Software :: Add Static Route For Loopback Interface?

Apr 9, 2009

I have configured LVS under RHEL5. I need to configure static route to my VIP. Now, I used the following command to add route but reboot OS will flush the route.

# route add -host dev lo:0

how to add static route for certain network via /etc/sysconfig/network-scripts/route-<device-name>. But I did not found that for host.

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Networking :: Route-eth - Adding A Static Route?

Apr 29, 2009

I would like to add a static route, however I do not understand what is meant by the Address setting below


Does this mean any addresses beginning with are routed over the gateway an address range

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Ubuntu Networking :: Loopback Interface Not On Startup?

Apr 20, 2010

I own an Ubuntu Server 9.04 on a remote dedicated server. Since a few days (?) the loopback interface is not 'up' on reboot : I only have eth0 (which works fine).Here is my /etc/networking/interfaces (did not change since server initialization):

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface


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Networking :: Will Bringing Down Loopback Interface Make Whole Server To Go Down?

Dec 14, 2010

I have a client's linux server where someone added a script which sends spam mails from the server's local loopback address ( all my seniors worked on it and couldn't trace the script on the server this issue was going for a week, now I have an idea to bring down the loopback interface of that particular server(ya, that was not a permanent solution but just had an idea), but my support manager told that it will bring the whole server down(so far as i have learn't loopback address is used only for testing the NIC card's functionality), is that really bring the server down.?. How ever i tried this using a test machine all the connections works fine even after i bring down the loopback interface. As my client's server is a production server i can't test it there without clear knowledge, can any one help me out whether will it bring down the server or will it cause any side effects on it(i know that you guys are experts so i am asking it here)?

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Fedora Networking :: Wired Connections - Shutting Down Loopback Interface

Jun 22, 2010

I have a problem with my F13 and wired connections on my Acer TravelMate 2410. When I connect the inet cable it doesn't show it as connected. When I type ifconfig, it shows everything as it should. When I tried to bring up eth0 with ifup eth0, it said that the device is not managed by NetworkManager. I tried to restart nm with service network restart, but it gave this error:

Shutting down loopback interface: Error org.freedesktop.NetworkManagerSettings.InvalidConn ection: ifcfg file ;/etc/sysconfig/network-scripts/ifcfg-lo' unknown

The same error came up for eth0 and Wired_connection_1 (the connection I configured from NM )
When I typed nmcli dev list it gave me:

GENERAL.TYPE: 802-11-wireless
GENERAL.STATE: disconnected

GENERAL.TYPE: 802-3-ethernet
GENERAL.STATE: unavailable

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Ubuntu Networking :: Network Tools Defaults To Loopback Interface

Jul 22, 2011

I'm running Ubuntu 11.04 and I've been unable to access any type of Internet service besides web browsing. When I check on Network Tools, it's always set on Loopback Interface, regardless of whether I've just switched it to Ethernet Interface. I haven't been able to download system updates through Update Manager. I'm not very experienced with Ubuntu.

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Red Hat :: Static Route Gets Ignored

Oct 19, 2010

On a Red Hat Enterprise Linux Server release 5.4 (Tikanga) system, I set up a static route that unfortunately seems to get ignored.I set up the static route in the file /etc/sysconfig/network-scripts/route-eth0 as follows: via

I've restarted the network service and also rebooted a few times. Here's my current routing table:


I am able to ping However, when I do traceroute, it appears that the traffic goes through the default gateway instead of our requested specific gateway


I can ping both and In the route-eth0 file, I�ve also tried using the alternate syntax with ADDRESS0=<IP address> etc, but it didn�t work any better. I also tried setting a more general route of via

The System / Administration / Network tool previously showed a spurious extra NIC called eth0.bak in addition to eth0. I deleted the eth0.bak and rebooted, but this also didn't help. Currently, eth0 is the only NIC on the system.

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Programming :: Interface "eth0" Which Is Down - Wasn't Displayed But Loopback Interface Has Been Displayed

Jan 6, 2011

The following are the output of command "ifconfig -a":


The interface "eth0", which is down, was not displayed, but loopback interface has been displayed. So, how can I make my application display all interfaces, including the interfaces which are down, but excluding the loopback interface?

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Ubuntu :: Can't Set Static Route?

Apr 21, 2010

Using Ubuntu 9.1, I get the error "SIOCADDRT: No such process" whenever I try to set a static route using

sudo route add -net dest netmask gw gateway


sudo ip route add dest/24 via gateway dev eth0

gives me "RTNETLINK answers: No such process".

From googling, it looks like others have had this problem, but I haven't found any working solutions yet. Anyone have any idea how to fix this?Ok, finally found the issue. The gateway has to be on the same subnet... ugh, is there anyway to use a gateway on a different subnet without tunnels? I can ping the machine I want to be the gateway, so I feel like I should be allowed to set it as a next hop for specific addresses.

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Ubuntu :: SSH Can't Find A Route To Host After Set Static IP

Apr 22, 2010

so on the host i'm trying to connect to, i have installed ssh server and it was working fine until i changed the /etc/network/interfaces file to set a static IP and then ran Code: sudo /etc/init.d/networking restart but now when i try to connect with SSH using the new static IP i get Code: ssh: connect to host port 22: No route to host

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General :: Adding A Route To A Static Host

Feb 12, 2010

I've trying to add a route to a host to force traffic out of a clustered IP address...

IE I have a cluster and the IP address moves from host to host on failure of a resource. The IP address is just a simple alias of an interface so for example... bond0:0 and bond0

What I want to do is force a program that starts up on the cluster hosts which sends packets out to a listening server to only send out of the cluster ip address.

I did a route add -host gw But this doesn't seem to work if i try to send a ping the packets still go out the wrong address, and more and above that for some reason the ping doesn't work at all. If i remove the route the ping will work again.

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Ubuntu Networking :: Persistent Static Route Dual NIC Firewall

Apr 3, 2010

I have a dual NIC firewall and everything works fine but only if I run the static route for the default gateway manually:route add -net netmask gw x.x.x.x dev eth1.Where eth1 is my WAN interface and x.x.x.x is my WAN IP. I've spent about 20 hours trying to figure out just how to get this static route to come up automatically upon reboot. I've read all the manuals and all that jazz.I've added the "up route..." or the "post-up route..." commands to the /etc/network/interfaces file but that does not work (although my other static routes work just fine from here). I've copied the relevant text and pasted it onto the command line to confirm correctness - everything with the command is fine.

I've also creates a static-routes file (and chmod +x, confirmed the correct permissions, etc) in /etc/network/interfaces/if-up.d/ and attempted to set the routes here (yes - using the "/sbin/route add -net." terms that work FINE from the command line). But that does not work either.

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Ubuntu Networking :: Static Route For A Nested Internal Network?

Jul 13, 2010

I'm using ubuntu server 10.04. I need to create a second network to do some testing. Here's what it looks like so far: WAN > x.x.x.x/9 > router > > LAN

I need to do this: WAN > x.x.x.x/9 > router > > LAN > ubuntu server (LAMP, dhcp, dns via eth1) [eth0] > ubuntu server [eth1] The two networks should be transparent to one another. I've got everything working, except routing. Here is ifconfig:


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SUSE :: How To Route 2 Interface

Oct 13, 2009

I have a suse with 2 eth interface both connected :

eth0 is configured with public ip Code: eth0 Link encap:Ethernet HWaddr 00:1E:0B:48:7E:D2
inet addr:87.*.*.* Bcast:87.*.*.* Mask: and eth1 with internal ip Code: eth1 Link encap:Ethernet HWaddr 00:1E:0B:48:7E:DA


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Networking :: Cable Modem Connection Fails - Static Route Disappears

Jan 24, 2011

Running Gentoo with kernel 2.6.29 on a Sparc Ultra 10. I'm having problems with my cable modem connection failing, so I've added a static route that enables me to log into the modem's diagnostics page at when the connection drops; my /etc/conf.d/net looks like this (with the comment lines removed).

config_eth1=(" netmask broadcast")
" via"
) dhcpcd_eth0="-N"

This works but after a period of several hours to several days, this static route disappears from the routing table.

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Networking :: Route Add With Specific Interface?

Apr 18, 2009

I have an Asterisk-server with 2 interfaces, a WAN-interface (eth1) and a LAN-interface (eth0).

SETUP : IAX-provider(internet) --> firewall --> Asterisk-server --> switch --> clients_on_LAN

So everything coming from the IAX-provider on port 4569 is forwarded to the Asterisk-server's WAN-interface (eth1). This needs then be routed to an internal SIP-phone (an IVR-system will define which one) via eth0. When a call is initiated from an internal SIP-phone (they register to the IP-address assigned to eth0) it needs to be routed via eth1 to the gateway ( Asterisk will setup an IAX-channel on WAN-interface (eth1) to the IAX-provider (via gateway). So... will this work :


route add -net ip_IAXprovider netmask gw dev eth1


route add -net netmask dev eth0 (no gateway needed for the LAN-interface, communications to the gateway need to go via the WAN-interface !)

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Networking :: Route For IP And Port Trough Specified Interface?

Aug 13, 2010

I have two NIC, one is ethernet and second is via modem. On the eth0, most of no standard ports are blocked, so I need to connect to specified port on some IP, through ppp0 (modem), to use ssh connection on non standard port to that IP. For other ports on that IP and all other IPs I want to use eth0.

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CentOS 5 Networking :: Route Add With Specific Interface?

Apr 19, 2009

I have an Asterisk-server with 2 interfaces, a WAN-interface (eth1) and a LAN-interface (eth0).


IAX-provider(internet) --> firewall --> Asterisk-server --> switch --> clients_on_LAN

So everything coming from the IAX-provider on port 4569 is forwarded to the Asterisk-server's WAN-interface (eth1).
This needs then be routed to an internal SIP-phone (an IVR-system will define which one) via eth0.

When a call is initiated from an internal SIP-phone (they register to the IP-address assigned to eth0) it needs to be routed via eth1 to the gateway ( Asterisk will setup an IAX-channel on WAN-interface (eth1) to the IAX-provider (via gateway).

So... will this work :

route add -net ip_IAXprovider netmask gw dev eth1

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Networking :: Sending Packets To The Local Interface Through A Route?

Oct 13, 2010

I want to build a topology of this kind:

|eth0 (a.a.a.a) |
Linux PC |<----------------> | ROUTER
|eth1 (b.b.b.b) |

the linux machine has two interfaces eth0 (a.a.a.a) and eth1 (b.b.b.b) connnected to two interfaces of a router. Now that if I send any packet destined to b.b.b.b from a.a.a.a interface on the linux machine, it should take the folowing path: eth0->router->eth1 . and it should be the same for vice versa.

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Networking :: Route Traffic From A Single Host Through A Specific Interface?

Aug 21, 2010

I have a linux router with 2 physical ISPs and a VPN tunnel that all my traffic passes through. I would like to setup a rule to redirect all traffic from one internal IP address (10.0.0.x) through the physical link only. My current script is as follows.

iptables -F
iptables -X
echo 1 > /proc/sys/net/ipv4/ip_forward


My goal is to do something similar to the mangle on the tor traffic, but for an entire host.

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Networking :: Route All Traffic Received By An Interface To Another And Vice Versa?

Mar 2, 2011

The task I am trying to complete is the virtualization of an IPv6 router created using two fedora machines. Here is the physical setup I have now...

PC1:eth0 <------> network
PC1:eth1 <------> PC2:eth0
PC1:eth2 <------> PC2:eth1

PC1 runs radvd to provide router advertisements to the network and a DHCPv6 server for stateful addresses.Each interface is configured on a separate subnet. PC2 runs a DNS server on eth0. PC2:eth1 is used as an IPv6 client for testing purposes. The connections from PC1 to PC2 are just crossover cables.I've created virtual machines of both PCs and have created 4 virtual adapters on the host machine for each of the local-only interfaces.Now I have this:

PC1:eth0 = HOST eth0
PC1:eth1 = HOST vboxnet0
PC1:eth2 = HOST vboxnet1


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Networking :: IPtables: Route Outgoing Traffic From Internal Host To Only Go A Internet Interface?

Nov 21, 2010

My Ubuntu Box has 3 interfaces. eth0 (Internal (External ISP DHCP)eth2 (External ISP Static IP)I need the outgoing traffic to internet for 1 of the internal pc ( to only go only go through eth2

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Ubuntu Networking :: Configure Wlan0 Interface With Static Ip?

May 19, 2010

I've looked everywhere and tried everything. All I want to do is set up a static ip with my wireless network interface wlan0.

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Ubuntu Networking :: Hostname Not Announced With Static Network Interface

Sep 17, 2010

My /etc/hostname is not announced on the local network (not showing up on my Mac nor router) when setting /etc/network/interfaces to:


iface eth0 inet static

I have tried bringing the interface up and down, and have also rebooted. If I change it to DHCP it will display, but this does not really help me.

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General :: IP Address Lookup - Where Are The Interface Configurations (set By Ifconfig, Not The Static Ones) Stored

Jan 28, 2011

where are the interface configurations (set by ifconfig, not the static ones) stored? I'm asking because I'm trying to understand, more broadly, the order of IP address lookup. If I ping the local machine (localhost, or one of the interfaces) no messages get sent out (at least according to wireshark), so some local lookup must be taking place.

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Networking :: Configure A Network Route To A Host For Testing Network Interface?

Aug 30, 2010

today I tried to configure a network route to a host for testing my network interface. Code: route add eth0 As I have to eth interfaces and both interface got their IP from DHCP ( and and are in the same subnet, I shut the other interface down:

Code: ifconfig eth1 down Then I tried to test the interface by doing a ping to
Problem: When I unplug the cable from eth0 (and eth1 is still plugged) the ping still works. Somehow my linux (it's debian) powers up again eth0 and pings over this port.

How can I stop my linux doing this. I just want to have the route added only on the one interface - not the other. Is it maybe some case of a default-gateway?

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Networking :: Route Non-vlan Packet To A Vlan Interface

Apr 20, 2010

do you know if there is any possibility to route/force non-vlan packet to a vlan interface in Linux?

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Networking :: Route Eth2 TCP Packets To Tun0 With IPTABLES And IP RULE/ROUTE?

May 8, 2011

I have 3 network interfaces on my Linux Router :

Interface - Gateway - Type


br0 - - Internet
eth2 - - LAN
tun0 - - VPN (via br0)

What I'd like to do is to route all TCP packets coming from eth2 to tun0 where a VPN client is running on If I delete all default routes and if I add a new route to tun0 like :


route del default
route add default gw

Everything is fine, and everyone on eth2 can reach the Internet using the VPN access. Now the problem is that my VPN client does not allow any other protocols other than TCP. And I also want to allow VPN access only to eth2, no other LAN nor the router itself. use iptables to filter any TCP packets and mark them, so they can be sent to tun0, while any other packets can reach the Internet via br0 ( I found on the Internet that we can mark packets before they get routed. Using the following commands :


iptables -t mangle -A PREROUTING -j MARK --set-mark 85 -i eth2 -p tcp --dport 80
ip route add table 300 default via dev tun0
ip rule add fwmark 0x55 table 300

First of all, --dport 80 never work... :/ I wanted to filter TCP 80 packets coming from eth2, but none of them seems to be HTTP packets... oO (very strange...). Nevermind, I decided to forget about the --dport option. I use the "iptables -L -v -t mangle" command to see how many packets are marked, and it is working fine, all TCP packets coming from eth2 are marked. Now the problem is that none of them are routed to tun0 they are all respecting the "route -n" rules... and not the "table 300" rule I have created.

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Networking :: Definition: "a Process That Replaces A Series Of Related, Specific Routes In A Route Table With A More Generic Route"

Oct 21, 2010

I got this definition:"a process that replaces a series of related, specific routes in a route table with a more generic route." honestly I found it not so clear.. I want to know if this definition is correct and also more details about this subject..

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Ubuntu Networking :: Error - "route: Netmask Does Not Match Route Address"

Jan 25, 2011

Having trouble getting my Netgear WNA1000 working thru wireless router. Have tried lots of suggestions from other threads to no avail. Someone suggested that th routing table isn't set correctly, so have been trying to use the follwing to make the proper entry in the routing table: sudo route add -net netmask dev wlan0

Result: error message stating with:
"route: netmask does not match route address"

followed by "Usage" instructions which tell me to do what I just did. Any ideas on how I can populate my routing table with correct entry for my wireless card? Not to complicate matters, but I temporarily turned off encryption on my router to eliminate that as a possibility until I get connected. So maybe it'still trying to connect via encrypted mode - do I need to turn off encryption on my (client) end?

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