Route command is very helpful for every Linux Administrator, It's manipulate the kernel's IP routing tables. We can use to set up static routes to specific network or hosts via an interface and it has been configured with the ifconfig.
For example the machine name is gunsystem, It's alive and configured with IP By examining the route and ifconfig output can get in using following command,
Viewing a simple Kernel IP routing table with route,
-n option is show numerical addresses instead of trying to determine symbolic host names.
-C option is operate on the kernel's routing cache.
-e option is displaying the routing table netstat format
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
link-local * 255.255.0.0 U 1002 0 0 eth0
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
or
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
List Kernel’s Routing Cache Information
# route -Cn
or
# route -Cen
or
# route -Cen
Kernel IP routing cache
Source Destination Gateway Flags MSS Window irtt Iface
192.168.5.20 66.49.75.4 50.28.66.1 1500 0 57 eth0
31.184.135.205 192.168.5.20 192.168.5.20 l 0 0 0 lo
85.25.109.160 192.168.5.20 192.168.5.20 l 0 0 0 lo
192.168.5.20 37.193.251.108 50.28.66.1 1500 0 1227 eth0
213.33.98.173 192.168.5.20 192.168.5.20 l 0 0 0 lo
Also get IP routing table with route using following commnads,
# ip address show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:16:3e:d6:82:22 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.100/22 brd 192.168.1.255 scope global eth0
inet6 fe80::216:3eff:fed6:8222/64 scope link
valid_lft forever preferred_lft forever
or
# ip route show dev eth0
192.168.1.0/22 proto kernel scope link src 192.168.1.100
11.154.0.0/16 scope link metric 1002
default via 192.168.1.1
or
# ip route show dev eth0 table local
broadcast 192.168.1.0 proto kernel scope link src 192.168.1.100
broadcast 192.168.1.255 proto kernel scope link src 192.168.1.100
local 192.168.1.100 proto kernel scope host src 192.168.1.100
# ip route list
192.168.1.0/22 dev eth0 proto kernel scope link src 192.168.1.100
19.214.0.0/16 dev eth0 scope link metric 1002
default via 192.168.1.1 dev eth0
Use ping command :
# ping -R -c 1 -n 192.168.1.100
PING 192.168.1.100 (192.168.1.100) 56(124) bytes of data.
64 bytes from 192.168.1.100: icmp_seq=1 ttl=64 time=0.059 ms
RR: 192.168.1.100
192.168.1.100
192.168.1.100
192.168.1.100
--- 192.168.1.100 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.059/0.059/0.059/0.000 ms
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