It seems IOS listens to UDP 67 by default. In newer IOS versions (12.1, 12.2) I can turn this off with "no service dhcp". I haven't found a way to do this on my 12.0S systems. Does anybody know how to prevent 12.0S systems from listening to UDP 67? Steinar Haug, Nethelp consulting, sthaug at nethelp.no