Ubuntu Servers :: Router With Wifi And A Firewall

Aug 9, 2010

My isp gave me a router which has wifi.

I added an ubuntu box acting as a router, so the layout is this:

Now, the lan has subnet, and the external interface of the router is in the subnet

So the problem is that the wifi assigns ip's which doesnt belong or get filtered through my router/firewall...

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Ubuntu Servers :: Firewall / Router Forward Ports

Sep 8, 2010

I have linux server setup on a network with 2 interfaces. One (eth0) is connected to the regular network and the other (eth1) has a DHCP server and transparent web cache listening on it. The machines connected on the eth1 side are on a different subnet and the linux server is there gateway. Untrusted machines are introduced to this network to keep them isolated.

This isolation works well, too well. There are a small set of resources on the regular network I would like to make available to machines on untrustworthy network. I think I need to use iptables but alas I've had no luck in piecing together the command I need (in one case looking myself out and having to physically reset the machine).

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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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Ubuntu Networking :: Share Wifi Over LAN To Wifi Router?

Sep 1, 2011

I have a pc which has 2 network cards, 1 wifi and 1 ethernet card.

I'm using wifi card to connect to wifi network (internet) and i'm planing to share this wifi/internet connection via ethernet to wireless router (siemens sx763) so i can have internet on my other devices, e.g. mobile phone, laptop.

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Networking :: Can't Access Public Wifi BUT Wifi Works On Router At Home?

May 13, 2009

the only error message I can find comes from "dmesg|tail"all it shows is
"no IPv6 router"any body know what is going on here or where where to look for more clues the next time I get around public wifi Oh the windoze washers and apple polishers don't seem to have any problems at all

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Ubuntu Networking :: Setup A Router With Firewall?

Feb 9, 2010

I want to setup a router with firewall on ubuntu box that will connect windows pcs one serving as outside source and one serving as inside target.

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Ubuntu Security :: Firewall Without Router - No DHCP

Feb 15, 2011

I want to have a firewall that is connected to my modem and router and have it function as just a firewall no dhcp no routing is that possible?

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Ubuntu Networking :: As Firewall - Router With Aircard - Wwan

Apr 23, 2010

I have seen tutorials on setting up a secured firewall/router/gateway using ubuntu server as the platform. However, I am wondering if anyone has had experience with using an aircard (wireless broadband card via usb) to set up a router.

Which card do you recommend? Any precautions? Any specific code already written to automatically recognize mobile broadband cards and restart the connection if it goes stale?

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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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Ubuntu Security :: Iptables Firewall Logs Router?

Apr 5, 2011

In an effort to learn more about firewalls and iptables I have left behind gui set-up tools and have setup a firewall using iptables that logs to its own file. The firewall is as follows:

:TCP - [0:0]


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Ubuntu Networking :: How To Set Up A Gateway/router And Firewall On Server

Jul 20, 2011

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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Ubuntu :: Ad Hoc No Internet - Firewall Not Active And Router Is Enabled

Nov 19, 2010

I am establishing ad hoc connection between two PCs

1. LAPTOP: WIFI adapter OS: Ubuntu 9.10 Connection name: trial Address: Subnet: Gateway:

2. PC with wired Internet connection + WIFI adapter OS: Windows XP Connection name and parameters same as above except ip:

I can see trial is getting connected with excellent strength. When i try to run an Internet on Ubuntu it is not working. Firewall is not active and Router is enabled.

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OpenSUSE Network :: 11.2 Acting As Router Firewall

Mar 29, 2010

switched recently to 11.2 and it works fine for me as workstation I want to set up a router separating a part of the network and also acting as a firewall/proxy... Configured 2 Ethernet Interfaces, checked Ip forwarding in Yast but it does not forward the packets from the "internal" to the "external" network. Hovewer after I set up my router as default for machines on internal network I can ping the external interface but no adress on external network (particularly the one of the default router) !!! From the router I can reach both networks and the net via default gateway on external. Tried to:

a) switch firewall completely off
b) iptables -P FORWARD ACCEPT
c) masquarading internal adresses to the external network

my interfaces configuration looks like:
eth0 Link encap:Ethernet HWaddr 00:13:D4:E3:A2:7B
inet addr: Bcast: Mask:
inet6 addr: fe80::213:d4ff:fee3:a27b/64 Scope:Link


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Security :: Is A Firewall Needed If Get All Traffic Through A Router

Aug 8, 2010

I get all my traffic from my router, as this computer seldom moves. So is there a use for a firewall?I am not sure, because when I scan my IP address with nmap, no matter what the changes I make in the firewall, it is always the same scan...cannot fingerprint OS...and all closed ports.The all closed ports thing only changes when i torrent, then i get a wide open port.

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Security :: Firewall Infront Of Router Setup?

Mar 9, 2011

I am trying to setup a firewall using Centos 5.5. The machine has 2 NICs, one connecting to the ISP/Modem and the other connected to a DIR-655 wireless router. The nic is connecting to the internet port on the router.

I do not want DHCP on the Firewall machine but on the wireless router.

[ISP/Modem]<--->[machine eth0]<--->[machine eht1]<--->[DIR-655 internet port]
IP from ISP Dynamic

IP's on the DIR-655 LAN will be network lets say.

I have setup routes on the eth0 and
and added to eth1.

I can ping eth0 and eth1 but cannot ping

this setup is not actually connected to the internet so I disabled iptables to try testing the ping and still no good.

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Security :: More Secure Than Router's Not Configurable Firewall

Apr 20, 2011

There are routers with firewalls which you cannot configure - you just use those routers and get some protection from Internet attacks. Is it possible to configure iptables on GNU/Linux machine so that you'll get better protection than the protection you get from those kind of routers?

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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 :: Capture And Log All LAN Traffic - No Access To Router Or Firewall

Jun 10, 2009

I am looking for a solution for our LAN traffic monitoring and would like to use some opensource linux application. I have a linux box with two NIC cards and what I thought is the following: Our setup is as follows. Internet comes in through the router and into the firewall. From the firewall it goes into our switch and distributed among the workstations.
I have no access to the router or the firewall as they are centrally configured. I would like to place a device into the loop through which I could monitor the LAN traffic.

Can I put a linux box between the firewall and the switch and have all packets going through registered and logged? I have a proxy server (non transparent) and that captures some but not all. I would like to get all packets registered without interfering with the LAN etc.

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Hardware :: IPhone 3G In Modemmode - Router / Firewall Distribution

Sep 14, 2010

I want to connect my home network with the iPhone via UMTS to the internet. I'm searching a Router and Firewall Distribution, which is able to use the iPhone in modem-mode to connect to the internet.
Does anybody know such a Distro which can realize that?

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Networking :: Building Router Equipped With Firewall And Acl Management?

Jul 6, 2010

I am trying to do my graduation project, it's labeled under "linux secure router", and I should build a linux based router equipped with firewall and ACL management...Some people advice me to use linux ubuntu distribution todo this I try to do that but I don't know where to start form

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Networking :: Firewall As Router - Pros Versus Cons

Jan 27, 2010

I'm mentoring my local high school's IT club as they prepare to participate in a cyberdefense competition (see IT Olympics). Generally we are given four boxes and need to set up a network that provides certain services (which services change from year to year, but usually include a web server, email server, FTP server, and an application server of some sort) and support client PCs that connect from the WAN. The red team then tries to break into our network to steal "flags" from our servers and to set their own "flags" on our servers.

Generally we set up the firewall with two network interface cards (one to the WAN and one to our LAN), and connect the LAN NIC to a router, which then connects to the other three boxes. But we do have the option of installing additional NICs in the firewall and configuring it as a router. I can't shake the feeling that there is a security advantage to such a configuration, but I can't say what that advantage is. Perhaps something with configuring ipTables on the internal boxes to accept connections only from the firewall's NIC, and then only for the services we want that box to support (to prevent an intruder from connecting directly from one box to another)?

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Networking :: Unable To Open Port In Router Or Firewall?

Jan 26, 2010

I am trying to make a vnc connection from pc #2 to pc #1. Pc #1 is a debian pc behind a zyxel router (P-2602HW-D1A). Pc #2 is a windows xp pc another place at the internet.I have configured the zyxel router to forward incomming trafic on port 5902 to the local ip-adress of the debian box. The debian box is running a vnc server, listening on port 5902.But i dosn?t work.I have tryed to scan the zyxel routers ipadress on port 5902 from the internet, but the scanner says that the port is closed.The vnc server on pc #1 is working fine on the local network. I can connect to the server from a pc on the same side of the zyxel router.Is it deffenitly a router problem, or could it have something to do with debians own firewall?

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General :: Configure Centos 5.4 To Work As A Router And Firewall On Its Own?

Jun 15, 2011

how to setup centos to act as router and firewall at our office i just installed the os now i dont know where to go from here i have all the isp adresses,dns and gateway any assistance coz am really interested in learning linux thanxs iused some instructions on this site [URL] and when i try the /sysctl.config on my terminal now i get the message permission denied

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General :: Installing Firewall / Gateway Into Linksys Router To Protect Windows?

Apr 1, 2010

story is my brother is a dindows lover (gamer) and hes been gettin attacked by virus's,etc cause he runs his Vista setup with no firewall or antivirus

He says the firewall,etc slows down the PC too much for gaming He doesnt want to use Linux as his games wont play on Linux as on dindows

He wants to know if you can install a Linux firewall/gateway or whatever into his Linksys WRT54GC router and thus protect his PC without using a firewall or av in it.

EDIT: precisely; he has a Linksys wireless-G connected to a always-on Verizon Westel 6100G modem so its a wired connection, not wireless

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Security :: Public Facing OpenVPN - Open Any Ports On The Router / Firewall

Feb 14, 2011

Within the documentation of example OpenVPN setups there is a setup that shows an OpenVPN Server with two network interfaces. One interfaces is plugged into the public internet network and the second interface is plugged into the private network.

Normally I assume that it would be best to place the OpenVPN system inside the network behind the router and firewall and open only the ports needed on the router to allow access to the OpenVPN system. All other router ports would be closed. This is the first example they show. To see what I am talking about see page(s) 6-7 here -> [URL]

If one were to use the two interface public facing setup, when would that setup best be justified? I guess if you didn't want to open any ports on the router/firewall then this could be justified but then you have to lock down this public system individually instead of having it protected by the network firewall.

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Fedora Networking :: OpenVPN Timeout - Error From NetworkManager - Connect To My Router/firewall

Mar 13, 2011

I'm getting a timeout error from NetworkManager when attempting to connect to my router/firewall.

Excerpt from /var/log/messages attached.

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Ubuntu :: 9.10 Wifi - Can't Connect To My Router ?

Feb 16, 2010

I have been experiencing slight problems while attempting to connect to the internet via a wireless router. I can connect to my router perfectly fine on Vista and I could connect to my friends router while I was in Ubuntu, but I can't connect to my router while on Ubuntu. I've been entering the same code that will work when I'm in Vista, but it wont work while in Ubuntu.

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OpenSUSE Wireless :: WiFi Printer Mode Off In Yast With Firewall

May 5, 2011

I have WiFi printer, HP DeskJet F4500. If suse firewall is on, yast doesn't see that printer. If I turn firewall off, Yast sees printer and install it just fine. Problem is, that when i start firawall again, yast denies whole printer and turn it off mode in Yast. What firewall rule i have to make to get this work?

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Ubuntu Networking :: Cannot Connect To WiFi Router

Mar 15, 2011

I think I have unique problem. I have a d-link DWL G510 rev c.(Austrailian) WiFi card in my pc which is detected as


Network controller [0280]: RaLink RT2561/RT61 rev B 802.11g [1814:0302] in lspci -nn.

iwconfig shows:


lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSIDff/any
Mode:Managed Access Point: Not-Associated Tx-Power=6 dBm
Retry long limit:7 RTS thrff Fragment thrff
Power Managementff
ppp0 no wireless extensions.

Now sometimes it detects my wifi router and shows its ssid in nm-applet. but when I try to connect, it tries for 3 or 4 minutes and then fails. for most of time it even does not finds my router.

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Ubuntu Networking :: Logging Into WiFi Router

Jun 17, 2011

I have a Dell Studio XPS15 laptop running 11.04 which works flawlessly with my router (it's a broadcom card btw). Now I'm setting up a new laptop for my Father-in-law which is a Dell Inspiron 15 which has intel Centrino 1000 wireless. I've installed and setup 11.04 on it. Everything runs great except..

Now it can see all the access points around so I assume the wireless card is properly detected and working. But when I try to log into my router and give it my password, it just keeps trying to connect and can't. I've double checked the settings with my own laptop and everything seems the same. why it won't log in? I'm leaving it as a dual boot with Win7 and I know that Win7 will log into the same router with the same password.

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