Getting way off topic here, and I'm sure you found this also, but ipconfig is useful for DHCP connection manipulation. I find its sufficient for my use although it doesn't do the activate/deactivate step. YMMV.
Example: ipconfig /release '*Builtin*' ipconfig /renew '*Wireless*' USAGE: ipconfig [/? | /all | /renew [adapter] | /release [adapter] | /flushdns | /displaydns | /registerdns | /showclassid adapter | /setclassid adapter [classid] ] where adapter Connection name (wildcard characters * and ? allowed, see examples) Options: /? Display this help message /all Display full configuration information. /release Release the IP address for the specified adapter. /renew Renew the IP address for the specified adapter. /flushdns Purges the DNS Resolver cache. /registerdns Refreshes all DHCP leases and re-registers DNS names /displaydns Display the contents of the DNS Resolver Cache. /showclassid Displays all the dhcp class IDs allowed for adapter. /setclassid Modifies the dhcp class id. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/