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Coaxial Networks, Inc. Page 44 of 60
To create a BIMAP you will need to know the MAC address of the CPE. To obtain this you can
Telnet to IRIS and issue the "pcpe" command find the cable modem that the end user has,
attached you will see his CPE Mac address.
Assigning a reserved IP address to the CPE.
Edit the /etc/dhcpd.conf file and add a "host" entry for the MAC address of the CPE with a
Reserved IP address in the "#CPE Network" subnet
host user1 {
hardware ethernet 00:12:17:4C:9b:21;
fixed-address 10.71.0.2 ;
}
Save the file and restart the DHCP server using the following commands
# slay -f dhcpd <ENTER>
# dhcpd en1 <ENTER>
Assigning additional IP addresses to the uplink Interface
From system prompt edit the "netstart.user" file and add the following line
/usr/ucb/ifconfig en2 alias <ip-address> netmask <netmask>
Make sure you put the <ip-address> and <netmask> that you have from your service
provider.
This command will configure IRIS "en2" or uplink interface with an additional IP address that
will be used to create a BIMAP. Save the file and exit to system prompt.
Creating a BIMAP between the public IP address and the private IP address
From system prompt edit the startnat file and at the end of the line before the
"EOF" command
bimap en2 <internal-ip-address>/32 -> <public-ip-address>/32
Replace <internal-ip-address> with the internal IP address that you have reserved in the
dhcpd.conf file in step 1. Replace <public-ip-address> with the external Ip address that was
assigned to the en2 port in step 2. Save the file and exit to system prompt. Restart the system to
make the changes.