Hi 
As suggested, I am able to run dhclient v4 with scripts added Its giving proper IPv4 address. I am trying to do the same
 for dhclient IPv6 version. dhclient is hanging. Could you help

# ./dhclient -v -6 tiw_sta0 -lf /tmp/dhclient.leases -cf /tmp/dhclient.conf -sf /tmp/dhclient-script
Internet Systems Consortium DHCP Client 4.1-ESV-R3
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

dhclient-script ===
dhclient-script QNX DHCP client script called reason: PREINIT6
dhclient-script SOCK RESOLV_TO_MEMORY 0 MODIFY_RESOLV 1
dhclient-script NO_DEF_ROUTE 0
dhclient-script interface tiw_sta0 medium pid 5169235 SOCK
dhclient-script addr /
dhclient-script new_routers
dhclient-script new_static_routes
dhclient-script new_dhcp6_name_servers
dhclient-script new_domain_search
dhclient-script new_domain_name
dhclient-script new_domain_name_servers
dhclient-script new_interface_mtu
dhclient-script new_subnet_mask
dhclient-script ===
Wifi Interface!!
Bound to *:546
Listening on Socket/tiw_sta0
Sending on   Socket/tiw_sta0
PRC: Soliciting for leases (INIT).
XMT: Forming Solicit, 0 ms elapsed.


> You need to fix your errors:
> 
> can't create /var/db/dhclient.leases: No such file or directory
> execve (/sbin/dhclient-script, ...): No such file or directory
> 
> dhclient only negotiates with the server, it uses dhclient-script to apply the
>  address to the interface.