[root@gateway ~]# ls -l /etc/sysconfig/network-scripts/ifcfg-*
-rw-r--r-- 1 root root 71 Mar 4 2019 /etc/sysconfig/network-scripts/ifcfg-eno 1
-rw-r--r-- 1 root root 138 Mar 4 2019 /etc/sysconfig/network-scripts/ifcfg-eno 2
-rw-r--r-- 1 root root 45 Oct 21 16:45 /etc/sysconfig/network-scripts/ifcfg-eth 0.500
-rw-r--r-- 1 root root 254 Aug 24 2018 /etc/sysconfig/network-scripts/ifcfg-lo
-rw-r--r-- 1 root root 368 Mar 4 2019 /etc/sysconfig/network-scripts/ifcfg-ppp 0
ifcfg-eth0.500 file
DEVICE=ppp0
TYPE="xDSL"
USERCTL="no"
BOOTPROTO="dialup"
NAME="DSLppp0"
ONBOOT="yes"
PIDFILE="/var/run/pppoe-ppp0.pid"
FIREWALL="NONE"
PING="."
PPPOE_TIMEOUT="80"
LCP_FAILURE="5"
LCP_INTERVAL="20"
CLAMPMSS="1412"
CONNECT_POLL="6"
CONNECT_TIMEOUT="80"
DEFROUTE="yes"
SYNCHRONOUS="no"
ETH="eno1.500"
PROVIDER="DSLppp0"
PEERDNS="yes"
USER="ISP LOGIN"
MTU="1600"
chap-secrets Is same as the old backup
i think my vlan 500 is gone