Ubuntu Networking :: Multiple Interfaces - Connect Server From Computer

Mar 6, 2011

I have a built-in gigabit Ethernet card which is connected to a router. Router's IP address is 192.168.2.1 My IP is 192.168.2.161 (eth0) I also have a Nokia N900 connected via USB and its IP is 192.168.1.1. It serves as a second router and on that interface (usb0) my IP is 192.168.1.2 N900 is also connected to a wireless network. Router of that network has the IP 10.0.0.1 and N900's IP is 10.0.0.50 (wlan0) My problem is that I want to reach a server at 10.0.0.7 from my computer. Is there a way I can do that?

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General :: Use 'iw' To Create Multiple Virtual Interfaces To Connect To Multiple Networks?

Oct 26, 2010

I'm trying to connect one computer to two others in an ad-hoc infrastructure.

[computer 1] ---- [computer 2] ---- [computer 3]

computer 2 is running Linux and has a single NIC wlan0. I want to it to connect to both computer 1 and computer 3 so each computer can talk to the other. No switch is available so it needs to be an ad-hoc setup.

[Code]...

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Networking :: Setting Up DHCP Server With Multiple Network Interfaces

Jun 10, 2008

I am trying to set up a gateway/router/firewall box for a small business. The requirements for the job are that the box must serve up internet to the business and also to the apartment downstairs and I am having trouble configuring the DHCP server on the gateway. The gateway has three Network Interface Cards:
eth0: which connects to the modem and the rest of the internet
eth1: which goes downstairs, to serve the apartment
eth2: which serves the small businessThe DHCP server should assign all dynamic ip addresses to the downstairs network (eth1), in the range 192.168.0.0 - 192.168.0.255

The upstairs (business) should assign static ip addresses to the servers on the network and dynamically assign ip addresses to any other computers asking for a DHCP lease on the eht2 interface. The addresses assigned to this network should be in the range of 10.0.0.0 - 10.0.0.255. My problem is that computers connected to the 'eth1' interface do not receive an ip address. After connecting a computer to the eth1 interface the computer requests an ip address, but none comes. I am quite sure this is not a hardware fault, I have tested the system first with a crossover cable and a computer directly connected to the router interface and also with both computers connected to a switch using patch cables.

The contents of my /etc/dhcp3/dhcpd.conf file are as follows:
[Global Options]....
subnet 10.0.0.0 subnet 255.255.255.0 {interface eth2;
option routers 10.0.0.254;
option subnet-mask 255.255.255.0;
option domain-name-servers 10.0.0.254; }

subnet 192.168.0.0 subnet 255.255.255.0 {interface eth1;
option routers 192.168.0.254;
option subnet-mask 255.255.255.0;
option domain-name-servers 192.168.0.1;}

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Networking :: Getting A Firewall With Multiple Interfaces?

Mar 11, 2010

I would like a basic firewall on my netbook and first attempted this by using firestarter as i have no experience in writing IPTABLES rules from first principle and to be honest the syntax looks horrific! the problem with firestarted is that when i selected WLAN0 to be the internet connected port everything worked fine until i connected to a VPN at which nothing would work (the only error i got was when pinging an IP address when i got sendmsg not permitted) my normal setup is this.... normally im connected via WLAN0 to the internet. but one one particular network i must activate the VPN to use anything, this creates another interface tun0. both wlan0 and tun0 will be assigned an ip address but only the tun0 will do anything (the wlan0 one is configured by the network to just allow traffic to the vpn gateway and nothing else) what i really need is some way of creating a basic firewall (drop all incomming except ports i specify) that lives on wlan0 unless tun0 is active in which case it moves to tun0

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Networking :: Using Multiple Interfaces For Tcpdump?

Feb 16, 2011

Is there a way to do multiple interfaces in tcpdump? I have found that when using "-i any", not all packets are captured (compared to "-i eth0" on a machine with only one interface). I need to monitor traffic on some machines with as many as 6 interfaces, and get these packets that "-i any" misses. When I give the "-i" option multiple times, it seems to only use the last one.

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Ubuntu Networking :: Getting Dynamic Ip Addresses For Multiple Interfaces?

May 6, 2010

I have 4 Ethernet Interfaces. I need Dynamic IP-Addresses for 2 Interfaces. Can anybody help me how can i achieve that

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Ubuntu Networking :: Multiple Interfaces In Network Manager Have The Same Name

Apr 7, 2011

I have a problem where multiple interfaces in my network manager have the same name. This means that I am unable to have different settings for each interface. Here is my setup:

Ubuntu 10.04 LTS
uname -a: Linux muon 2.6.32-30-generic #59-Ubuntu SMP Tue Mar 1 21:30:21 UTC 2011 i686 GNU/Linux
Adapter 1: 02:00.0 Ethernet controller: Intel Corporation 82573E Gigabit Ethernet Controller (Copper) (rev 03)

Adapter 2: HTC Desire tethered via USB. When I start from scratch, with no remembered networks in the network manager, the Ethernet is shown as "Auto Ethernet". When I then connect the HTC Desire, the new network is shown in the network manager also as "Auto Ethernet". Previously, when I right clicked on the network manager and selected "Edit Connections", there were multiple "Auto Ethernet" entries under the wired tab.

Now (and I do not know what changed, sorry), I only see one entry. When I edit this entry (say, add a route), then the route is added for both network interfaces. This used to still work, so I was not worried about the name clash, but now it is causing problems so I need to have a different name for each network interface.

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Networking :: Combining Multiple Interfaces With Multicast?

Apr 1, 2010

I have 4 interfaces, dvb0_0 - dvb0_3. Each one has a multicast stream coming in on it. The program I am using to decode these streams only accepts one interface though. How can I "combine" so that the program, listening on 1 ip can get all 4 streams? they are on groups 224.0.1.1-4

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Networking :: Splitting The Traffic On Multiple Interfaces?

Jul 6, 2010

I have the following setup: Client A, having 2 network interfaces, eth0 and eth1, both with the IP address 192.168.1.1/32. Client B, also having 2 network interfaces, eth0 and eth1, with the IP addresses 192.168.1.2. The routing table on client A has one entry: 192.168.1.2 dev eth0 The routing table on client B has one entry: 192.168.1.2 dev eth1. Basically the idea is to send the upload traffic one one interface and the download traffic on the other interface. (Client B could serve as a gateway). However, with this setup, well... nothing works. The packets received by Client B are ignored. Does the linux kernel have anything against routing packets coming from an interface, although he thinks the source is on another interface?

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Networking :: Receiving Multicast On Multiple Interfaces?

Jul 9, 2010

I am trying to run some benchmark tests for multicast. What I want to do is have one system send multicast packets and another receive it on all it's interfaces (eth0-eth3). Whenever I run receiver on more than one interface I get echo effect (if I receive on x interfaces then I get same packet x number of times). Is this how it is supposed to behave? It does not make any difference whether I use loop-back or not. I have set SO_REUSEADDR to yes. I run separate instance of receiver on each interface. I am doing this on RHEL5 systems.

# uname -r
2.6.18-164.20.1.el5

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Fedora Networking :: What Happens With Multiple Network Interfaces

Apr 30, 2009

What traffic goes where? Why? Any bandwidth advantage? What if one goes down?

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Networking :: Udev Failure With Multiple Interfaces

Jan 7, 2011

I have got a problem in the configuration of the network for my Linux box. The distribution is Slackware 12.2 with the 2.6.27.7-smp kernel. There are three ethernet NIC, one on the motherboard with Atheros AR8121/AR8113 chip and two on PCI card which with RealTek 8169.
I installed the module for Atheros which is the atl1e.ko and I defined the configuration for the three NICs in /etc/rc.d/rc.inet1.conf.
When I hit the commend ifconfig I see all the three interfaces eth0, eth1, and eth2, but the address are not distributed between the NICs as I'd like so I thought to resolve the inconvience with udev, but I don't know how to proceed because there is a strange situation.

If I control the file /etc/udev/rules.d/70-persistent-net.rules I see a strange situation: Once the file contains nonly a line for the Atheros NIC but if I reboot the system there are the two lines for the two RealTek NICs and everytime the system is rebooted there is a change between these two alternatives. A detail I noted is that the two modules atl1e and r8169 are both always loaded, so udev has always the chance to detect the hardware but for some reason that I don't know something goes wrong. Another related problem that bothers me is the absence of udevinfo and udevtest. Have I perhaps to reinstall udev?

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Ubuntu Networking :: Multiple Network Interfaces (one Connected At A Time)?

Oct 15, 2010

configure a server with two network interfaces? This system is physically moved from one network to another every few days (different buildings but connected by a VPN). I'd like to be able to control the IP address of the system depending on which port I plug the network cable into with a static setting. Right now the system will connect to the local network, but any requests to go beyond the subnet get lost. The only way I can get the system to talk outside of its subnet is to comment out the second interface.

/etc/network/interfaces:

auto lo
iface lo inet loopback
auto eth0

[code]....

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Networking :: Pinging Multiple Interfaces - Getting Pings From Eth0 But Not From Eth1?

Feb 26, 2011

I have two network interfaces and their entries are shown as eth0 and eth1... I want to assign them static IPs which I do by

ifconfig eth0 192.168.9.245 netmask 255.255.0.0 up
ifconfig eth1 192.168.8.245 netmask 255.255.0.0 up

But I am not sure if it will ping both the interfaces if I issue a command

ping -I eth0 192.168.9.113 (machine in network)
ping -I eth1 192.168.9.113 (machine in network)

I am getting pings from eth0 but not from eth1

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Fedora Networking :: Set Up Multiple Virt Interfaces In Network-scripts?

May 15, 2009

if I want to do eth1, eth1:0, eth1:1 etc and automatically configure them at startup where do I put that in the network-scripts?

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Networking :: IPtables Port Forwarding \ Have A Computer With Two Interfaces Eth0(LAN) And Eth1(WAN)?

Apr 20, 2011

I have a computer with two interfaces eth0(LAN) and eth1(WAN).I have followed some guides on the internet and came up with this iptables configuration:

# Generated by iptables-save v1.4.4 on Wed Apr 20 09:43:12 2011
*nat
:OUTPUT ACCEPT [0:0]

[code].....

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Ubuntu Servers :: Connect Multiple Computers Running & Run Software From One Computer From The Other?

Jan 15, 2011

This may sound stupid but I've got to ask. Can I connect multiple computers running Ubuntu & run software from one computer from the other? I know how to connect using SSH & to copy files back & forth but I don't know how or if I can share programs.

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Ubuntu Networking :: Connect To Wireless - Settings In The /etc/network/interfaces Are All Messed Up

Feb 17, 2010

the default for /etc/network/interfaces? I believe I screwed it it up because I can detect my wireless, it just won't allow me to connect to it. The settings in the /etc/network/interfaces are all messed up. I'm running Ubuntu 9.10.

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Ubuntu Networking :: ADVISEADDR: Error In Specifying Interfaces: No Existing Ip Interfaces Found

Jan 7, 2010

I have a weird issue that I have not seen on any forum. My jaunty on DELL studio laptop seems connected to net, but I can not access any network service (ssh, firefox etc.). But when I connect a cable the cable lights blink as it should be and in wireless connection my wifi light blinks.

It was working 2 days ago without problem, and I have not done big changes recently.I removed and reinstalled network-manager and network-manager-gnome. Nothing changed. I see a message in each restart as follows (when Openafs is starting). I can reproduce it with "/etc/init.d/openafs-client restart"

Code:

ADVISEADDR:error in specifying interfaces: no existing ip interfaces found

#lspci

Code:

04:00.0 Network controller: Intel Corporation Wireless WiFi Link 5100
08:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe (rev 10)
#lshw -c network

[code].....

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Ubuntu Networking :: Adding Interfaces To /etc/network/interfaces?

Apr 16, 2010

If I try to add a new interface (eth1) to /etc/network/interfaces, I get

Code:
* Reconfiguring network interfaces... SIOCSIFADDR: No such device
eth1: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device

[Code]...

How do I add 2 interfaces and get anyone of them to work, as available ?

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Fedora Networking :: Enable 3 Interfaces \ When Start One Interface The Another Interfaces Goes Down?

Jan 25, 2010

I have 3 Interfaces for a different LAN's and when I start one interface the another interfaces goes down.How can it's possible?I configure my ethernets as:

Code:
/sbin/ifconfig eth0 172.16.3.108 netmask 255.255.0.0 broadcast 172.0.255.255
/sbin/ifconfig eth1 172.16.3.109 netmask 255.255.0.0 broadcast 172.0.255.255
/sbin/ifconfig eth2 172.16.3.1110 netmask 255.255.0.0 broadcast 172.0.255.255

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General :: Multiple Interfaces To One IP Address?

May 30, 2010

At present, I have:

a Netgear router with DHCP off at 192.168.0.1 my computer

eth0 at 192.168.0.2
wlan0 at 192.168.0.2

The wlan0 interface always connects to the router, while the eth0 interface connects to other computers with crossover and acts as a dnsmasq DHCP server for network boot and installation.

If I use the Gnome NetworkManager to enable both connections, that is, with wlan0 connected to the router/internet and eth0 to another computer, both as 192.168.0.2, I cannot access the internet while eth0 is connected.

Why is this? How can I configure my computer to follow wlan0 for Internet usage, but use eth0 for itself (the latter is working but blocking wlan0).

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Debian Configuration :: Multiple Network Interfaces With VirtualBox?

Mar 29, 2010

I have a rather urgent problem with my network, I got two virtual network interfaces one internal and one external. The problem is; I can't get connection to internet. The external NIC is set as a NAT and the internal is... internal.

/etc/network/interfaces
auto eth1
iface eth1 inet static
address         192.168.1.200
netmask         255.255.255.0                             

Running with this configuration makes my internet connect go away, however if I remove the configuration for eth1 everything is working fine.

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Server :: Squid 3.1.12 To Connect To Multiple Domains?

May 18, 2011

I am using squid 3.1.12 as a proxy cache. All the requests initially land on a Apache server which acts as a reverse proxy server, the Apache redirects some URLs based on the context to Squid server. This Squid server based on the URL needs to forward the request to the specific tomcat server where the application is deployed. I am able to configure just for one application but how do I configure multiple tomcat servers(each tomcat having different application deployed on it). Squid needs to redirect based on the URL.In Squid.conf I made the following changes

[URL]

cache_peer abc.dev2.xxx.com parent 8080 0 no-query originserver refresh_pattern -i /ABC144020%1440 override-expire override-lastmod reload-into-ims ignore-reload
#cache_peer def.dev2.xxx.com parent 8080 0 no-query originserver

[code]....

Here Squid is deployed on my host [URL], Apache redirects any URLS with the context 'ABC' or 'DEF' to squid. Squid needs to redirect it to the individual hosts thats [URL] or [URL] based on the URL. I have commented the entry for DEF in my squid.conf as it was not working. But it does work for any URLs with ABC as the context.

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Ubuntu Networking :: Computer Cannot Connect To DNS

Jun 28, 2011

I am currently trying to upkeep and use my recently deceased fathers ubuntu machines, but as of 6 months ago I had never used Ubuntu or anything like it. I'm not trying to do all that much with it but a few days ago one of the machines lost its ability to connect to the internet, whereas every other machine in the house connects through the router just fine (wireless and ethernet.) I believe i've been able to diagnose part of the problem, the computer cannot connect to a DNS, but I have no idea as how to go about fixing it. My knowledge of Ubuntu is limited to just a few terminal commands. This computer is the one we use to network all of our printers and there are also some critical files on this machine that I need.

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General :: Custom TCP Parameters For Multiple Interfaces - Change The Default Values

Feb 16, 2011

My question is about TCP parameters in Linux. By now, I want to change the default values of:

Initial Timeout
ACK Delay
Idle Connection Timeout

I have a Linux Box with kernel 2.6.x and 2 ethernet interfaces. I know TCP is a stack that doesn't have anything to do with ethernet devices. Said that, the question: is there a way to set custom values for each interface? For example, a server listening to connections in eth0 would use one value for Idle Connection Timeout and another server listening to connections in eth1 could use a different value for that parameter.

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Ubuntu Networking :: Cannot Connect To Windows 7 Computer

Feb 6, 2010

I have Ubuntu 9.10 setup on a test box. I am able to connect to my Win XP box shares but I cannot connect to my Win 7 (64 bit) box I get the usual 'Unable to mount location'. I can get to the Win 7 share from my other Win box so it is a valid share. I also cannot connect via the Remote desktop viewer. I am afraid that if I cannot get this going my Ubuntu experiment i over before it started.

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Ubuntu Networking :: Computer Will Not Connect To Network

May 7, 2011

if I install dhcp ip on my computer, then my computer will not connect to the network, but if I set it up with static ip then my computer will connect to the network. but after 5 minutes later my computer will be mounted from the server dhcp ip. and my computer is not connected anymore to the network dropped out again.

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Ubuntu Networking :: Computer Don't Connect Automatically?

Apr 14, 2011

My hard drive crashed and I put in my old one. Re-installed Ubuntu and now my wireless don't connect. I have to choose my network, then enter my password to get it to work.

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Ubuntu Networking :: Computer Won't Connect To Network Until Log In?

Jan 19, 2011

My desktop doesn't seem to be connecting to the network until I login. This creates a problem if I'm trying to ssh in after a reboot. It's a wired connection. Any ideas?

edit: sorry my internet lagged and the thread got copied

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Networking :: Connect To Multiple Ssh Servers Behind Router ?

Jan 14, 2011

I have 5 linux ssh servers at my office that are behind a router. How do I connect to any one specific server from outside the LAN? Do I have to port forward the router giving each machine it's own port? That seems clunky.

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Ubuntu Networking :: Connect To An Individual Network Computer?

Mar 18, 2011

I have just installed Ubuntu 10.10 on my work computer. We have numerous machines on our Network, on Windows 7, I could never see the network machines listed but I could connect to individual machines simply by typing it's name in the address bar of the file explorer, such as://COMPUTER-NAMEWhen I connected my mac, I could access other computer's files using Apple + K smb://10.0.1.xxx

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Networking :: Can't Connect To One Web Site From A Computer / Fix It?

Feb 18, 2010

Here's a strange one. On my internal network, there are two WinBlows boxes, both connected to my Linux Router/Firewall. Yesterday, I needed to download a file from http://www.freebsd.org. The 1st machine I tried, would not connect from FireFox. When I tried, on the 2nd, it connected immediately. So, I did all the usual "stuff" on the 1st one. Re-booted, as it's WinBlows, cleared browser cache, etc. etc. It still wouldn't connect. BTW, connecting to other web sites was no issue. Just FreeBSD.

So, just for grins, I ran a traceroute from both machines, and here's where it gets freaky. Here's the traceroute from the working machine code...

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Networking :: Remotely Connect To A Computer Outside Of The LAN?

Jul 12, 2010

i have a computer at another house that i would like to controll from my house (both run ubuntu lucid lynx) how do i connect to the other computer using the viewer and remote server pre-installed in ubuntu

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Networking :: Remotely Connect Computer Over LAN?

Jan 15, 2011

I have my Linux box in my Lan environment. I want to connect my Linux computer remotely from my windows PC using command line . how can I connect it remotely over the Lan ?

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