How do I change the IP address or hostname or both on Solaris/x86?

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How do I change the IP address or hostname or both on Solaris/x86?

See the instructions in "man sys-unconfig"
Basically, sys-unconfig unconfigures the machine to make it ready to
be configured again on reboot. It's a lot easier and less error prone than
the usual dozen or so steps required to purge the old IP address.
Update: (11/2001): sys-unconfig is seriously broken for Solaris 8 FCS
(2/2000) and will make your system unbootable.
If you use it make sure you have a later HW update of Solaris 8 or
that you apply x86 patch 109319.
Use "showrev -p" to confirm you have this patch.

For the thrill-seekers among us, you can also do it "by-hand"
by editing these files (possibly more?) with your fav. editor:



/etc/defaultdomain       Set the default NIS domain name, if any, if it changed.


/etc/defaultrouter       Set the default router's IP address, if it changed.


/etc/hostname.le0        (or .hme0 or ?) Update if the hostname changed.


/etc/hostname6.le0       (or .hme0 or ?) Ditto, if you use IPv6.


/etc/hostname6.ip.tun0   Update if you use a IPv4/IPv6 tunnel (e.g., 6bone)


/etc/nodename            Update if the hostname changed.


/etc/nsswitch.conf       Update if your name resolution method/order changed.


/etc/resolv.conf         Update if your name servers/domain changed (DNS only).


/etc/inet/hosts          Make sure your IP address is updated or added here.


                         List your FQDN is first, before the short hostname.


                         E.g., "192.168.128.64 foo.bar.com foo"


/etc/inet/ipnodes        IPv6 version of hosts file (Solaris 8+).


/etc/inet/netmasks       Set your network number & netmask, if it changed.


/etc/inet/networks       Set your network name, if it changed.


/etc/net/ticlts/hosts    For the streams-level loopback interface.


/etc/net/ticots/hosts    For the streams-level loopback interface.


/etc/net/ticotsord/hosts For the streams-level loopback interface.

To verify you changed all the files, type this as root:
find /etc -type f -print|xargs grep `hostname`

[Thanks to Parthiv Shah, Vijay Brian Gupta, Michael Wang, and Igor Sobrado,
Chad Treece]

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