Multiple IP address

VARNICA · 11-14-2013, 05:41 AM

Hello,

I need to setup an network interface with two ip address. I add in /etc/rc.d/rc.inet1.conf

Code:

/etc/rc.d/rc.inet1.conf 


# Config information for eth0:
IFNAME[0]="eth0"
IPADDR[0]="192.168.1.230"
NETMASK[0]="255.255.255.0"
USE_DHCP[0]=""
DHCP_HOSTNAME[0]=""

# Config secondary ip address
IFNAME[1]="eth0:1"
IPADDR[1]="10.0.0.49"
NETMASK[1]="255.255.255.0"
USE DHCP[1]=""
DHCP_HOSTNAME[1]=""

But when restart network i have an error

Quote:

SIOCSIFFLAGS:Cannot assign requested address
cat: /sys/class/net/eth0:1/uevent: No such file or directory
cat: /sys/class/net/eth0:1/uevent: No such file or directory

What's the problem
???

ml4711 · 11-14-2013, 06:22 AM

You have to declare (create) the interface before you can use it!

A good way to create it is:

1. create this file and make it executable
"/etc/rc.d/rc.netdevice"

containing this command

"ifconfig eth0:1 up"

rc.netdevice is sourced from /etc/rc.d/rc.modules
(in slackware 14.0, but do not know if also in 14.1)

Now you just execute the rc.modules file and restart your network!

Edit: An alias interface is NOT a "real" interface,
and therefore not seen here.

Quote:

SIOCSIFFLAGS:Cannot assign requested address
cat: /sys/class/net/eth0:1/uevent: No such file or directory
cat: /sys/class/net/eth0:1/uevent: No such file or directory

so it seems you need to do it later manually in f.ex rc.local, i.e

Code:

ifconfig eth0:1 10.0.0.49 netmask 255.255.255.0 up

My first advice is needed if you want to make f.ex an vlan interface
and to configure it in rc.inet1.conf

Enjoy

VARNICA · 11-14-2013, 07:30 AM

Thanks,

I put in rc.local

Quote:

ifconfig eth0:1 10.0.0.49 netmask 255.255.255.0 up

and it works, but I'm still interested to managed it from rc.inet1.conf

ml4711 · 11-14-2013, 10:55 AM

Hello again

I have now looked at the script,
that generates the error message (/etc/rc.d/rc.wireless line 96)
and it is harmless. That line checks if it is a wireless interface.

If the alias interface works, when you start it from rc.inet1.conf,
then don't care about the error message - but if it really bothers you,
you have two possibilities.

If you do not have any wireless interfaces in your machine then remove
the executable bit from rc.wireless. Otherwise you have to patch the script
to remove ther error message (but this is not so good an idea, since it gets
overwritten next time the scripts is updated).

Anyway here you go, change the line

Code:

elif [ "$(cat /sys/class/net/${1}/uevent | grep DEVTYPE)" = "DEVTYPE=wlan" ]; then

to

elif [ "$(cat /sys/class/net/${1}/uevent 2>/dev/null | grep DEVTYPE)" = "DEVTYPE=wlan" ]; then

VARNICA · 11-14-2013, 04:36 PM

Hello thank you for help,

I am not traying to set up a wireless interface, I wont to set up a wierd lan interface with two ip address, from which I can connect to two separate network,

1. 192.168.1.0/24 network
2. 10.0.0.0/24 network

I follow your advice but the part i do not understand is

"Now you just execute the rc.modules file and restart your network!"

How to execute?

ml4711 · 11-15-2013, 05:28 AM

You only have to do one thing.

1. In rc.inet1.conf, as you already have done.

Code:

# Config secondary ip address
IFNAME[1]="eth0:1"
IPADDR[1]="10.0.0.49"
NETMASK[1]="255.255.255.0"
USE DHCP[1]=""
DHCP_HOSTNAME[1]=""

But you can do this too, if you like

2. Disable executable bit on rc.wireless
- this is NOT needed to get the interface up
but only to not get the error message which IS harmless

Code:

chmod -x /etc/rc.d/rc.wireless

And you are done :-)

The advice about rc.netdevice and rc.modules is not needed for
an alias interface, as it is created implicit with the ifconfig command.

It is only if you f.ex want to setup vlan interfaces from rc.inet1.conf,
then the interfaces have to be created beforehand.

To execute rc.modules or any other script, just type the name of the script and press ENTER:

Code:

/etc/rc.d/rc.modules 
and press ENTER.