Re: 2nd IP address on an interface

Robert Moskowitz <rgm@xxxxxxxxxxxxxxx> · Thu, 28 Aug 2014 20:32:33 -0400

On 08/28/2014 07:20 PM, Ed Greshko wrote:
On 08/29/14 06:11, Robert Moskowitz wrote:
On 08/28/2014 04:24 PM, Tom Horsley wrote:
On Thu, 28 Aug 2014 16:16:55 -0400
Robert Moskowitz wrote:

So what is missing?  Do I need a 70-persistent-net.rules for eth0:0 ??
These days, I'm pretty sure you are supposed to include
IPADDR2=, NETMASK2=, etc. in the one ifcfg-eth0 file
rather than creating a eth0:0 file (at least that worked
for me on centos 6.5 this week when setting up IP aliases).
I added the IPADDR2 and NETMASK2 and it did not add the second address.  Even after a reboot.

You may be getting confused by using "ifconfig".....

[egreshko@f20f network-scripts]$ cat ifcfg-p2p1
TYPE="Ethernet"
BOOTPROTO=none
DEFROUTE="yes"
IPV4_FAILURE_FATAL=yes
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
NAME="p2p1"
UUID="5ce325cb-5048-48d7-bdc0-457f278fe1f1"
ONBOOT="yes"
DNS1=192.168.1.18
DOMAIN=greshko.com
HWADDR=08:00:27:B7:04:4A
IPADDR0=192.168.1.227
PREFIX0=24
GATEWAY0=192.168.1.1
IPADDR1=192.168.1.19
PREFIX1=24
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes

[egreshko@f20f network-scripts]$ ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
         inet 192.168.1.227  netmask 255.255.255.0  broadcast 192.168.1.255
         inet6 2001:470:d:6bd:a00:27ff:feb7:44a  prefixlen 64  scopeid 0x0<global>
         inet6 fe80::a00:27ff:feb7:44a  prefixlen 64  scopeid 0x20<link>
         ether 08:00:27:b7:04:4a  txqueuelen 1000  (Ethernet)
         RX packets 478  bytes 57719 (56.3 KiB)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 383  bytes 54641 (53.3 KiB)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

*BUT*

[egreshko@f20f network-scripts]$ ip addr
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
     link/ether 08:00:27:b7:04:4a brd ff:ff:ff:ff:ff:ff
     inet 192.168.1.227/24 brd 192.168.1.255 scope global enp0s3
        valid_lft forever preferred_lft forever
     inet 192.168.1.19/24 brd 192.168.1.255 scope global secondary enp0s3
        valid_lft forever preferred_lft forever
     inet6 2001:470:d:6bd:a00:27ff:feb7:44a/64 scope global noprefixroute dynamic
        valid_lft 7200sec preferred_lft 600sec
     inet6 fe80::a00:27ff:feb7:44a/64 scope link
        valid_lft forever preferred_lft forever

And from a second system....

[egreshko@meimei ~]$ ping 192.168.1.19
PING 192.168.1.19 (192.168.1.19) 56(84) bytes of data.
64 bytes from 192.168.1.19: icmp_seq=1 ttl=64 time=0.337 ms
64 bytes from 192.168.1.19: icmp_seq=2 ttl=64 time=0.290 ms
64 bytes from 192.168.1.19: icmp_seq=3 ttl=64 time=0.269 ms

# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
state UNKNOWN group default qlen 1000
    link/ether 02:56:02:01:f3:b9 brd ff:ff:ff:ff:ff:ff
    inet 208.83.67.163/28 brd 208.83.67.175 scope global eth0
    inet 208.83.67.164/28 brd 208.83.67.175 scope global secondary eth0
    inet6 fe80::56:2ff:fe01:f3b9/64 scope link
       valid_lft forever preferred_lft forever

you are right.  ifconfig USE to be able to do this, but now it is just a 
shell?  over ip and so...

So now to undo a lot of changes and see if I can get back to everything 
working.

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