What is Gateway?
A gateway is a network point that acts as an entrance to another network. On the Internet, a node or stopping point can be either a gateway node or a host (end-point) node. Both the computers of Internet users and the computers that serve pages to users are host nodes. The computers that control traffic within your company’s network or at your local Internet service provider (ISP) are gateway nodes. In the network for an enterprise, a computer server acting as a gateway node is often also acting as a proxy server and a firewall server. A gateway is often associated with both a router, which knows where to direct a given packet of data that arrives at the gateway, and a switch, which furnishes the actual path in and out of the gateway for a given packet.
How to find default gateway?
rahul-linux:~$ ip route show
default via 192.168.1.1 dev eth1 proto static
192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.100 metric 1
rahul-linux:~$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
The flag U indicates that route is up and G indicates that it is gateway.
rahul-linux:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth1
How to find gateway?
[root@rhel7 ~]# routel
target gateway source proto scope dev tbl
10.0.0.0/ 8 10.1.1.56 kernel link enp0s3
10.0.0.0 broadcast 10.1.1.56 kernel link enp0s3 local
10.1.1.56 local 10.1.1.56 kernel host enp0s3 local
10.255.255.255 broadcast 10.1.1.56 kernel link enp0s3 local
127.0.0.0 broadcast 127.0.0.1 kernel link lo local
127.0.0.0/ 8 local 127.0.0.1 kernel host lo local
127.0.0.1 local 127.0.0.1 kernel host lo local
127.255.255.255 broadcast 127.0.0.1 kernel link lo local
[root@rhel7 ~]# cat /etc/sysconfig/network
GATEWAY="10.1.1.1"
[root@rhel7 ~]# routel | grep default
default 10.1.1.1 static enp0s3
default unreachable kernel lo unspec
default unreachable kernel lo unspec
A gateway is a network point that acts as an entrance to another network. On the Internet, a node or stopping point can be either a gateway node or a host (end-point) node. Both the computers of Internet users and the computers that serve pages to users are host nodes. The computers that control traffic within your company’s network or at your local Internet service provider (ISP) are gateway nodes. In the network for an enterprise, a computer server acting as a gateway node is often also acting as a proxy server and a firewall server. A gateway is often associated with both a router, which knows where to direct a given packet of data that arrives at the gateway, and a switch, which furnishes the actual path in and out of the gateway for a given packet.
How to find default gateway?
rahul-linux:~$ ip route show
default via 192.168.1.1 dev eth1 proto static
192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.100 metric 1
rahul-linux:~$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
The flag U indicates that route is up and G indicates that it is gateway.
rahul-linux:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth1
How to find gateway?
[root@rhel7 ~]# routel
target gateway source proto scope dev tbl
10.0.0.0/ 8 10.1.1.56 kernel link enp0s3
10.0.0.0 broadcast 10.1.1.56 kernel link enp0s3 local
10.1.1.56 local 10.1.1.56 kernel host enp0s3 local
10.255.255.255 broadcast 10.1.1.56 kernel link enp0s3 local
127.0.0.0 broadcast 127.0.0.1 kernel link lo local
127.0.0.0/ 8 local 127.0.0.1 kernel host lo local
127.0.0.1 local 127.0.0.1 kernel host lo local
127.255.255.255 broadcast 127.0.0.1 kernel link lo local
[root@rhel7 ~]# cat /etc/sysconfig/network
GATEWAY="10.1.1.1"
[root@rhel7 ~]# routel | grep default
default 10.1.1.1 static enp0s3
default unreachable kernel lo unspec
default unreachable kernel lo unspec
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