CentOS 5 Networking :: Dual Nics - Accessing Machines On WAN / LAN

Feb 23, 2010

My setup is as follows:
eth0 - lan ip
eth1 - WAN ip

I have installed a sip server on the box. From the box I would like to access machines on wan and lan. First of all, is it possible? If yes, I have setup up the nics with default wan gateway. However, when I try to ping wan url, no response. Are there other things I need to do to accomplish this?

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Fedora Networking :: Dual NICs And Internet Connectivity On F10

Apr 23, 2009

I've just installed Fedora 10 to basically work as a NAS for another machine - but also serve a couple of web pages. After having alot of issues with network manager (with it changing the subnet so nothing would work), I'm now almost there:

I have two network cards connected in the server:
1) eth0 connects to a switch that ultimately connects it to the net (on a 10.0.0.* network)
2) eth1 connects directly into another server for backups (192.168.0.* network).

Now when I setup eth0, I get network access can ping/ update/ surf the net - absolutely no problems, but when I connect eth1 in - the net dies and nothing works, I can ping devices on both the 10.0.* and 192.168.* networks, just nothing past the gateway. I presume this is either a route or DNS issue, but am unsure about where its falling foul - both the resolv.conf file looks fine as do the ifcfg-ethx scripts.

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Server :: Channel Bonding On NICs From 2 Different Machines With RHEL5.5?

Aug 3, 2010

I am currently investigating channel bonding for rhel5.5.Is there any way I can create one bond from nics on two different linux machines.They will be a cluster without any clustering software like beowulf or LVS.There will be a cluster interconnect through which they can communicate.Should I tweak the bonding module??

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Debian Installation :: Get Preseed Working On A Bunch Of Machines With Multiple NICs?

Mar 15, 2011

I am trying to get preseed working on a bunch of machines with multiple NICs but it doesn't pick the right interface and/or gets "no link" on all interfaces. My PXE kernel line looks like so (I have auto=true priority=critical and interface=auto)

label squeeze
kernel debian-installer/squeeze/i386/linux
append vga=788 initrd=debian-installer/squeeze/i386/initrd.gz auto=true priority=critical ramdisk_size=10800 root=/dev/rd/0 rw url=example.com/d-i/squeeze/preseed.cfg interface=auto netcfg/dhcp_timeout=60


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CentOS 5 Networking :: Multiple NICs On The Same Subnet?

Mar 30, 2009

I have a motherboard which has 4 x 1Gbps Ethernet controllers. I would like to use it as a Gateway for my home network. I have a static IP from my ISP which I can use to configure eth0 (I haven't done it yet as the LE-565 is currently sitting behind my Netgear router until I've got DHCP working). I would like to use eth1, eth2 and eth3 for my LAN. How do I set things up so that DHCP is handing out IP addresses on the same subnet ( on all three interfaces?

P.S. I think what I'm asking is: how do I combine all 3 interfaces to behave like a switch (ie. just like my Netgear router)?

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CentOS 5 Networking :: 2 NICs Only One Works - Eth0 Don't Work

Jan 18, 2010

I have a Proliant DL 120 G5 with CentOS 5.4 and I have installed a Brodcom Corporation Netxtrem BCM 5722 Gigabit Ethernet PCI. So I have two interfaces: eth0 broadcom eth1 Intel The eth1 works, instead eth0 don't work. I can ping itself and but I can't ping the gateway. The results of netstat -nr is:


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CentOS 5 Networking :: Configuring DHCP Server With Two NICs?

Mar 31, 2011

configuring DHCP server with two NICs. I need DHCP server with 2 NICs:

eth1 -
eth2 -

The client also has two NICs and suppose to receive ip addresses eth1 from and eth2 from Here is the dhcpd.conf from dhcp server:

ddns-update-style interim;
ignore client-updates;


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CentOS 5 Networking :: Multiple NICS In Same Machine Connected To The Same Switch?

Dec 8, 2009

I have a program that attaches to an interface. I can run two copies of the program on two systems (each running one instance), connect it to a switch, say & In this configuration two instances of the program can communicate and everything is fine.

Now, to reduce cost, it want to use only one system with two nics connected to the same switch, running two instances of the above program, each instance attached to two interfaces respectively on the system. I have the following settings:

eth1 Link encap:Ethernet HWaddr XXXXXXXXXXXXXXX
inet addr: Bcast: Mask:
eth2 Link encap:Ethernet HWaddr XXXXXXXXXXXXXXX
inet addr: Bcast: Mask:


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CentOS 5 Networking :: Routing 2 Internal Nets Through Separate NICs To Internet?

Nov 9, 2009

I have configured CentOS 5.4 as a router/firewall (iptables) as such, and it is working fine:

eth0 - Public IP/Intenet, DHCP
eth1 - internal "net1"
eth2 - internal "net2"

I want to add a fourth NIC, eth3, which will be assigned its own Public IP/Internet address (thru DHCP; my ISP provides two). The purpose it to route all net1's internet-bound traffic through eth0, and all of net2's internet traffic to eth3. This allows me to use one router/firewall machine instead of two separate ones. I anticipate that without some specific routing instructions, the default route will be eth0 for all net1 and net2 internet traffic (eth3 will be ignored).

I thought of using just one NIC (eth0) but create an alias (eth0:0), but IPtables (and possible DHCP) can't differentiate between the two (besides, nics are inexpensive). Is there a way to do this through routing commands, or even use iptables prerouting/forward functions (or is using iptables problematic)?

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Ubuntu Networking :: Accessing Files In Dual Boot( 10.04 And Mint)?

Nov 12, 2010

I have a dual boot ( Ubuntu 10.04 and Linux Mint), but I spend most of my time in the Ubuntu 10.04 partition. The point is that I have a huge files in the Mint compartment and I would like to gain access to those files from my Ubuntu 10.04 partition. I have tried samba and could not get the file sharing system to work. I had used samba when I was dual booting between Ubuntu and Windows and it worked but not in my present Linux dual boot.

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Ubuntu Networking :: Accessing Windows Vista - Dual Boot

Apr 3, 2011

Ubuntu and am dual booting it with Vista and I want to be able to access all my files from Vista whilst running Ubuntu. When I go on places, network, and click on windows network, I get a message saying 'Unable to mount location: failed to retrieve share list from server'.

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General :: Monitor The IP Address Of Machines Who Are Accessing The Server?

May 7, 2010

I have developed a website. Now i would like to monitor the IP address of machines who are accessing the server. The simplest possible solution to this that comes first into my mind is to use jsp inbuilt tags.

out.print( request.getRemoteAddr() );
out.print( request.getRemoteHost() );

but it has given me some other IP address(May be a proxy server's ip address)

So i was left with one choice is to run netstat on host server . Here is what i have done.

netstat -an | grep 8080 (As tomcat runs on port 8080).

Should i modify the command or there is any other way around to monitor the IP address?

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CentOS 5 Networking :: Accessing Windows PC From Centos

Jul 29, 2011

I have a small network with my Centos 5.6 box and a Win XP PC on it.I can access the files on the PC from the Centos box by bringing up the RUN window (ALT-F2 in Gnome) and typing smb://192.168.1.X/C (where X is the address of the PC), and I get a window with the C: drive from my PC. I can then drag/drop files between the Centos box and the PC. Here are my questions:

1) I want to script the file transfer, so how do I do this from the command line?

2) On the PC, I have 2 drives C, and E. They appear to be set up the same, but the E drive looks empty when I do this using the interactive method above.

I found this tutorial http:[url]..... but I can't get my PC "visible" in the smbtree.Really, I just want to write a script that does a backup on the Centos box and copies it to the E (External) Drive on the PC. (I'm a novice when it comes to administration)

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Networking :: Accessing CentOS On Win 7 Machine?

Dec 20, 2010

I can access my Win 7 machine from my CentOS machine, but not the other way around.

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CentOS 5 Networking :: Gathering Network Usage Of Xen / Virtual Machines?

Jun 23, 2009

I've run into a problem gathering usage for my xen virtual systems. With my old model I used to gather all network usage via my cisco devices using the the counters for each port. Each system had it's own port on the switch, and I tracked network usage accordingly. Now that I'm using xen for virtual systems, and multiple vm's share the same switch port, i'm not exactly sure what my best option is for tracking usage.

I thought I may be able to setup vlans on the switch, and bind each vm to a different vlan using vconfig... but it seems like there has to be a better solution than that.

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CentOS 5 Networking :: Multiple Nics With Multiple Gateway ?

Jun 16, 2009

I have a CentOS 5.3 box with three network interfaces in it. Each interface is attached to a separate VLAN and I want traffic to stay on each network segment.What I can�t figure out is why I cannot get each interface to have its own gateway and everything gets sent through the default gateway.The basically takes my possible 3Gb total bandwidth and throws it down a single 1Gb pipe.Then on top of that, if I take down the interface (ifdown) that has the current default gateway,I loose contact to the other two interfaces.When I look at the routes, each one of the interfaces shows the gw as and defers to the default route. So I delete the route and try to add a new route with:

[root@testsan ~]# ip route add via dev eth2

but end up with the error:

RTNETLINK answers: Network is unreachable

[root@testsan sysconfig]# cat network

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CentOS 5 :: Install 5.4 64-bit On A Server With Two NICs?

Dec 28, 2009

I am trying to install CentOS 5.4 64-bit on a server with two NICs, one of which allows for iSCSI boot. I want the NIC that allows for iSCSI boot to connect to the iSCSI target on my 169.254 subnet. I want the other NIC to be connected to my 192.168.1 subnet so that it can reach the Internet for the CentOS Network Install.

Anaconda only configures one NIC, leaving me with an iSCSI target and no Internet or with Internet and no iSCSI target. Is it possible to configure both NICs in Anaconda?

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CentOS 5 :: How To Set Default Gateways Of Both NICs

Jan 7, 2011

I have two NICs and both having different IPs and Default Gateways. Now CentOS by default picks only one default gateway and puts entry in routing table (route -n). I want to keep both default gateway in active mode to achieve redundancy. For example if traffic enters through eth0 then it goes out using default gateway of eth0 and if traffic enters from eth1 then it goes out using default gateway of eth1. I use command route add default gw netmask dev eth2 then both default gateways becomes active. Now I want to make sure that when server reboots both default gateways are setup. For this I wrote shell script/sbin/route add default gw netmask dev eth0/sbin/route add default gw netmask dev eth1I am calling this script via /etc/rc.local but it doesn't work on boot time however once server is booted and I execute script (sh script.sh) then it works fine.

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CentOS 5 Networking :: Use Webmin To Set Up Port Forwarding/NAT On A Dual-NIC Centos 5.3 Box?

Aug 31, 2009

Can anyone here point me to a walk-through or discussion of how to use Webmin to set up port forwarding/NAT on a dual-NIC Centos 5.3 box? The layout will be simple:

Internet --- NIC1 [CentOS Box] NIC2 --- Switch to other PCs

We have a BUNCH of exposed services that are on special ports -- for example, to connect to one machine, you go in with [IP_Address]:12000, and to connect to another, [IP_Address]:12002, etc., etc. We're currently using OpenSuse 10.3 on this box, and YaST makes this criminally easy (you give it the incoming port number and the destination IP/port numbers and it just works). But OpenSuse 10.3 is nearing EOL, we're buying a new machine, and I'd like to use CentOS on the new one.

I've read the sparse Webmin documentation in their Wiki, and it leads one to believe that you simply insert a "NAT" rule. But there's obviously something they're leaving out. I *am* opening the ports in the firewall. But when I log in to [IP_Address]:port, it just times out. The port forwarding never occurs. The test in this case is SSH, and I know that SSHD is working properly because I can log into that machine just fine from another PC on the same internal subnet.

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Hardware :: CentOS 5.2 Wont Recognize Nics From Supermicro Server?

Jun 14, 2011

I just installed CentOS 5.2 on a mini Atom server and it wont recognize the nics. Not sure what kind they are, think they are Intel. (built in)It's the first time this has happened to me. Where do I start to get it to recognize the nics? Normally it works out of the box.

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CentOS 5 Server :: Building VMWare Virtual Machines From CentOS Mail Servers?

Oct 12, 2010

I have a few mail servers, a mail log server and a web server running on Centos 5. Now I have a task: to avoid accidental crashes on the production servers while installing updates, my boss asked me to do clones (these clones will all be VMware virtual machines) of the servers (EXCLUDING the actual e-mails and log contents) and then to run those clones on VMWare Server. This way, first I will install and test updates on the clones and - if they will be running without crashes - I will apply the updates on the real production servers themselves.

I have already installed VMWare Server 2.0 I have a few questions: How do I build the virtual machines to exclude the actual mail files and mail logs? Can I use VMware Converter for this purpose, or do I have to use another program? How do I actually do this cloning? Is there a tutorial on how to do this?

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Ubuntu :: Accessing Partition While Dual-Booting?

Jun 10, 2011

So, I installed Ubuntu using Wubi.exe for Windows. Is there a way to access the files I have on Windows while I'm on Ubuntu? Basically, how can I access files on the other side of the partition?

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CentOS 5 Server :: Attach Windows Xp Machines To A CentOS DS?

Sep 22, 2011

I'm experimenting with CentOS DS and have a question.Is it possible to attach windows xp machines to a CentOS DS? If so, how?!I think I've skimmed most of the documentation out there. Did I miss something? Is this not what the DS was designed to do?

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Hardware :: Initially Booted The Box Using A Knoppix 5.0.1 CD, And The NICs Worked Fine. When Installed CentOS 5.4, No Joy?

Apr 4, 2010

I have a whitebox server with three network adapters, two gigabit adapters using the intel 82573V chips, and an intel pro/100 adapter based on the 82562 chip. These are embedded on an MSI motherboard. None are passing traffic.I initially booted the box using a Knoppix 5.0.1 CD, and the NICs worked fine. When I installed CentOS 5.4, no joy.Interestingly, Intel recommends the e1000e driver (which I am using), but the Knoppix CD used the e1000 driver. Anyway, I pulled an updated e1000e driver from elrepo,installed it, and verified that it was in use with 'ethtool --driver eth2', and the correct driver/version was displayed.

Symptoms are no traffic passes, rx/tx packet counts in ifconfig are both 0 (no errors, either). Routing table looks fine; three routes: one for 169.x.x.x, 172.16.x.x (my subnet), and one for, all destined for eth2, and all up. When I ping, and the local adapter address, I get good replies. As soon as I ping a remote host on my subnet, I get 'Destination host unreachable'. Now, at one point, I actually got it to work. I applied a small patch from Intel to change a value in the EEPROM, rebooted as instructed, and the adapter came up and passed traffic. I did a 'yum update' to update my packages, and shortly thereafter, everything stopped working again.

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General :: Virtual Machines And Dual Monitors With A Windows 7 Host And Guest?

Oct 4, 2010

I'm looking for virtual machine software that supports dual monitors on a Linux guest with a Windows 7 host.VirtualBox supports dual monitors only for Windows guests. VMware Player was extremely slow, so I gave up. I'm not sure it supports dual monitors, anyway. Can anyone recommend a product for what I want to do?

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CentOS 5 :: Accessing Windows Desktop And Drives From Centos And Vice Versa?

Oct 3, 2009

i find this is an issue which might be tiresome for everyone except for those experts. Esp. for the computers which are dual booting(both windows xp and centos installed in the same computer), that when we are in CentOS we need to switch onto windows immediately. and vice versa. i see this is possible only by shutting down the centos/windows and then restarting onto the other OS.

Can anyone tell me the the solution to work simultaneously both xp and centos without the need of shutting down and restarting There maybe or may not be the solution...but i find the pleasure to know if there is for example, remote desktop connection in windows xp, is there any solution, we can work on windows via centos or vice versa ( in the same machine),

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Ubuntu :: Accessing Windows Data In A Dual Boot Environment?

Aug 3, 2010

I have a laptop dual booted with windows vista and ubuntu.I downloaded certain movies and music files while using windows vista,which are there in my hard disk,My question is can i access these music and video files when i boot into ubuntu,and can i play them?

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Networking :: 2 NICs In One Box On 2 Different Networks

Jun 5, 2009

I have attached a diagram to show the layout, but basically I have a server that has 2 nics. I use NIC1 for the server and its services. Im using VirtualBox to run VMs and want to use NIC2 for the VMs exclusively and I want the VMs on a different network completely from the host.Ive tried setting up NIC2 on the other network but I end up with networking problems on network1. Also I cant figure out how to tell VirtualBox to bind to the host NIC2.

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Networking :: 2 Nics In Same Subnet?

Jan 8, 2010

I have 2 x PCs and a NAS. Both PCs have 2x NICS. PC connectivity to Internet is via an ADSL router. Current config: Thus far (by choice) I've used static IPs in the 192.168.168.x range for my internal network, connecting all PCs and NAS via a jumbo frame enabled gigabit switch. This has facilitated moving data between the PCs and the NAS at high-speed. As both PCs also required Internet access from time to time, both are also connected to the ADSL router using the 2nd NIC and using subnet 192.168.1.x. I'm sure some of you are shaking your heads by now, but it works well and has been entirely hassle free.

However, I've an app running on the NAS that I'm keen to get Internet connected also. As my existing network devices are not using DHCP I figured the simplest method would be to change my ADSL router configuration such that it is in the same 192.168.168.x subnet, change its DHCP server settings to serve IPs in the same subnet (but in a restricted range I know won't cause any conflicts with the static IPs) and problem solved. On changing the ADSL router confiruration with all machines already booted up and configured as described above, everything worked. All devices could see one another, and access the Internet. On later rebooting the system this no longer works

- Internet access is fine but PCs don't see one another or the NAS. If I disconnect the ADSL Router from the PCs then all devices see one another again.

- Does having 2x NICS on a single device each assigned unique IPs in the same subnet create an issue and can it be overcome? I'd like to overcome it because making one of my PCs the gateway forces me to have it on anytime another device needs access.

- If I'm forced to use Internet connection sharing with one PC on the network connected to the router, how do I best configure this?

- One of the things I need to retain is gigabit connectivity between the PCs and PCs and the NAS (currently achieved by 192.168.168.x subnet being linked via gigabit switch).

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Networking :: Bridged VPN With Two NICs

Jun 4, 2010

My brother has a Ubuntu server attached to a LAN with Windows PCs. I set up an openVPN tun service on the server, let's call this VPN1, so that I can connect remotely from my Ubuntu desktop. The server has one NIC and the LAN has a router that is the gateway to the internet.

My brother would like to remotely access his windows network when roaming with his Windows laptop.

Therefore, I would like to set up a second VPN service, this time tap, that is bridged with his LAN. Let's call this VPN2.

The LAN subnet is The internet gateway is

The NIC has a fixed IP set by the router of

How do I set up VPN2 so as not to trash VPN1? That is, if I bridge eth0 with tap0 how will that impact VPN1's tun0 that is using eth0? Do I need a separate NIC for the VPN2 bridge?

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