Hi everybody,
I am using ubuntu-8.04 with kernel 2.6.24-23-generic.I have two interfaces eth0 and eth1,of these interfaces, on eth0 i have configured ipv6 addr. 2001:468::3 and on eth1 dhcp is there.But, when i restart the network by "#/etc/init.d/networking restart" command then im able to get dhcp on eth1 but im not getting static ipv6 address on eth0.I am getting folling information for eth0---->
ifconfig: can not resolve `up': Unknown host
Failed to bring up eth0.

Please HELP me why im getting this message and how to resolve this.(note- I am able to get dhcp on eth0 interface).
Thanks Alot...

try

YA, i have tried this one already and my /etc/network/interfaces file contents is below----
auto lo
iface lo inet loopback
iface eth1 inet dhcp
auto eth1
#pre-up modprobe ipv6
#iface eth0 inet manual
#up ifconfig $IFACE up
#up ifconfig $IFACE promisc
#up ifconfig $IFACE -arp
#down ifconfig $IFACE down

iface eth0 inet6 static
address 2001:468::3
netmask 64
auto eth0

but still im not getting my interface address as 2001:468::3 on eth0. Help me..

if you are not in an ipv6 network, you need to change the settings

auto eth0
iface eth0 inet static
address xxx.xxx.xxx.xxx
netmask xxx.xxx.xxx.xxx
network xxx.xxx.xxx.xxx
broadcast xxx.xxx.xxx.xxx
etc..............

No, i have intensionally made it for ipv6 network only.that is why i have used 'inet6' instead of 'inet',so now what to do?

And also when i restart my network by "/etc/init.d/networking restart" command then its last stanza shows--ifconfig: can not resolve `up': Unknown host
Failed to bring up eth0. what things should i try so that i would be able to get "2001:468::3" address on eth0 interface.[note:- earliar i was able to get this addr. on eth0 but now suddenly im not getting it]

Thanks for Replying...

$ sudo ifdown eth0
$ sudo ifup eth0

I am sure that is what you did from the command line. I usually do not those commands in interfaces. interfaces is a data file not a command file from what little I understand.

I tried above commands from the command line. it gives following outputs whenever im using these commands:
# sudo ifdown eth0
ifconfig: can not resolve `down': Unknown host
# sudo ifup eth0
ifconfig: can not resolve `up': Unknown host
I also tried "ifconfig eth0 down" & "ifconfig eth0 up" but still its waste....Help Me..

Try

ip link set eth1 up

For more info on this command(group) type man ip, it comes with a lot of options to assign address, subnet and all other possibilities.

Kind regards,

Eric

I tried this command also, but still im not getting ipv6 static ip as 2001:468::3 on eth0 interface.

Try to add the configuration again to the device using the ip command rather than editing the interfaces file. For the exact syntax read the man page of ip (man ip), because I'm not sure but it should be something like this:

ip address add eth1 local 2001:468::3 scope global

Again I'm not sure about this so please read the man page for correct syntax.

After setting it succesfully, shut down the interface and bring it up again, to see if it works. If it works looking at what got written in your interfaces file should show if you had forgotten something before.