IP Router Configuration
Configuring
ip-global
network features
Stinger®
IP2000 Configuration Guide
4-19
send the Stinger unit a packet for an inactive IP address. If that occurs, the packets
are routed to the Reject (
rj0
) interface (127.0.0.2). Packets routed to the Reject
interface are bounced back to the sender with an
ICMP unreachable
message.
Examples of assigning an address from a pool
When an incoming call requests an IP address, the Stinger unit assigns one from a
pool. A host requests an address if its client software has settings such as those shown
in Figure 4-1:
Figure 4-1. Client software settings requesting dynamic address assignment
Figure 4-2 shows a remote host requesting and being assigned an IP address.
Figure 4-2. Remote CPE requiring assigned IP address
The following commands enable dynamic address assignment systemwide:
admin> read answer-defaults
admin> set ip-answer assign-address = yes
admin> write -f
During PPP negotiation, a CPE can reject an IP address offered by the router and
present the caller’s own IP address for consideration. For security purposes, many
sites set
must-accept-address-assign
to
yes
to ensure that the Stinger unit
terminates such a call, as shown in the following example:
admin> read ip-global
admin> set must-accept-address-assign = yes
admin> write -f
For address assignment to occur, the Stinger unit must have an address available for
assignment, the
answer-defaults
profile must enable dynamic assignment, the client
profile must specify dynamic assignment, and the client’s PPP software must be
configured to acquire its IP address dynamically.
Username=victor
Accept Assigned IP=Yes
IP address=Dynamic (or Assigned or N/A)
Netmask=255.255.255.255 (or None or N/A)
Default Gateway=None or N/A
Name Server=10.2.3.55
Domain suffix=abc.com
Baud rate=38400
Hardware handshaking ON
VAN Jacobson compression ON
Network side
User side
IP
Stinger IP2000
Stinger IP2000
10.2.3.1/24
GigE interface
Address request
10.2.3.128/32
