Two interfaces do not work at the same time

ramil1994

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Hello!
I have one main interface eth0 and I added a second additional eth0:1 In the second I just put the ip and mask without a gateway. But when raising ifup eth0:1 İt is up but the main interface eth0 turns off and vice versa.
Removing /etc/udev/rules.d/70-persistent-net.rules and restarting tried, didn't help
 


Is your real, and virtual interfaces both on the same subnet? I'm assuming since
there is only one physical interface, there is only one router/switch?

How do you go through this router without a gateway?
 
yes there is only one physical interface. And it always works. and an additional one is needed just in order to send a ping to it from another address

İcma Tərəfindən Doğrulanmış ikonası
 
You didn't answer the subnet question.
 
I have a centos 6.8 vm with one lan interface

eth0 Link encap:Ethernet HWaddr 00:15:5D:94:80:04
inet addr:192.168.1.66 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::215:5dff:fe94:8004/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1371 errors:0 dropped:0 overruns:0 frame:0
TX packets:129 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:291997 (285.1 KiB) TX bytes:12901 (12.5 KiB)

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
TYPE=Ethernet
UUID=79c8e3e0-6ce8-40db-8de1-03066403f48b
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
NAME="System eth0"
HWADDR=00:15:5D:94:80:04
IPADDR=192.168.1.66
PREFIX=24
GATEWAY=192.168.1.1
DNS1=xx.xx.xx.xx
DNS2=xx.xx.xx.xx
LAST_CONNECT=1621877362

copied the ifcfg-eth0 to ifcfg-eth0:1
edit ifcfg-eth0:1
change DEVICE to eth0:1
change the IPADDR to your second address (in my case 192.168.1.67)
Don't worry about changing anything else
I did not touch anything in UDEV.

I rebooted, network restart may be OK.

I am now able to ssh into either address on the one interface.

[root@centos68 ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:15:5D:94:80:04
inet addr:192.168.1.66 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::215:5dff:fe94:8004/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:126 errors:0 dropped:0 overruns:0 frame:0
TX packets:89 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:23377 (22.8 KiB) TX bytes:9881 (9.6 KiB)

eth0:1 Link encap:Ethernet HWaddr 00:15:5D:94:80:04
inet addr:192.168.1.67 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
 

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