telnet and alias

Linux question, upgraded from Linux 6 to 7.1. BUT on the upgrade we lost the DNS config, the alias vitual host and a virtual host email address.
So question is how do i get them all back?
I ran the ifconfig eth0:1 ip.ad.dr.ess whic created the vitual host and ip address but when i reboot it loses this (how do i get it to stick?).
The DNS relies on that host address, but not 100% sure DNS is working correctly.
Also hoe do i configure so i can telnet ot the box? xinet.d is running but ????
Please help
Thanks
olly

In response to your first question. the way to get the ifconfig command to stick is to place the entire command, i.e., /usr/sbin/ifconfig ..... in the /etc/rc.local file. This file is the last file read upon system boot and is usually the one sysadmins edit for things such as this.

Hope this helps.