Na Red Hat, a configuração IP (se a pessoa configurar a interface através das ferramentas do RH), estará nos arquivos ifcfg-INTERFACE. Aqui está um exemplo.
[root@server network-scripts]# cat ifcfg-eth0:1
# Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller
DEVICE=eth0:1
BOOTPROTO=none
BROADCAST=192.168.16.255
IPADDR=192.168.16.201
NETMASK=255.255.255.0
NETWORK=192.168.16.0
GATEWAY=192.168.15.7
TYPE=Ethernet
ONPARENT=yes
Em alguns casos, as rotas também estarão em um arquivo separado com o nome da interface:
[root@servername network-scripts]# cat route-eth0
ADDRESS0=192.168.16.0
NETMASK0=255.255.255.0
GATEWAY0=192.168.15.1
ADDRESS1=192.168.17.0
NETMASK1=255.255.255.0
GATEWAY1=192.168.15.1
ADDRESS2=192.168.18.0
NETMASK2=255.255.255.0
GATEWAY2=192.168.15.1
A partir da linha de comando, você pode executar ip addr ou ip route também:
[root@servername network-scripts]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether f4:6d:04:03:b4:18 brd ff:ff:ff:ff:ff:ff
inet 192.168.15.200/24 brd 192.168.10.255 scope global eth0
inet 192.168.16.201/24 brd 192.168.16.255 scope global eth0:1
inet 192.168.17.201/24 brd 192.168.17.255 scope global eth0:2
inet 192.168.18.202/24 brd 192.168.18.255 scope global eth0:5
inet 192.168.15.201/24 brd 192.168.15.255 scope global secondary eth0:3
inet 192.168.16.202/24 brd 192.168.16.255 scope global secondary eth0:4
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether e0:b9:a5:00:ea:14 brd ff:ff:ff:ff:ff:ff
[root@servername network-scripts]# ip route
255.255.255.255 dev eth1 scope link
192.168.15.0/24 dev virbr0 proto kernel scope link src 192.168.15.100
172.16.15.0/24 dev eth1 proto kernel scope link src 172.16.15.1
192.168.122.0/24 via 192.168.15.100 dev virbr0
169.254.0.0/16 dev eth1 scope link metric 1003
169.254.0.0/16 dev virbr0 scope link metric 1004
default via 192.168.15.1 dev virbr0
Ou:
[root@servername network-scripts]# ip route
192.168.18.0/24 dev eth0 proto kernel scope link src 192.168.18.202
192.168.17.0/24 dev eth0 proto kernel scope link src 192.168.17.201
192.168.16.0/24 dev eth0 proto kernel scope link src 192.168.16.201
192.168.15.0/24 dev eth0 proto kernel scope link src 192.168.15.200
169.254.0.0/16 dev eth0 scope link
default via 192.168.15.7 dev eth0
(A última saída é de uma máquina do tipo RH5)