Fedora Networking :: Two Network Interfaces - Setup Default Gw Route?

Mar 26, 2009

So I have two network Interfaces

eth0 - NAT behind a router
eth1 - Public IP

When ever I restart the machine, both interfaces pull a IP, but the it randomly chooses eth0 or eth1 to have the gateway. I want the gateway to be eth0 always.


Is there some file or setting I can modify in Fedora10 that will always choose on eth0 as the default gateway?

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Fedora Networking :: Setup The Network Scripts To Create Two Network Interfaces For Vlan X And Y?

Apr 7, 2009

Using Fedora 10, can anyone tell me how to setup the network scripts to create two network interfaces for vlan x and y. Both interfaces should obtain an ip from dhcp and both interfaces should run over eth0.

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Red Hat :: Networking - Setup Network Scripts To Create Two Network Interfaces For Vlan X And Y

Apr 7, 2009

Can anyone tell me how to setup the network scripts to create two network interfaces for vlan x and y. Both interfaces should obtain an ip from dhcp and both interfaces should run over eth0.

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Networking :: Xen Network-route And Network-bridge Setup?

Aug 22, 2010

I've currently got a Xen box with 3 Virtual machines on it, in a routed setup. I'd like to put them all on a private internal network as well, which I'm assuming I'd do with a dummy network card and a xen bridge, but I can't find any information about setting up the xen Bridging setup on top of the existing network-route instlal.

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General :: Route Different Applications Through Different Network Interfaces?

Jan 13, 2011

Is it possible to route different applications through different network interfaces?

Let's say (hypothetically) I want to route /usr/bin/thunderbird through vlan0 but /usr/bin/firefox through eth0.

Is there a way? And if so, is there a graphical tool for it as well?

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CentOS 5 Networking :: Which File Can Setup Up Network Interfaces

Jul 20, 2009

which file can setup up my network interfaces? i was able to setup the nameserver using /etc/resolv.conf but I cannot find anywhere to configure the ip and and gateway. I could't find /etc/network/interfaces as you do on Debian

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Ubuntu Networking :: Network Manager Replaces Default Route When Eth Cable Plugged

May 5, 2010

I have been encountering this problem, not only on 10.4, but on older versions too: I use a wifi router to connect my laptop to the Internet, but sometimes I need to connect directly to another computer to move some files over GLAN. But Ubuntu's Network manager doesn't allow me to configure the eth0 interface without specifying a gateway (no gateway = grey submit button), but when a gateway is specified, it always rewrites the default gw specified already by the active wifi connection and returns back after unplugging the eth cable.

Of course this can be solved by a few route commands, but this is unacceptable since it is needed to establish the cable connection without any further assistance from within and as well without replacing the default gw and thus breaking the Internet connection. Is there, please, any possibility how to prevent Network Manager from replacing these routes?

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Ubuntu Networking :: Messed Up /etc/network/interfaces - Original Auto Eth0 Setup Is Missing

May 24, 2010

I'm trying to setup my interfaces along side GNS3 for study purposes, and came across a ..... vid saying to try this (my current config)


I'm praying for some crappy syntax error, also in Network Connections... its now blank, the original auto eth0 setup is missing

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OpenSUSE Network :: 11.2 Xen Bridged Networking - Setup Multiple DomU Through The Default Bridge Setup

Feb 4, 2010

Im trying to setup multiple domU through the default bridge setup. I am able to access only one of them through the network at a time. If you ping one of the domU it works perfectly but you cannot ping any of the others until you stop pinging the one and even then it takes a bit before you can. Ive looked around for a while and seen similar problems but nothing ever seems quite the same. Im probably missing something really stupid. Or is this the way the bridge is supposed to behave? Do i need to use a routed virtual network?


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Fedora Networking :: Prevent Second I/f From Taking Over Default Route?

Jul 6, 2009

I have the following network/server configuration:


How do I prevent eth1 from being able to overwrite the default gateway that eth0 has already set?!? I read that one can create route-* files in the /etc/sysconfig/network-scripts/ directory to setup static default routes.But those seems to require one to know the IP address of the gateway, but in my case the ISP's gateway is served via DHCP and so it could vary from day to day. Here are the contents of some of the relevant files:


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OpenSUSE Network :: Network Manager Default Connection Can Handle Virtual Interfaces?

Jun 7, 2011

I've not found how to configure more than one ip address with network manager.Nor with kde nor with plasmoid network manager.I need several virtual ip addresses for eth0 when the "default" of eth0 is connected i.e. "Connected to Auto eth0" should initialize the virtual interfaces.I have not found no even how to configure the ip address.I think this will be used from ifup config in yast or not?There I have the virtual interfaces but they are not taken from network manager.And last but no least: Is it possible that when using network manager the eth0 is enabled even no user has logged in?

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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

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


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

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Networking :: Setup A Bridge Using Bridge-utils Within /etc/network/interfaces?

Dec 8, 2008

I want to set up a bridge using bridge-utils within /etc/network/interfaces like is shown here in this guide: [URL] The problem is that, at the same time, I want eth0 to have a specific static IP address. Right now I have a configuration for eth0. This guide tells me that I should not configure eth0 outside of the br0 configuration.

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OpenSUSE Network :: Verizon 3G - No Default Route Being Set?

Dec 5, 2009

I've been seeing a bunch of issues with the /etc/resolv.conf not picking up the nameservers for 3g connections, and managed to fix that issue using tips found here.. the one thing I m having a problwm with is my 3G USB modem not picking up a default route/gateway. I can connect using KNetworkManager, get an IP and nameservers, but.


And to top it all off, I cannot figure out what the default gateway should be from verizon to just write a script out myself that'll do it automatically.

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OpenSUSE Network :: How To Avoid Typing Route Add Default GW

Jan 14, 2010

I have a static ip on my wired (eth0) connection. I thought I had it well set up in yast. In the routing section I do have my default gw coming up there, with the the right nw i/f (eth0) associate with it. However, when I boot up, y config seems to ignore that fact, and I have to keep goign to root and typing "route add default gw <mygwip>" each time, which is something I want to avoid. Isn't it odd that the route settings created by yast have no effect? If they did, the route would be set up on bootup and I would haven't to do that typing.

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OpenSUSE Network :: NetworkManager Deletes Default Route

Jul 11, 2010

I'm currently struggling with the following problem: Connecting to a wired network with NetworkManager (0.7.1) is no problem at all: Everything is set up automatically, including the default route:


When I now add the route manually it works. But as soon as the cable is plugged in, the NetworkManager overwrites the routing table entry again (which makes it quite annoying). Does anyone know a way to avoid this behaviour?

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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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Fedora Networking :: Change Network Interfaces Names?

Dec 11, 2009

I found problem in FC 12 release. I installed fc 12 to server (earlier there was FC 7). Then as always i realised that names of interfaces (eth0, eth1, eth2 .... eth9) changed after install. eth0 became eth9, eth1 became eth5 ... Earlier on previous fedora releases i solved this problem correcting HWADDR in ifcfg-eth files, so i linked MAC addresses to names (eth0, eth1, eth2) as i wanted in a right order. Now I can't do this. After correcting these files and restarting network sevice i constantly get a message: device ... has different mac than expected. I looked ifup-eth file and compare it with the same one in fedora 7. And i found that in fedora 7 there is function rename_device which processes if HWADDR value doen't coincide with real mac address value. See code:

# remap, if the device is bound with a MAC address and not the right device num
# bail out, if the MAC does not fit
if [ -n "${HWADDR}" ]; then
if [ "${FOUNDMACADDR}" != "${HWADDR}" ]; then
curdev=`get_device_by_hwaddr ${HWADDR}`
if [ -n "$curdev" ]; then
rename_device "${REALDEVICE}" "${HWADDR}" "${curdev}" || {
echo $"Device ${DEVICE} has different MAC address than expected, ignoring."

But in fc 12 release there is no function rename_device!!!!!!!!! So in this case if HWADDR value is not the same as FOUNDMACADDR value (which equal to REALDEVICE mac address) i just get an error message So I can't change interfaces names, as result i can't organize right order of network interfaces as it was earlier on fc7.

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OpenSUSE Network :: Prevent Dhcp Client From Setting Default Route

Aug 18, 2010

In 11.3, if in "/etc/sysconfig/network/ifcfg-eth0" i set DHCLIENT_SET_DEFAULT_ROUTE="no" this seems to have no effect. If i start my box, the routing table has the "default route"-entry offered by a remote DHCP-Server. More Info: My Susebox has eth0 and eth1 and both network devices should use DHCP4. But from DHCP-offer on eth0 i want to use

* "offered IP-Adress for eth0"
* "offered NTP-Server"
* "offered Host-Name"

From DHCP-offer on the eth1 i want to use

* "offered IP-Adress for eth1"
* "offered DNS-Servers"
* "offered Default Route"

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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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Fedora Networking :: F11 - Service Network Restart Does Not Bring Up All Interfaces

Jun 23, 2009

If I restart the network service, not all interfaces come back up. Is this expected behaviour or does something need a kick?

[root@@aspire3500 ~]$ service network restart
Shutting down interface eth0: [ OK ]
Shutting down interface wlan0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
[root@@aspire3500 ~]$

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Debian Configuration :: Complex Network Setup - RPI To Automatically Route Internet

Jan 26, 2016

I would like to update my network setup.

Today, I have an ADSL box which is my gateway to internet (

I have a Raspberry pi (RPI) which I use as a dhcp & dns server (

Recently my mobile phone operator installed a 4G antenna beside my home, and the bandwidth and latency are much better with my mobile phone than with my internet provider (ADSL).

I would like to install a wifi dongle on my RPI (I would get wlan0 & eth0 interfaces)

When RPI detect my shared phone connection (tethering) I would like RPI to automatically route internet:

- from authorized devices on my network to my mobile connexion (wlan0 -> mobile phone).
- from other devices to the standard ADSL internet (eth0 -> ADSL box).

I don't want any device to use the shared 4G connexion, best would be authorized devices to be selected by MAC address. How I should properly setup such a network ?

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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:

/sbin/ifconfig eth0 netmask broadcast
/sbin/ifconfig eth1 netmask broadcast
/sbin/ifconfig eth2 netmask broadcast

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Red Hat / Fedora :: How To Add Default Route

Feb 1, 2010

I'm trying to move away from using /etc/rc.local for adding routes I've added


to /etc/sysconfig/network/network-scripts/route-eth0 after doing 'service network restart' I'm do see the new route as described by directive above. However, I still do not see the default gateway that's supposed to be on my box. Where/how do I define the default gateway using the route-ethX method above?

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Networking :: Cannot Seem To Setup Gateway To Route Properly

Jul 24, 2011

I have setup a second machine with slackware 13.37, it is a "supermicro" which I picked up though my work. the idea was to set it up as a gateway and gradually expand my knowledge of sub networking, iptables, forwarding and the like. after a couple nights of forum searching and "o'reilly" book reading I am still unable to get a proper route working thru the "supermicro" to our dsl router.

What is setup?: I will start from my main machine simply calling it slackbox
slackbox: has two ethernet cards which i have given static ip's to
eth0 and eth1
eth0 ( is connected to a switch and then to our dsl router, it is working, I am using right now to work on this forum.
eth1 ( is connected to the "supermicro" thru a cross-over cable, it also is working, pinging the "supermicro" works.
default gateway on slackbox is set to be (the supermicro)

I only set slackbox's default as when testing to see if the supermicro gateway will work
supermicro: also has two ethernet cards which i have given static ip's to
eth0 (this is the card with the cross-over cable connected)
pinging (the slackbox) works.
eth1 is connected to our switch as well, it is working, pinging our dsl router works.
default gateway on supermicro is set in rc.inet.conf to be (which is our dsl router)

All my machines have two ethernet cards. This has just made it easy for me to test the setup while still having internet access on slackbox. Yet when testing the gateway from slackbox thru supermicro I am getting "Destination Host Unreachable".

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Ubuntu Networking :: Default Route Stops Working?

Mar 22, 2011

I'm currently working with Ubuntu 10.10.I wanted to add a default route to a gateway named ppp0.I did it with the command> route add default ppp0It works ok. But then from time to time it suddenly stops and I have to go back again to the server and retype the command. I'm clueless as to why is it happening. I can assure no one is working at the server or doing anything over there.Does anyone know causes that might be triggering route default to stop working?Btw where is the best place to add this command so it will be executed automatically on start-up and without needing to login to the server?

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Networking :: Host A Service On Eth0 While Default Route Is A VPN?

Aug 21, 2010

I am attempting to run apache on my linux router while connected to a VPN. My default route is set to the VPN endpoint and I cannot control port forwarding at that end. I cannot seem to connect to any service that i bind to the eth0 interface. I believe that my iptables rules and OpenVPN are the source of the problem.

/sbin/iptables -t nat -A POSTROUTING -o tun1 -j MASQUERADE
/sbin/iptables -A FORWARD -i tun1 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables -A FORWARD -i eth1 -o tun1 -j ACCEPT

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Networking :: Iproute2 Load Balancing Without Default Route?

Jan 12, 2011

I'm trying to set up load balancing using iproute2 following this guide. I've got 4 dsl links as follows:

eth1 -
eth2 -
eth3 -
eth0 - (main uncapped line)

eth0 is the default route, and eth3 is being used for something else. So what I want to do is load balance browsing between eth1 and eth2. I've added all of the routes in the LARTC guide, but the command to enable the load balancing:


ip route add default scope global nexthop via $P1 dev $IF1 weight 1 nexthop via $P2 dev $IF2 weight 1 obviously involves creating a new default route. Since I'll be using Squid to push the traffic through the relevant line, how can I set up a load-balanced link for eth1 and eth2 without changing the existing default route on the server?

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Ubuntu Networking :: Default Routes For Specific Interfaces?

Oct 15, 2010

I've got a 10.04 machine with two ethernet interfaces. I have two separate outside internet connections. This machine is connected to both interfaces. But it DOES NOT route between them. It's just a host on both subnets. Again, no routing is to go through this host. I'd like to force traffic originating on each ethernet port out to that network's internet connection.

Here's the desired setup:
eth0 gw
eth1 gw

I'd like traffic on the address to go out through the gateway. I have a program bound to that address and need it's traffic to go out ONLY through the gateway. Any other traffic on the machine should go out the gateway.

The logic is: source IP is, dest IP is any then go out only through source IP is, dest IP is any then go out through first or next. The point is source on the .1.37 address must always go out the .1.1 gateway and NEVER through .12.1. Whereas traffic on the .12.37 address should try going out the .12.1 gateway first but can go out the .1.1 gateway if the .12.1 connection is down. I could live with this failover option. I could accept that traffic on the .12.37 address was likewise limited to its own gateway.

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Networking :: Setup Multi-Path Route Iptables ?

Jun 14, 2010

Here's my scenario:

I want it so any inbound traffic from dsl goes back out the dsl and same for rogers. I've been searching and playing with many docs with no luck.

Anyone know how I do this? The multiple routes are on the same device br0. (which I think is causing all my havoc)

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