Operation - Nortel Remote Gateway 9110 Release Note

June 2005

Operation

This section provides important information about the operation of the Remote
Gateway 9100 Series units.
Classless Inter-Domain Routing (CIDR) capability
The Remote Gateway 9100 Series family of products does not support Classless
Inter-Domain Routing (CIDR), also called supernetting. A CIDR example is a
Class C IP Address with a Class B IP Network Mask as follows:
RLC - Class C IP Address 192.168.1.1 with a Class B IP Network Mask
255.255.0.0
9150 - Class C IP Address 192.168.1.1 with a Class B IP Network Mask
255.255.0.0
ICMP re-directs result in the RLC and Remote Gateway 9150 unit
losing connectivity
Internet Control Message Protocol (ICMP) re-directs are not supported by the
Remote Gateway 9100 Series family of products when the IP Network Mask
sent does not adhere to the current IP Network Mask configured in Remote
Gateway 9100 Seriess Configuration Manager. An ICMP re-direct, which is a
classless message (no mask identified), sent to a Remote Gateway 9100 Series
unit creates a routing table entry within the product that is based on the inherent
IP class mask not the configured class map.
For example, a Remote Gateway 9100 Series unit configured with a Class A IP
address and a Class B IP Network Mask that is sent an ICMP re-direct which
provides a Class A IP address entry, causes all traffic in the Class A scope to be
re-directed to the new path.
Nortel recommends that you only install the Remote Gateway 9100 Series
family of products with one gateway on the subnet.
1.6.0 Release Notes for Remote Gateway 9100 Series and RLC 15