I.R.I.S. DC1100 - Manual (Page 43)

Coaxial Networks, Inc. Page 43 of 60
Application Notes
Network traffic between cable clients
By default IRIS does not allow traffic between CPEs behind cable modems on the same IRIS. To
enable this you have to turn the “NetLoopbackMode” setting in iris.txt file to “1”.
Edit the “iris.txt” file from the system prompt and then change the above seeting to
NetLoopbackMode = 1
Save the file and restart IRIS.
Allowing PPPoE traffic across IRIS
By default IRIS is configured to forward Ethernet packets of IP protocol type only. If you wish to
offer PPPoE services to your customers, you have to configure IRIS so that PPPoE protocol is
forwarded across IRIS. This configuration applies if you are operating IRIS in bridge mode.
Edit the “iris.txt” file from the system prompt and then under the
“BEGIN_NetProtocolType“ section add the following lines which specify the PPPoE
Ethernet packet type
BEGIN_NetProtocolType
TypeField1 = 0x81
TypeField2 = 0
TypeLength = 1
END_NetProtocolType
Make sure you do not remove the default forwading for IP Ethernet packet types.
BEGIN_NetProtocolType
TypeField1 = 8 // default = 8 (IP)
TypeField2 = 0 // default = 0 (ALL)
TypeLength = 1 // default = 1
END_NetProtocolType
Save the file and restart IRIS.
Static IP Mapping
When IRIS is operating in Router mode, some ISPs will like to reserve a publicly routable IP
address for a specific CPE behind the Network Address translation. Using this feature IRIS will
then create a one to one mapping between the public IP address and the private IP address. This
feature of NAT is called BIMAP.