I'm trying to bind 8 x /24 subnets in Centos. I set up the usual primary in /etc/sysconfig/network-scripts/ifcg-eth0 for the default /29 assigned to the box. All good, I'm in ssh fine.
Now, I'm trying to add the additional 8 C classes of IPs using this method
cp -p ifcfg-eth0 ifcfg-eth0-range0
cp -p ifcfg-eth0 ifcfg-eth0-range1
cp -p ifcfg-eth0 ifcfg-eth0-range2
etc...
all the way through range7
I restart the network, first C class (range0) works fine, but range1-7 give off similar errors all the way through like this
error in ifcfg-eth0-range7: already seen device eth0:182 in ifcfg-eth0-range6
In network-scripts I have them as
fcfg-eth0-range0
ifcfg-eth0-range1
ifcfg-eth0-range2
ifcfg-eth0-range3
ifcfg-eth0-range4
ifcfg-eth0-range5
ifcfg-eth0-range6
ifcfg-eth0-range7
I even tried
Each range file loos like this…
[root@login-third network-scripts]# cat ifcfg-eth0-range0
DEVICE=eth0
TYPE="Ethernet"
IPADDR_START=xxx.xxx.38.2
IPADDR_END=xxx.xxx.254
range1 example…
[root@login-third network-scripts]# cat ifcfg-eth0-range1
DEVICE=eth0:1
TYPE="Ethernet"
IPADDR_START=xxx.xxx.39.2
IPADDR_END=xxx.xxx.39.254
I originally tried without the DEVICE line too, same errors.
What am I doing wrong here?
Best Answer
There shouldn't be a
DEVICE
in the range files.But there should be a
CLONENUM_START
.Setting that will correctly map the addresses to the virtual NICs without assigning the same device twice.
Example: in ifcfg-eth0-range0 you set
CLONENUM_START=0
.xxx.xxx.38.2 => eth0:0
xxx.xxx.38.3 => eth0:1
...
In ifcfg-eth0-range0 you set
CLONENUM_START=255
.xxx.xxx.39.2 => eth0:255
xxx.xxx.39.3 => eth0:256
...
See also:
https://wiki.centos.org/VladislavRastrusny/OneNICManyIPs