I'm having a bizarre issue with my HP Proliant DL 360 G4p server. It has two gigabit ethernet interfaces but I can bring up only one of them. This is starting to freak me out and that's why I turned here. I'm running the x64 ubuntu 11.10 server edition.

lshw -c network shows that the second interface is disabled. I have no idea why ans how to enable it.

$ sudo lshw -c network
  *-network:0
       description: Ethernet interface
       product: NetXtreme BCM5704 Gigabit Ethernet
       vendor: Broadcom Corporation
       physical id: 2
       bus info: pci@0000:02:02.0
       logical name: eth0
       version: 10
       serial: 00:18:71:e3:6d:26
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 66MHz
       capabilities: pcix pm vpd msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.119 duplex=full firmware=5704-v3.27b, ASFIPMIc v2.36 ip=10.48.8.x latency=64 link=yes mingnt=64 multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:25 memory:fdf70000-fdf7ffff
  *-network:1 DISABLED
       description: Ethernet interface
       product: NetXtreme BCM5704 Gigabit Ethernet
       vendor: Broadcom Corporation
       physical id: 2.1
       bus info: pci@0000:02:02.1
       logical name: eth1
       version: 10
       serial: 00:18:71:e3:6d:25
       capacity: 1Gbit/s
       width: 64 bits
       clock: 66MHz
       capabilities: pcix pm vpd msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.119 firmware=5704-v3.27b latency=64 link=no mingnt=64 multicast=yes port=twisted pair
       resources: irq:26 memory:fdf60000-fdf6ffff

If I try to ifup eth1, then I get

$ sudo ifup eth1
Ignoring unknown interface eth1=eth1.

I figured that's what happens when there is no eth1 listed in /etc/network/interfaces. But when I add the configuration for eth1, I still can't ifup.

$ sudo ifup eth1
RTNETLINK answers: File exists
Failed to bring up eth1.
I've also tried ifconfig eth1 up but without any result.

For clarity, I have added a masked version of /etc/network/interfaces. I don't think it is the cause of the problem though.

$ cat /etc/network/interfaces
# 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
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 10.48.8.x
        netmask 255.255.255.y
        network 10.48.8.z
        broadcast 10.48.8.t
        gateway 10.48.8.u

auto eth1
iface eth1 inet static
        address   193.190.253.x
        netmask   255.255.255.y
        network   193.190.253.z
        broadcast 193.190.253.t
        gateway   193.190.253.u

I really need some help fixing this. It's driving me crazy. Thanks.