Ubuntu Networking :: Using Lan And Internet Simulataneously Through A Single NIC?
Dec 22, 2010
I have been using ubuntu for more than 3 months now . I was wondering if could use LAN and Internet simultaneously in windows, why that should not work in ubuntu? I tried as much as I could, searched different forum and thought there is no way I can get around with it until recently I found a solution in a forum. For your information I use ppoe for connecting to Internet.
The solution was as simple as running this simple command sudo ifconfig eth0 192.168.x.x netmask 255.x.x.xI have replaced those x with my desired number. It worked like a charm! Now I could browse LAN shares and Internet simultaneously! How to do it and forget it? I mean I don't want to do it every time I dial my connection.
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Jul 8, 2011
I have a weird issue with source routing on a linux box.The plan goes like this:I have 2 internet providers at my office and i want to use a single router to route them both ( i don't need load balancing or failover). I just want access to either provider based on the ip i use on my pc. The first provider, let's call it RDS, is simple: i've got an RDS_IP, RDS_MASK and RDS_GW.The second provider is complicated, we'll call it INES. I have a INES_IP, INES_MASK, INES_GW and they also gave me a subnet of public ip's: ILAN_NET which i have to route myself through INES_IP.I also have a third nic with an local ip: LAN_NET and an alias for the INES subnet: ILAN_NETthe router has dhcp enabled, giving by default ip's from LAN_NET and using the default gw, RDSI have snat for the LAN_NET to go through RDS.
If i enter an ip from the ILAN_NET, instead of routing in through the INES_GW, it also goes through RDS_GW.the routing i've used for about 5 months has worked perfectly untill one day, when it just stopped. this is my setup:ip route add $RDS_MASK dev $RDS_IF src $RDS_IP table rdsip route add default via $RDS_GW table rdsip route add $INES_MASK dev $INES_IF src $INES_IP table inesip route add default via $INES_GW table inesip route add default via $RDS_GWip rule add from $RDS_IP table rdsip rule add from $INES_IP table inesip route add $LAN_NET dev $LAN_IF table rdsip route add 127.0.0.0/8 dev lo table rdsip route add $ILAN_NET dev $ILAN_IF table inesip route add 127.0.0.0/8 dev lo table ineswhat puzzles me the most is that this setup has worked, and now it doesn't .... without any changes on the router.I've tried everything save for a format/reinstall.
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Jan 17, 2011
I have a Lucid Ubuntu installed on my home PC with two user accounts, AmHero and simple. I would like to have all internet access disabled when my kids login with the 'simple' userid. And yes, internet should work when I login using AmHero. I tried this:
[URL]
..but this does not work and gives some errors on the terminal.
I can paste the errors, though I am not sure this will even work as I found this in an old post.
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Oct 13, 2010
I have question about the UNIX sockets. my goal is to connect multiple sockets from a single client to a single server and keep them open...I'm not sure if that is possible to create or not. Do you have any suggestion or an example of code?
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Oct 28, 2010
I have a good question. I have a friend that lives in an area where he cannot receive DSL or Cable internet. He has a phone line, and physically able to get DSL, but the company won't give him service. He has Verizon wireless, but the reception is bad and his service gets dropped too much.
I however, have DSL 3.0Mbps and want to know how I could get him a DSL modem to dial up to my server at my house and receive internet. I know that I would probably need two phone lines to do this, but apart from that.
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Apr 23, 2011
Can I have two ubuntu desktop in a single installed ubuntu9.10 such that two desktop has different ipaddress?
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Sep 1, 2010
I am trying to connect my desktop to my laptop over a non-internet connected LAN, but when i enable the LAN connection on my desktop (the one with the wireless) its internet stops working.
it is a very similar problem to this except that i am using ubuntu for the machine with the two connections.
right now i have my wireless on the 192.168.1.* address space, while the LAN is to be on 192.168.5.*
note: my goal is not to share internet with my laptop, just be able to connect to it and the internet at the same time.
desktop: ubuntu 9.10 , wireless and LAN
laptop: windows xp, LAN only
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Sep 25, 2010
My machine has ONE ethernet card and is on a LAN.IP address is assigned to hosts using DHCP.I can have more than one MAC address on LAN by running Virtual Machine and setting network to bridged. This way, my virtual machine simply acts like there is one more machine in the network.Running VMWare for this job is a a bit heavy on resources. Is there a way so that I can I can have 2 or more ip addresses with different MAC address on the same machine without having to run VirtualBox.
By googling, I think its related to bridging and tap. And, I am sure thatts NOT IP-ALIASING because in ip-aliasing both the ip addresses have the same MAC address.Basically, I want my system to have interfaces like:-eth0 - which was originally presentlo- thats always present :|newint0 - New interface with new MAC address and IP addresses which can access my LAN directly. Its like if I bind, let us suppose curl to this interface, its like a different connection
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May 4, 2009
Here is my network setup:
Internet <-> [public IP] Router [192.168.x.x] <-> Local
Local <-> DMZ
Local <-> HostB
Local <-> HostC
I have a system set up as a DMZ which works great for accessing SSH and other various services. I have a dyndns account that points to my public IP and allows me to access my DMZ box from around the world. I would like to make a subdomain of my current dyndns account and point it to HostB so that it can host a webserver on it, and have another subdomain point to HostC with a separate webserver on it. each would have SSH, FTP, Etc and have to not conflict with one another behind one IP. I don't even know if it is possible, but it seems like if there is a request for dev.host.homelinux.com that packet would have to hit [URL]and could be iptable'd to be routed to the appropriate local machine somehow.
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May 25, 2011
I'm trying to set up a wireless AP with Internet sharing. I currently have the AP setup with hostapd and a dhcp server. The clients can connect but there is not Internet sharing. Now my situation is somewhat uniqe in that my internet connection is my teathered android cell phone. The tether app is azilink and i use openvpn to create a virtual networking interface(tun0).
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Jan 14, 2010
I've got a co-worker who is trying to connect multiple devices to his wireless router - Xbox, Wii, TV, Dishnetwork box, etc. Not all of the devices are wireless however. He's had several thoughts on how to get this done and I know very little about this kind of thing so I thought I'd ask some of you.
His first thought was to buy a multi port bridge, but he doesn't like any of the ones he's seen so far.The other thought was to connect all of the devices to a switch and then use a single bridge, but he isn't sure if this would work.
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Feb 1, 2010
On this box I have Two seperate Ubuntu installations. Recently in both I seem to be having the same problem. I initially can connect to the internet as per normal and use any internet application. But after a period of time, sometimes just minutes, sometimes hours, even though the icon says connected, I cant update pages or send emails etc because there is no actual connection. My Physical connection is good I know - My Ubuntu laptop and Windows gamming PC connect fine during this period. So
Does this suggest an intermittent hardware fault or is there some thing in Ubuntu I can check to make sure that it is setup correctly and nothing has been corrupted? I am a lay PC person - I dont really want to be command prompting - Plug & Play and Point & Click is my limit.
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Oct 21, 2010
I tried to install Xubuntu 10.10 Maverick as dual boot on my laptop. However when xubuntu is on, I can't find a way to connect to internet. When I try the 2 arrows on the up-right corner the option for wireless is deemed. I tried offline/online, that did not work either. when I click the firefox It says you are not connected.
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May 1, 2011
I seem to have is trying to get the internet to work. I can go to ..... ect but when I try to run playonlinux it says you do not seem to be connected to the internet, please post if you have anything useful, as I said I am very new to linux so be as detailed as possible.
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Jan 23, 2011
I've been trying to set multiple IP my Fedora 14 but nothing seems to work. Upon browsing the net, I found there are two ways for it. One is eth0:0~eth0:n nd another is eth0-range0. All are configs under network-scripts. But neither of them worked for me. Even grabbing a working example from my live server doesn't do the trick (though the server is a CentOS 5.5).
Currently using eth0-range0
ONBOOT=yes
IPADDR_START=192.168.1.127
[code]...
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Sep 20, 2010
I've been trying to create a simple htb qdisc on my computer for learning purposes, but it does not seem to be working as I want it to. Ive made this script that creates a simple qdisc scheme and assigns filters to it:
tc qdisc add dev $ETH root handle 1:0 htb default 1
tc class add dev $ETH parent 1:0 classid 1:1 htb rate 20kbps ceil 0kbps
tc class add dev $ETH parent 1:0 classid 1:2 htb rate 30kbps ceil 100kbps
tc class add dev $ETH parent 1:0 classid 1:3 htb rate 10kbps ceil 100kbps
[code]....
I want it to simply shape packets on my single machine so that when I go to view web pages it will limit the download rate, same thing for p21 ftp and 443 https. I just want to try out how it works and use these trial to get a hang of it, but I noticed so far that its not limiting port 80 at all.
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Feb 21, 2011
trying to configure a transparent proxy with squid (and filter content with dansguardian) in Debian/Ubuntu. If i configure firefox to use it, it runs ok. I had seen a lot of iptables rules to use fowarding proxy to a lan, but i would like to use squid and dansguardin in a single pc that run them and filter web content.
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Jan 14, 2010
Excuse me if such thread exists already, i carefully searched the forum so i wont create a second one concerning the following problem:So i downloaded (on my new fresh Fujitsu SIEMENS Li3710 running Vista the Ubuntu 9.04 distro.. im a complete Linux noob, but i wanted to give it a second try) so i downloaded it and burned it on the fast laptop, so there wont be any errors caused by low memory during burning I installed and then i went to the Ubuntu desktop - i had all drivers installed. Everything but Amarok sound worked, i turned off my laptop and went doing my job.. The next time i started up my laptop and went on the desktop .. a tradition is to browse the web, so i did that and i couldnt load a single page, except pages with direct IPs i had Skype working just fine and i had a friend there running SuSe and asked him for help. We identified it as a DNS problem, but because of my noobness i couldnt deal with it and i HAD TO switch back to windows, wich i regret so much.
I know that im a noob, but if i have an internet running at its best i can look at forums and resolve my other issues, so im asking for a screenshots on DNS settings so i can fix it the next time i install Ubuntu.Also! I was using cable via PPPoE (and the only terminal command i know is "sudo pppoeconf" ), now im with router, connecting my laptop directly via WI-FI, will i have the same problem and will i have to make settings so i can connect to my router? Because back then i tried to connect to wireless networks and the ones i could connect on XP/Vista/7 i simply couldnt connect on Ubuntu...I really want some real PC knowledge and to use Linux
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Jun 1, 2010
I want to ssh to a pc in our home network. It is a standard network in terms of a DSL router, dynamic IPs via DHCP, WPA2/PSK security, wireless network connection for all pcs except one which is wired to the router.I got the error "no route to host" from ssh. Openssh-server was already installed. It turned out later that the laptop I want to ssh to (namely the one which is connected by cable) cannot be pinged by any other laptop on the network.
The pc in question (lucid lynx with most recent updates) is online, can ping itself and the router, but cannot ping others in the network and cannot be pinged by them. I suspect a firewall setting of being the problem.
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Jul 24, 2010
I have searched for this quite a bit but my lack of knowledge of IPTables makes me doubt whether I have found a solution or not. I have very light experience with IPTables as well.So I thought I'd ask here.Basically, what I am trying to do is use an external transparent proxy for only one of the hosts on my internal network. For example, for an internal host of 192.168.1.8, I want to send all internet requests for ANY port to a proxy server out in the internet at 238.34.232.7 / port: 8080. All other hosts would use the internet without using any proxy server.
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Mar 4, 2011
I am trying to make a file proxy server...that is any request of file a client makes goes to the proxy server...it checks it in cache if not there then asks main server for the file. to act as a server for client and as client for server...how to do it in a single program. I tried with 2sockets with different ports one for client-proxy server and one for proxyserver-main server.But it does not workAm i doing something wrong or is there any other method
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Jan 20, 2010
I have a linux box, which was given to me by a company with 3 dedicated IP addresses. My goal was to setup ssh tunnels on all three dedicated IP Addresses.
Via Putty, i am successfully able to create a tunnel to the box's on IP1 IP2 and IP3 - that is i can make incoming connections on all three IP's.
However, my problem lies when i attempt to USE the tunnel. AIn all instances, regardless of the IP i actually tunneled into the box with, it returns IP1 as an outgoing connection, i.e if i setup IE to use the tunnel, it will return my IP as IP1, even though i have created the tunenl via IP2/IP3.
What id liek to accomplish is that when i create a tunnel via IP1, then outgoing connections go via IP1, and when i create a tunnel via IP2, then outgoping connectiosn go via Ip2 etc.
After discussing this with a colleague of mine, he infomed me he had the same problem at one point, and that some configuration on the box was required - however he was unable to recall.
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Jan 24, 2011
configuring single signon using ldap
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Feb 9, 2011
I'm currently setting up a squid proxy which will be installed on a debian system configured as a bridge eth0/eth1 as br0. The problem I'm having is that port 80 requests are being proxied both ways where I only want the requests coming in via eth1 to be proxied.
Is there a way to do this? I've already tried changing the "-i br0" in the iptables redirection to "-i eth1" but no data appears to go through it.
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Feb 19, 2010
I am running several servers with multiple LAN ports. Two of the machines can communicate via two separate subnets to control bandwidth issues.
Machine 1: 10.0.0.1 (w/ additional alias 12.0.0.1)
192.168.1.1
Machine 2: 10.0.0.2
192.168.1.2
I see three separate intermittent symptoms on the 10.0.0.0 network.
1) Both machines will cut off in the middle of the data transfer (rsync) if it takes too long.
2) Both machines will claim that the RSA key host has changed on the other...this will happen every few minutes.
3) Both machines will, at times, disallow login from the other...ssh prompts for password but will not accept the password.
Performing any operation between the same machines via the 192.168.1.0 subnet has no issue (as of yet).From what I can see, the routing tables are set correctly. Machines were exact clones of each other. Machine 2 is a recently rebuilt machine with a fresh suse11 distro install. Symptoms on Machine 2 appeared immediately. I had this exact setup but reversed ip addresses before Machine 2 burned out without issue. All networks but the 12.0.0.1 are internal and there hasn't been any indication of attack.At times, running ssh-keygen -R <ipaddress> will fix issues 1-3, other times only 1-2.
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Jun 23, 2010
I have a single CentOS server with two separate NIC's. I was asked to install an internal Wiki on Apache but have that dedicated to one NIC so it's internal only. Then have just a site running on Apache on the 2nd NIC which is externally accessible. I have never done anything like this and would like tonow how difficult this would be on a single stand alone server that I have above?
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Jul 28, 2010
I have just taken on a dedicated server sitting somewhere in Norfolk. I have created a website that uses PHP to connect to another remote server in order to interrogate a MSSQL database. This script, running on Apache, uses a VPN connection to connect to the remote server.To test, I have Apache on my laptop at home and just used Microsoft Network Connection to create the VPN connection.I have now uploaded this site to my new CentOS server and need to create the same VPN connection. I understand this is a command level and have been advised to use OpenVPN which I have successfully installed.My problem is I only have the details remote ip address, username and password. I believe I have to use the 'client.conf' script instead of server.conf.
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Feb 22, 2010
My question is probably very common, but I didn't find an answer.I have several computers, each with different user. Each user has a shared folder in samba. I want all users to access all these shares with a single login/password (not with the login/passw of each particular user)
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Mar 15, 2011
how i can use VLANs. as i have red on the web, it is possible to have a switch to allocate ports to a single VLAN. thus splitting subnets on a port allocation. since i have a pc running KVM, it is possible to create multiple subnets for DMZ and LAN. thus my question is - is it possible to have a SINGLE cable connection to a switch that carries TWO subnets? so that i can decide how to distribute then on the pc?
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Oct 19, 2009
I'm having a problem that seems to plague a lot of people judging from my research on the web. I have a hosting provider that limits the number of incoming connections to the shared host to 50 per IP.
I have a single IP for outbound connections and I use Squid as a proxy server.
Lately I've tripped across the 50 connection limit frequently - and that's with only 1 user. It seems the problem is related to the performance you can get out of a desktop these days. Its not impossible to have several browsers open with several connections to different sites on the same server - and boom - locked out!
So it occurred to me that there must be some way to limit the number of outbound connections in the kernel - but I've not found it. I did find that Microsoft had been limiting the number of outbound connections in XP to 10 to address the virus problem, and I've found countless hosting complaints and dialog on the subject with no easy solution.
So my question is simply, does anyone know how to limit the number of OUTBOUND connections to a single IP in the kernel?
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