fixed ip for more than 1 nic - more than 1 network - multi homed
 

Friends,

I have been struggling with the ubuntu 11.04.

I have 2 nic cards and wish the machine to be in 2 diff networks.

here is my /etc/network/interfaces file
-----
auto lo
iface lo inet loopback

auto eth0

iface eth0 inet static
address 10.100.100.16
netmask 255.0.0.0
gateway 10.1.1.1


auto eth1

iface eth1 inet static
address 172.16.100.16
netmask 255.255.0.0

-------------------------------------------------------
here is my /etc/resolv.config file


# Generated by NetworkManager
nameserver 208.233.14.16
nameserver 208.233.14.226
-------------

It seems that taking manual control from DHCP is really hard
It also seems that having 2 nic in 2 nets is hard.


I am unable to ping 172.16.100.14 which is connected via a known good crossover.

-----------
a /sbin/ifconfig show that the 10 net is still getting DHCP
( 10.2.1.NNN )


eth1 Link encap:Ethernet HWaddr 00:1c:c4:17:cf:c3
inet addr:172.16.100.16 Bcast:172.16.255.255 Mask:255.255.0.0
inet6 addr: fe80::21c:c4ff:fe17:cfc3/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:71 errors:0 dropped:0 overruns:0 frame:0
TX packets:726 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5714 (5.7 KB) TX bytes:177842 (177.8 KB)
Interrupt:17

eth2 Link encap:Ethernet HWaddr 00:14:d1:1d:2f:15
inet addr:10.2.1.154 Bcast:10.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::214:d1ff:fe1d:2f15/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:378791 errors:0 dropped:0 overruns:0 frame:0
TX packets:1975 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:37236121 (37.2 MB) TX bytes:300314 (300.3 KB)
Interrupt:56 Base address:0xe000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:3447 errors:0 dropped:0 overruns:0 frame:0
TX packets:3447 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:279472 (279.4 KB) TX bytes:279472 (279.4 KB)


Thanks for any help with this.
( i thought unity was bad until i tried to have 2 nic w 2 fixed ipNums , so is Ubuntu just going to be for tablets and such in the future ? )

Now I have to guess a little - not running Ubuntu myself but pure Debian.
If you don't have a network-manager (there are several but I think Ubuntu's is actually named network-manager) then a Debian-system uses /etc/network/interfaces for nic-configuration.
However, I do believe Ubuntu uses a special manager for networking (as mentioned) this means you have to configure your nic's through that.
Look at your post: you have configured eth0 & eth1 in /etc/network/interfaces, but ifconfig shows eth1 & eth2.
Nope. Wrong.
Well, of course anything you don't master might seem 'hard' - but for you, here, I think all you need is understanding in how your distro handles networking. Once you get configuration right it will just work.
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So to make it clear: Checkout Ubuntus network-manager and configure your nic's there. Forget about /etc/network/interfaces it is not read.