making eth0 to primary nic

[kanjah]

hi there, ave installed ubuntu 12 server, with 2 NIC cards, choose eth0 to be primary during installation, for squid3 proxy. Nw internet only works with eth1 not eth0 which is the primary. due to this i cant configure the iptables and lan. running sudo nano /etc/network/interfaces
shows

#the primary network interface

auto eth0 inet static
address 81.25.128.x
netmask 255.255.255.x
gateway 81.25.128.x
#dns -xoptions are implemented by the resolvconf package,
dns-nameservers 91.x.x.x 91.x.x.x

iface eth1 inet static
address 81.25.128.x
netmask 255.255.255.x
brodcast 81.25.128.x


any advice?
thanks

[Cheesehead]

Check your persistent-net.rules file under /etc/udev/rules.d/

Both NICs should be there - the rule tells which MAC address should be which eth#. Perhaps they've been switched? If so, fix them and reboot to see if that fixes the problem.

If udev rules are correct but you still have the problem, next look at the boot log using dmesg | grep eth . Look for mesages about interfaces coming up, going down, or getting renamed. Post them here.

[kanjah]

thanks for the reply, run /etc/udev/rules.d/ and this is the output

#PCI device 0x14e4:/sys/devices/pci0000:00/0000:1c.2/0000:02:00.0(tg3)
SUBSYSTEM=="net", ACTION=="add",DRIVERS=="?*", ATTR{address}=="d0:67:e5:23:88:0f", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

#PCI device 0x1106:/sys/devices/pci0000:00/0000:1e.0/0000:03:01.0(via-rhine)
SUBSYSTEM=="net", ACTION=="add",DRIVERS=="?*", ATTR{address}=="14:d6:4d:54:4d:8c", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

i dont understand these, eth0 is inbuilt, whilst eth1 is pci

[kanjah]

hi there, ave installed ubuntu 12 server, with 2 NIC cards, choose eth0 to be primary during installation, for squid3 proxy. Nw internet only works with eth1 not eth0 which is the primary. due to this i cant configure the iptables and lan. running sudo nano /etc/network/interfaces
shows

#the primary network interface

auto eth0 inet static
address 81.25.128.x
netmask 255.255.255.x
gateway 81.25.128.x
#dns -xoptions are implemented by the resolvconf package,
dns-nameservers 91.x.x.x 91.x.x.x

iface eth1 inet static
address 81.25.128.x
netmask 255.255.255.x
brodcast 81.25.128.x

and running /etc/udev/rules.d/

#PCI device 0x14e4:/sys/devices/pci0000:00/0000:1c.2/0000:02:00.0(tg3)
SUBSYSTEM=="net", ACTION=="add",DRIVERS=="?*", ATTR{address}=="d0:67:e5:23:88:0f", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

#PCI device 0x1106:/sys/devices/pci0000:00/0000:1e.0/0000:03:01.0(via-rhine)
SUBSYSTEM=="net", ACTION=="add",DRIVERS=="?*", ATTR{address}=="14:d6:4d:54:4d:8c", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

anyone please help me....

[ahallubuntu]

You're close. Edit the file /etc/udev/rules.d/70-persistent-net.rules and swap eth0 and eth1 and reboot. That will swap eth0 and eth1. Change the interfaces file too, of course.

[kanjah]

thank you, it works

[kanjah]

thank you

[coffeecat]

Threads merged. Please do not create duplicate threads. This dilutes community effort.