How to change IP address permanently on Solaris 10

Hi Solaris Experts,
I would like to update an IP address permanently but believes ifconfig
only does it on the fly and will revert back once the Solaris 10 Sun Fire server
is rebooted:
( i ) # uname -a
SunOS angel 5.10 Generic_139556-08 i86pc i386 i86pc
( ii ) # ifconfig -a
bge0: flags=201000803<UP,BROADCAST,MULTICAST,IPv4,CoS> mtu 1500 index 2
inet 10.56.120.37 netmask fffffc00 broadcast 10.56.123.255
ether 0:1e:68:9b:30:33
nge0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 4
inet 203.20.160.62 netmask ffffff00 broadcast 203.20.160.255
ether 0:1e:68:9b:30:35
nge0:1: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index4
inet 203.20.160.81 netmask ffffff00 broadcast 203.20.160.255
nge1: flags=201000803<UP,BROADCAST,MULTICAST,IPv4,CoS> mtu 1500 index 5
inet 10.56.120.40 netmask fffffc00 broadcast 10.56.123.255
ether 0:1e:68:9b:30:36
( iii ) # vi /etc/inet/hosts (/etc/inet/ipnodes is softlinked to /etc/inet/hosts)
#10.56.120.37 angel angel.apple.com loghost
203.20.160.91 angel angel.apple.com loghost
( iv ) # svcadm restart network/physical
( v ) # ifconfig -a
bge0: flags=201000803<UP,BROADCAST,MULTICAST,IPv4,CoS> mtu 1500 index 2
inet 203.20.160.91 netmask ff000000 broadcast 203.255.255.255
ether 0:1e:68:9b:30:33
nge0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 4
inet 203.20.160.62 netmask ffffff00 broadcast 203.20.160.255
ether 0:1e:68:9b:30:35
nge0:1: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index4
inet 203.20.160.81 netmask ffffff00 broadcast 203.20.160.255
nge1: flags=201000803<UP,BROADCAST,MULTICAST,IPv4,CoS> mtu 1500 index 5
inet 10.56.120.40 netmask fffffc00 broadcast 10.56.123.255
ether 0:1e:68:9b:30:36
However, I want the correct netmask & broadcast are 255.255.255.0 & 203.20.160.255
respectively, the same as nge0: (203.20.160.62) & nge0:1 (203.20.160.81).
The following ifconfig command does update the IP address together with both correct netmask & broadcast
but don't believe that this change will stay after reboot:
#ifconfig bge0 inet 203.20.160.91 netmask 255.255.255.0 broadcast 192.168.1.255
The value in /etc/netmasks (softlinked to /etc/inet/netmasks) is:
10.56.120.0 255.255.252.0
The value in /etc/defaultrouter is:
203.20.160.1
In short, which other files also need to be updated to pickup the correct netmask (255.255.255.0)
& broadcast (203.20.160.255) permanently, without having to reboot the server?
Thanks in advance,
Jack

Hi Nik,
Thanks for your advice once again but are you able to provide the reason behind your suggestion, so that I won't blindly making this change without knowing why?
I understand how IP and netmask are use in general but do not understand how to setup /etc/inet/netmasks to offset both 10.56.120.0 & 203.20.160.0 subnetworks as well as getting different broadcasts for each.
It is necessary to just as importing to learn from this exercise as much as making the change itself. This is a production server and I must be absolutely convinced that this change will work before applying it. Past attempt has not been successful which caused unnecessary downtime.
Many thanks again,
Jack

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