Network - Routing Table

> NetWork

1 - About

The routing information necessary for this is stored in the routing table.

You can set the entries in the routing table as:

  • being static (manually)
  • or dynamic (using the routing daemon process).

There are three ways of defining the target address as the routing entry:

  • Complete IP address of the target host (host route)
  • Only the network portion of the IP address (network route)
  • Default route (only one entry)

3 - Management

3.1 - Display

With Network - (netstat|network statistics) command-line tool:

netstat -r

output example:

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0    192.168.135.1  192.168.135.148     55
        10.0.75.0    255.255.255.0         On-link         10.0.75.1    271
        10.0.75.1  255.255.255.255         On-link         10.0.75.1    271
      10.0.75.255  255.255.255.255         On-link         10.0.75.1    271
...........
===========================================================================
Persistent Routes:
  None

IPv6 Route Table
===========================================================================
Active Routes:
 If Metric Network Destination      Gateway
  1    331 ::1/128                  On-link
  4    271 fe80::/64                On-link
  9   5256 fe80::/64                On-link
  6    311 fe80::/64                On-link
 19    271 fe80::/64                On-link
 29    281 fe80::/64                On-link
 29    281 fe80::3930:2a78:af12:6857/128   On-link

where In windows / linux, you may see this field:

  • Destination - Destination (Mask) specifies the host that is the destination endpoint of the route. Note that the IPv6 routing table shows the prefix for a 6to4 tunnel endpoint (fe80::/64) as the route destination endpoint.
  • Gateway specifies the gateway to use for forwarding packets.
  • Flags indicates the current status of the route.
    • The U flag indicates that the route is up.
    • The G flag indicates that the route is to a gateway.
  • Use: Shows the number of packets sent.
  • Interface - Indicates the particular interface on the local host that is the source endpoint of the transmission.
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