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Author Topic: Virtual Interfaces  (Read 3117 times)

xdaxdb

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Virtual Interfaces
« on: January 17, 2010, 07:05:27 AM »

I am leasing a VPS (virtual private server) which I use mainly for hosting a couple web sites. I want to add reachability ipv6 to my existing websites.

I already have the server set up with an ipv6 tunnel with a routed /48 (thank you Hurrucane Electric). The problem I am facing now is how to set up the ipv6 host addresses on the server.

The first idea that comes to mind is to set up sub-interfaces (eth0:0, eth0:1, etc.) with the ipv6 host addresses, but that bothers me. The reason it bothers me is because normaly when you create a sub-interface it is to allow connectivity to a network through that interface. But in this case I don't want to transmit or receive any data at all out of that sub-interface (it will send/receive data from the kernel).

I think a more apropriate solution would be to add more loopback interfaces to the server, but I don't know how to do that or if that is appropriate either.

Anybody out there ever donr something like this. Any input would be helpful.

Thanks
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kriteknetworks

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Re: Virtual Interfaces
« Reply #1 on: January 17, 2010, 08:06:31 AM »

Unlike ipv4, you don't use aliases to add ipv6 IPs to an interface.

ip addr add 2001:470:xxxx::1/64 dev eth0

as an example.
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FirefighterBlu3

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Re: Virtual Interfaces
« Reply #2 on: March 03, 2010, 02:17:10 AM »

for the record, ethX:Y is an ancient and deprecated form.  years ago the the distinction was made between "eth0" as the hardware interface, and "1.2.3.4/24" as the network interface.  you can add as many ipv4 or ipv6 addresses as pleases you to a hardware interface.  management of the hardware and networking are properly separated.

ip a a 10.0.0.1/24 dev eth0
ip a a 192.168.0.8/24 dev eth0
ip a a 10.99.99.99/32 dev eth0

ip a ls eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 100
    link/ether 00:04:23:cd:93:d2 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.1/24 brd 10.0.0.255 scope global eth0
    inet 192.168.0.8/32 scope global eth0
    inet 10.99.99.99/16 brd 10.99.255.255 scope global eth0
    inet6 fe80::20e:cff:fe67:a168/64 scope link
       valid_lft forever preferred_lft forever



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