Route Table
- A route table is a data structure used by network devices (such as routers, firewalls, and computers) to determine
how to forward packets to their destination
- It contains a set of rules (routes) that specify how packets should be directed based on their destination IP address.
Structure
| Destination |
Netmask |
Gateway |
Interface |
Metric |
| 0.0.0.0 |
0.0.0.0 |
192.168.1.1 |
eth0 |
0 |
| 192.168.1.0 |
255.255.255.0 |
0.0.0.0 |
eth0 |
0 |
ip route show
# default via 192.168.1.1 dev eth0
# 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.100
0.0.0.0/0
0.0.0.0/0 represents a network route that matches any IP address. It's a shorthand notation for "any destination"- In routing terms it is called the
default route, meaning it catches all traffic that doesn't match a more specific route in the routing table