Multiple Network Address Translation 3-29
NAT Options | |
IP Passthrough Enabled: | Yes |
IP Passthrough DHCP Enabled: | Yes |
IP Passthrough DHCP MAC address: | 00-00-00-00-00-00 |
Enter MAC addr. of IP passthrough host, or zeroes for first come first serve.
Toggling IP Passthrough DHCP Enabled to Yes displays the IP Passthrough DHCP MAC address field. This is an editable field in which you can enter the MAC (hardware) address of the designated PC be used as the DHCP Client Identifier for dynamic address reservation. The MAC address must be six colon-delimited or dash-delimited sets of hex digits ('0' – 'FF').
First Come First Serve Mode
Netopia Firmware Version 8.4 IP Passthrough allows a first come first serve mode.
NAT Options defaults to an all-zeroes MAC address.
If you leave the default all-zeroes MAC address, the Router will select the next DHCP client that initiates a DHCP lease request or renewal to be the IP passthrough host. When the WAN comes up, or if it is already up, the Router will serve this client the IP passthrough/WAN address. When this client's lease ends, the IP passthrough address becomes available for the next client to initiate a DHCP transaction. The next client will get the IP passthrough address. Note that there is no way to control which PC has the IP passthrough address without releasing all other DHCP leases on the LAN.
Note: If you specify a non-zeroes MAC address, the DHCP Client Identifier must be in the format specified above. Macintosh computers allow the DHCP Client Identifier to be entered as a name or text, however Netopia routers accept only strict (binary/hex) MAC address format. Macintosh computers display their strict MAC addresses in the TCP/IP Control Panel (Classic MacOS) or the Network Preference Pane of System Preferences (Mac OS X).
Once configured, the passthrough host's DHCP leases will be shortened to two minutes. This allows for timely updates of the host's IP address, which will be a private IP address before the WAN connection is established. After the WAN connection is established and has an address, the passthrough host can renew its DHCP address binding to acquire the WAN IP address.
