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How to set up internal routing between virtual interfaces and real ethernet interface (Linux)

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http://serverfault.com – I have a Linux box with one real (as opposes to virtual, a.k.a. aliased) Ethernet interface I can use (eth0 is used for other purposes - can't use it, nor can I add more NICs). Say it's eth1 I need to control some objects/entities via SNMP, so I set up a virtual Ethernet interface for each object, with its appropriate MAC address. I do this by (example for vif1): ip -family inet link add link eth1 name vif1 address <the MAC addr> type macvlan ip link set vif1 up multicast on ip route del default dev vif1 table main /* enable the pings/TFTP going out! */ ip route add default via 192.168 (HowTos)

xskl's picture
Submitted by xskl on 11/18/2011 – Made popular on 11/18/2011

Stories similar to How to set up internal routing between virtual interfaces and real ethernet interface (Linux)

I am trying to run PTPDV2 (precision timing protocol) server which binds on interface for setting up multicasting.

I have a following virtual interface

eth1:0 Link encap:Ethernet HWaddr 00:00:50:A0:42:BD inet addr:10.2.0.17 Bcast:10.2.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Base address:0xa000

Now, I don't have any issue

I have a PPPoE connection on my Linux Machine (CentOS kernal 2.6.32) as a client, so that when I setup this connection, another virtual tunnel interface comes up, i.e., ppp0

This connection is setup over existing the physical interface eth0.

I'm running Fedora 11 x64 on a workstation with two network interfaces, a conventional ethernet line to another computer, and an old Aironet wireless PCI card. My problem is that Fedora insists on using DHCP to assign the internet address for the wireless, though my configuration specifies a static address.

looking for someone that has set up vpn on a vps before as i having issues connecting , i think its to do with etc/network/interface file with i have to edit via /interface.template

as i dont have eth0 interface only virtual connection

auto lo iface lo inet loopback address 127.0.0.1 netmask 255.0.0.0 broadcast 127.255.255.255 up ip route replace 127.0.

I currently have 2 gbit network interfaces bonded as bond0.

Ranmaru wrote:I think the problem is that NetworkManager generally prefers ethernet over WiFi and thus tries to route all traffic through eth0 as soon as you connect the cable.I guess you could fix it by using your routing table to prefer the wireless connection over ethernet, but then you would have the problem the other way around.

Hi, 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 1.1.1.1 & 1.1.2.1. In this configuration two instances of the program can communicate and everything is fine.

Hi All,

I have 2 NICs in my U9.04 Server box (eth0, eth1). After I added 2 virtual interfaces for each physical interface (eth0:1,eth0:2,eth1:1,eth1:2), the MAC addresses of all the interfaces have changed to that of eth0. Because eth1 was configured to be on my local network, I can't access the box remotely anymore.

I have a Red Had Linux machine with two NICs:

eth0 - 10.0.1.253 | 255.0.0.0 eth1 - 10.0.1.1 | 255.255.255.0

So the first one is on a class A subnet, the second is on a class C subnet.