Change Default Gateway or Default Router in Sun Solaris

The Default Gateway or the Default Router is the IP address (IPv4) to which all the traffic to any target destination(s) which does not have a route in the Routing Table of the server will be forwarded.

This Default Gateway is maintained in the file

/etc/defaultrouter [IPv4 only]

bash-3.00# cat /etc/defaultrouter
164.87.2.161

This IP Address should be in the same network or the subnet as that of the server itself.

If you wish to add or edit the Default Gateway or the Default Router in Sun Solaris, edit /etc/defaultrouter file and update the IP Address. One entry per line for one or more default gateways (very unlikely to have multiple default gateways).

This file is read at the boot time and hence the server needs to be rebooted for the changes to take effect.

Instead of rebooting the server, update the Kernel IP Routing table first by deleting the existing Default Gateway or Default Router (if any) and then adding the new IP address.

To view the existing Kernel IP Routing table,

# netstat -rn

Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
——————– ——————– —– —– ———- ———
default 164.87.2.161 UG 1 5
100.0.0.0 100.100.100.102 U 1 1 bge1
164.87.2.160 164.87.2.172 U 1 3 bge0
224.0.0.0 164.87.2.172 U 1 0 bge0
127.0.0.1 127.0.0.1 UH 38 3397 lo0

Now, remove the existing default gateway;

# route delete default 164.87.2.161

Add the new Default Gateway using:

# route add default 192.168.1.1

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