Usefull configuration files

Shell
bash file configuration file: /etc/bashrc

System
Globe environment variable and startup program: /etc/profile

Connection tracking: /proc/net/ip_conntrack

Iptable configuration file: /etc/sysconfig/iptable

Log system configuration file: /etc/syslog.conf

Network interface configuration file: /etc/sysconfig/network-script/ifcfg-eth*

• TYPE= Ethernet or Token Ring
• USERCTL=no or yes whether allow normal user active or inactive this NIC
• IPV6INIT=no or yes whether can configure Ip version 6 address with this NIC
• PEERDNS=yes or no whether get DNS info from DHCP server
• BOOTPROTO=static, none or DHCP

Port for each service: /etc/services