The default time for which a dynamically learnt Route entry in the routing table is 20mins (1200000ms)

To Display current Route holding time

To display the current time interval to hold a route entry

In Solaris 8/9/10

sunsolaris# ndd -get /dev/ip ip_ire_arp_interval
1200000

In earlier versions to Solaris 8

sunsolaris# ndd -get /dev/ip ip_ire_flush_interval

To modify the Route holding time 

This can be modified or reduced to a lower level. To modify the default time to say 15 mins

In Solaris 8/9/10

sunsolaris# ndd -set /dev/ip ip_ire_arp_interval 900000

In earlier versions to Solaris 8

sunsolaris# ndd -set /dev/ip ip_ire_flush_interval 900000

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]

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 muktiple 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
——————– ——————– —– —– ———- ———
192.168.1.0          192.168.1.10         U         1        195 hme0
224.0.0.0            192.168.1.10          U          1          0 hme0
default              192.168.1.1             UG        1        325
127.0.0.1            127.0.0.1               UH        5         92 lo0

Now, remove the dexisting default gateway;

# route delete default 172.1.1.1

Add the new Default Gateway using:

# route add default 192.168.1.1

This should help. For a detailed Man Page for /etc/defaultrouter click here.

To add a Static Route in Sun Solaris operating system, you can use the route command. This will dynamically update the Kernel IP Routing table. However, when a server is restarted, these routes will be lost. To prevent this from happening, add a startup script S76static-routes with all the route commands for the static route that needs to persist. This will ensure that the route gets added at boot time.

To use the route command,

Syntax:

# route add [net|host] <Addr> netmask <Mask> [GatewayAddr|-interface ] <metric>

Example:

Add a network

# route add net 10.10.10.0 netmask 255.255.255.0 192.168.1.1 1

same as

# route add 10.10.10.0/24 192.168.1.1 1

Add a host

# route add host 1.1.1.1 netmask 255.255.255.0 192.168.1.1 1

same as

# route add 1.1.1.1/24 192.168.1.1 1

To route the traffic through an interface instead of an IP Gateway

# route add 1.1.1.1/24 -interface hme0

To check that the roots are added to Kernel IP Routing table,

# netstat -rn

Routing Table: IPv4
Destination           Gateway           Flags  Ref   Use   Interface
——————– ——————– —– —– —— ———
192.168.1.0          192.168.1.1        U         1    273  hme0
224.0.0.0            192.168.1.1         U         1      0   hme0
default              192.168.1.1          UG        1    196

Static Routes at boot time

To make the routes available at boot time so the next time when the server reboots, the routes are still available. Add a startup script named as

/etc/rc2.d/S76static-routes

and add the required route commands as above.

Change the permissions for the file so that the file is executable by root.

# chmod 744 /etc/rc2.d/S76static-routes

This should help.