Network No Suitable Device when creating ifcfg-eth1 - networking

Question

I need your help with some strange problem
We are trying to create an ifcfg-eth1 network device on our centos 7 server.
We are using the following information in the ifcfg-eth1 file;
TYPE=Ethernet
BOOTPROTO=static
DEVICE=eth1
ONBOOT=yes
IPADDR=192.168.101.61
NETMASK=255.255.255.0
GATEWAY=192.168.100.1
DNS1=8.8.8.8
DNS2=8.8.4.4
The ifcfg-eth0 work like it should, but when we create the ifcfg-eth1 we get the following error;
No suitable device found for this connection.
Full output from /var/log/messages
Oct 5 10:38:09 switch-onpremis1 network: ループバックインターフェイスを呼び込み中 [ OK ]
Oct 5 10:38:09 switch-onpremis1 network: インターフェース enp029f2u1 を活性化中: [ OK ]
Oct 5 10:38:10 switch-onpremis1 network: インターフェース eth0 を活性化中: [ OK ]
Oct 5 10:38:10 switch-onpremis1 NetworkManager[665]: <info> [1538703490.1107] audit: op="connection-activate" uuid="9c92fad9-6ecb-3e6c-eb4d-8a47c6f50c04" name="System eth1" result="fail" reason="No suitable device found for this connection."
Oct 5 10:38:10 switch-onpremis1 network: インターフェース eth1 を活性化中: エラー: 接続のアクティベーションに失敗: No suitable device found for this connection.
Oct 5 10:38:10 switch-onpremis1 network: [失敗]
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 network: RTNETLINK answers: File exists
Oct 5 10:38:10 switch-onpremis1 systemd: network.service: control process exited, code=exited status=1
Oct 5 10:38:10 switch-onpremis1 systemd: Failed to start LSB: Bring up/down networking.
Oct 5 10:38:10 switch-onpremis1 systemd: Unit network.service entered failed state.
Oct 5 10:38:10 switch-onpremis1 systemd: network.service failed.
What could be the problem of this?
Has it to do with our network card maybe?
Or could the problem be somewhere else?
Our settings for ifcfg-eth0 are;
TYPE=Ethernet
PROXY_METHOD=static
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=eth0
UUID=f3d98d60-6062-4b70-a14c-7ac4040bd403
DEVICE=eth0
ONBOOT=yes
IPADDR=192.168.100.60
PREFIX=24
GATEWAY=192.168.100.1
DNS1=8.8.8.8
Thank you for the suggestions.
Help is really appreciated.
We are already struggling with the same problem for the last three days.

Answer 1

Networking has changed with CentOS 7.x, Checkout the following:
Read 3. And what if I want the old naming back?
Also, check out 7. What have you done with ifconfig/netstat?
https://wiki.centos.org/FAQ/CentOS7