Found this on CCO, I assume the prefix would be the same concept, a sanity check. Link is at the bottom, HTH.
Q. Why do I need to specify a subnet mask when configuring a NAT address pool? A. The subnet mask is used to sanity-check the addresses allocated from the pool (so we don't allocate the subnet broadcast address, for example). The subnet mask must match the size of the subnet into which you are translating. http://www.cisco.com/warp/public/cc/pd/iosw/ioft/iofwft/prodlit/iosnt_qp.htm ~-----Original Message----- ~From: Paul Borghese [mailto:[EMAIL PROTECTED]] ~Sent: Sunday, March 10, 2002 5:49 PM ~To: [EMAIL PROTECTED] ~Subject: NAT concepts [7:37815] ~ ~ ~Hi, ~ ~I am trying to conceptually understand the NAT command: ~ ~ip nat pool name start-ip end-ip {netmask netmask | prefix-length ~prefix-length}[type rotary] ~ ~Why do you need to specify the netmask or prefix-length of the ~network? You ~are already specifying the IP range. ~ ~The NAT function should not need to know the netmask of the ~network. The ~address range does not appear in the forwarding table so it ~does not seem to ~be used for routing. ~ ~Paul Borghese ~ ~ ~ ~ ~Report misconduct ~and Nondisclosure violations to [EMAIL PROTECTED] ~ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=37820&t=37815 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
