Changing the IP Address and Host Name

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Ann McCormick
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1 Changing the IP Address and Host Name For Solaris version 10: cat /etc/release Oracle Solaris 10 9/10 s10x_u9wos_14a X86 Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. Assembled 11 August 2010 (A) To change hostname: /etc/nodename /etc/hosts (Optional - if old hostname exists with respect to interface name, in file - /etc/hostname.* e.g /etc/hostname.e1000g0 ) (B) To change IP /etc/hosts /etc/hostname.<interfaces> where <interfaces> are the names of the interface, e.g. bge0, bge1, eri0, e1000g0. In this file (/etc/hostname.<interfaces>), you must specify network configuration information such as IP address, netmask etc. The netmask entry is optional. If you do not specify it, the default netmask is assumed. ls -ltrh /etc/hostname.* -rw-r--r-- 1 root root 38 Oct 12 20:26 /etc/hostname.e1000g0 -rw-r--r-- 1 root root 36 Oct 12 23:44 /etc/hostname.e1000g1 -rw-r--r-- 1 root root 37 Oct 13 16:18 /etc/hostname.e1000g2 Note: Any change to /etc/hosts, will to reflect the change to files /etc/inet/hosts and /etc/inet/ipnodes, as all 3 files point to one main file (/etc/inet/hosts). ls -l /etc/hosts lrwxrwxrwx 1 root root 12 Oct /etc/hosts ->./inet/hosts ls -l /etc/inet/hosts -rwxr-xr-x 1 root sys 148 Oct 13 16:19 /etc/inet/hosts ls -l /etc/inet/ipnodes lrwxrwxrwx 1 root root 7 Oct /etc/inet/ipnodes ->./hosts (C) If you are moving to a new subnet, check/edit: /etc/inet/netmasks /etc/defaultrouter /etc/resolv.conf ********************* Then reboot the system. ********************* 1 P a g e

2 Example: Change Hostname and IP Address in Solaris 10 Hostname : From - To - mgracsolsrv64bit1 IPaddress for Interface (e1000g0) : From To Netmask changes if required : From To Default router address changes : To (A) Check Current details: id -p uid=0(root) gid=0(root) projid=1(user.root) hostname ifconfig -a inet netmask ffffff00 broadcast modinfo grep -i net 59 fffffffff7b0e000 25e0-1 neti (netinfo module) 162 fffffffff7fcc d e1000g (Intel PRO/1000 Ethernet ) dmesg grep -i net Oct 6 14:15:26 e1000g: [ID kern.info] Intel(R) PRO/1000 Network Connection, Driver Ver (B) Next, change the system's host name and the IP address of interface e1000g0 in the appropriate files: cat /etc/nodename vi /etc/nodename mgracsolsrv64bit1 ls -l /etc/inet/hosts -r--r--r-- 1 root sys 107 Oct 6 14:41 /etc/inet/hosts cat /etc/hosts Internet host table loghost 2 P a g e

3 Note: Any change to /etc/hosts, will to reflect the change to files /etc/inet/hosts and /etc/inet/ipnodes, as all 3 files point to one main file (/etc/inet/hosts). New: chmod 755 /etc/inet/hosts ls -l /etc/inet/hosts -rwxr-xr-x 1 root sys 134 Jul 9 18:05 /etc/inet/hosts vi /etc/hosts Internet host table mgracsolsrv64bit1 loghost cat /etc/inet/ipnodes Internet host table mgracsolsrv64bit1 loghost Reverting the permissions Back : chmod 444 /etc/inet/hosts ls -l /etc/inet/hosts -r--r--r-- 1 root sys 107 Oct 6 14:41 /etc/inet/hosts Now change the hostname for the interface /etc/hostname.e1000g0 cat /etc/hostname.e1000g netmask vi /etc/hostname.e1000g netmask Finally, change the netmask and the IP address of the default router. ls -l /etc/netmasks lrwxrwxrwx 1 root root 15 Jul 7 18:50 /etc/netmasks ->./inet/netmasks ls -l /etc/inet/netmasks -r--r--r-- 1 root sys 413 Jul 9 18:09 /etc/inet/netmasks 3 P a g e

4 cat /etc/netmasks The netmasks file associates Internet Protocol (IP) address masks with IP network numbers. network-number netmask The term network-number refers to a number obtained from the Internet Network Information Center. Both the network-number and the netmasks are specified in "decimal dot" notation, e.g: chmod 755 /etc/inet/netmasks New: cat /etc/netmasks The netmasks file associates Internet Protocol (IP) address masks with IP network numbers. network-number netmask The term network-number refers to a number obtained from the Internet Network Information Center. Both the network-number and the netmasks are specified in "decimal dot" notation, e.g: chmod 444 /etc/inet/netmasks Change /etc/defaultrouter only if it requires DNS lookup cat /etc/defaultrouter vi /etc/defaultrouter P a g e

5 Now Check hostname and IP address : hostname ifconfig -a inet netmask ffffff00 broadcast As seen above Hostname and IP address is still unchanged after changing the required files, This would need the system Reboot, to get the values or change in effect. To Change the IP Address For the Current Session, after reboot it reverts to old IP ifconfig e1000g netmask broadcast + up Note : ( putty will get disconnected ) after above command ifconfig -a inet netmask ffffff00 broadcast Reboot Server to reflect the above Modified changes init 6 Verify the change: hostname mgracsolsrv64bit1 ifconfig -a inet netmask ffffff00 broadcast As seen above Hostname and IP address got changed after the system Reboot. References: P a g e

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