with the dnydns.org and i am able to connect to the server. but now there is no security to authenticate any user as any one knowing the password can login to it. i thought of configuring the firewall of linux server but the client ip`s are not static and they change continiously. so thought of keeping one more pc between the server and the router which will do the work of authenticating. but i am confuse as how to configure it to allow the packets coming from the internet after authenticating and to by pass the packets generated from internal LAN?

i have heared abut freeradius package but i am not sure will it work in my case?

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OpenSUSE Network :: Accessing A Machine Behind A Firewall?

Oct 22, 2010

I'm in the situation where I'm trying to create 2 private networks using ESX server, all behind a NAT router (static ips are used). I used an openSuse11 vm as a router and was able to configure it so that a machine on one private network was able to access the public network. The problem I have now it that I need to be able to access a machine on the private network from the public network using a different set of IP's.

So if a machine in the private network has an IP of 10.1.0.222 I should be able to ping it using 10.99.0.222 or some other IP. I have never done this before and after reading up on iptables and linux routing I feel more confused than before. Is it possible to add IPs to eth0 (public) and have them mapped to machines on a private network eth1 or eth

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Debian Multimedia :: Setting Up Evolution Behind A University Firewall?

Feb 10, 2010

I am behind a university http proxy (squid) server and all of my internet connections have to go through it. I haven't been able to find any setting in Evolution that allows me to specify my proxy settings.

Searching on Google, it suggested that evolution can't work behind proxies and works only with direct connections to the internet.

I wanted to know if there is any way round this problem. I tried posting the same question on gnome list and gnome hacking list and no reply has come so far.

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Fedora :: Can Computer Be Hacked When The Firewall Is In The Default Setting

Apr 5, 2011

Am I safe when surfing the web with default Firewall setting? Can My Computer be hacked when the firewall is in the default setting? I have no knowledge on configuring Firewalls

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Ubuntu Installation :: Setting Up Triple Boot Machine?

Apr 29, 2010

I i'm having trouble setting up my triple boot machine. I have Windows 7 and Mac OSX on two seperatate hard disks and they are dual booting fine with the chameleon bootloader. I just attempted to install ubuntu from liveCD which i downloaded and burned from the ubuntu website. During intallation i the option to "install side by side to windows" and resized the windows partition to make room for Ubuntu(250GB of 1TB), i also selected the option to disable the GRUB bootloader because i want to use chameleon. The installer completed successfully and the computer rebooted but chameleon, Mac OSX or windows (my partition for windows is 250GB smaller) won't recognize the partition.

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Ubuntu :: Setting Up Remote Administration On A Distant Machine?

Oct 30, 2010

I'm try to assess the viability of of setting up remote administration on a distant machine. Just for background, the computer I wish to administer is located on a boat in Southern Ireland while I'm in SE England. Sadly, the the boat operator is a far better fisherman than computer user and every now and then some rogue sensor numbers get captured by the boat's computer and these eventually need operator intervention. Anyone who has tried to talk a non PC literate user through correction routines over a dodgy mobile telephone while the said user is trying to operate mouse/keyboard in an Atlantic swell will appreciate the problem.

However, there is a fairly good mobile phone broadband signal available in the area so I was wondering if there was anyway I could set up a point to point connection with the boat over this medium. That would allow me to administer the machine remotely.

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General :: Setting Up A Machine With 3 Monitors?

Jan 20, 2010

link to an up-to-date tutorial for setting up Linux with 3 monitors? Specifically, I want to set up 2 different nvidia video cards with 3 monitors. I can already do 2 monitors on 1 video card, so I am not interested in those tutorials.

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Ubuntu Networking :: Access Machine Via Windows Machine - Samba Password Reset?

Feb 13, 2011

I try to access my ubuntu machine via my Windows Machine (Samba Server on Ubuntu Machine). Anytime I try to access the machine it asks me for my password...I enter it but it says it is invalid....is there anyway to reset it? I have already tried to remove and purge everything Samba related and then tried reinstalling, but that still didn't do anything

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Ubuntu Networking :: Cannot Ping KK Machine, Internet/network ON Machine Works?

Mar 18, 2010

I have an ubuntu kk laptop connected via wireless to my mixed network (xp, win7, other ubuntu), but i can not ping said machine or connect via ssh. Internet and smb-browsing ON this machine work, as does pinging FROM it. If this was a windows machine, I'd say a firewall is in the way, but since it's a vanilla karmic install, this should not be the case (or should it?).

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Ubuntu Networking :: Change Folder Names Over A Network On A Machine Using A Mac Machine

Jul 24, 2010

It seems whenever i create a folder it creates the folder as untitled folder, but i can't change the folder name it just says "you don't have permission to rename item" but yet i created the folder and it is there. One thing i have noticed is that once i enter a folder it won't even let me move the folder.

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Ubuntu :: Virtual Machine Networking / Network Not Working After Copied Machine?

Dec 3, 2008

I have ubuntu-8.04.1-server installed on virtual machine. It works perfect. Now, I made copy of this virtual machine. I started that copied machine and it works fine, except one thing: network does not work!
I have several others VMs with freeBSD, openBSD or Windows on it, but only ubuntu machine hes network problem after coping. I tried some other VM with ubuntu on it - same problem! I downloaded VM with ubuntu - same problem.I take a look into /etc/network/interfaces file and it looks just as it should (same as before coping) but ifconfig command returns parameters for lo only (before coping there was eth0 and lo).

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Software :: Setting Up Tightvnc For Multiple Users On Same Machine?

Nov 26, 2010

I am searching for a way to have multiple sessions or users on the same vnc server. I have a machine that I need to remotely access as root (for admin purposes) and as myself (as the normal user) the rest of the time. I probably will never have to remotely login at the same time as both root and myself (I am not that multitasking!)I searched the web for almost 1 hour without finding anything useful... Right now my /etc/rc.d/rc.vncservers.conf looks like:

[code].....

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Ubuntu Networking :: Way To Share Folder From Machine To Windows Machine

Aug 28, 2010

I am trying to establish the easiest way to share a folder from an Ubuntu machine to a Windows machine.In the past I have added things to smb.conf and that has all worked fine but what I am trying to do is to figure out what the "new user" way of doing this is so that when I am helping other people I know I am getting them to do the simplest thing.I completely removed samba and reinstalled it so that I didn't have any configuration. Right clicked on a folder and selected "Sharing Options" ticked the "Share this folder box" gave it a name and a comment and ticked the other two boxes.

When I went to the windows laptop then it kept asking for a username/password and nothing worked.Back on the ubuntu machine I did sudo smbpasswd -a [username] and created a blank password. Now from the windows machine I can access the shared folder.Is the smbpasswd step still required? It's very confusing for a new user as there is no suggestion that anything other than right clicking on the folder and choosing the options you want would be required. Is it something to do with the fact that this is an ubuntu machine that has gradually been upgraded through versions and this problem wouldn't have been there from a new install?

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Ubuntu :: Setting Up A Cron Job Creates A Tunnel To Remote Machine To Work Correctly On 9.10?

Jan 12, 2010

I am having some trouble setting up a cron job that creates a tunnel to my remote machine to work correctly on Ubuntu 9.10. The setup looks like the following:

(1) myscript.sh (executable)
Code:
#!/bin/bash
ssh -2 -x -i /home/user/.ssh/id_rsa.prv -L 3128:myremotemachine:3128 myaccount@myremotemachine
(2) crontab -e, added the following lines:

[Code]...

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Ubuntu Servers :: Setting SAMBA Server Correctly - Can Only Access Files From The Win 7 Machine

May 31, 2010

Im having trouble setting my SAMBA server correctly. I have two Win machines, one with WIN7 and one with XP. I have one Ubuntu machine and Ubuntu Server 10.04. My problem is that I can only acess files from the Win 7 Machine. When I try to map out the shared dirs on my serverI get asked for user and password, when I enter my creditensials it dosent help.. What to do? I used the sample smb.conf file and open for no restrictions..

[Code]....

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Server :: Samba - Setting Up Shares For Windows Machine On CentOS?

May 10, 2010

Can anyone point me in the direction of setting up shares for windows machines on centos. I have found a few document but never managed to get it up and running correctly. I need to be able to get access to subfolder etc for different users. Is there any way of doing it with some sort of gui?

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