Review: Agere ORiNOCO AS-2000, part 2 - Page 2

By Lisa Phifer | Posted Sep 6, 2001
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Dynamic Address Assignment
The AS-2000 can be used in IP and IPX networks. Tech support runs into IPX infrequently, mostly at universities. We limited our testing to IP, and configured PPP parameters to exercise four methods of IP address assignment:

Click for full sized image 1)   In the simplest case, IP addresses are assigned from a local pool. (Click on image at right to enlarge.) The AS-2000 uses PPP IPCP to return the AS Client an unused address from this pool, along with DNS and WINS addresses (both required). The AS-2000 is a bridge, so addresses come from the same subnet as the AS-2000's Ethernet.

Click for full sized image 2)   Alternatively, IP addresses can be statically bound to specific MAC addresses. (Click on image at leftt to enlarge.) If the source NIC's MAC address appears in this table, the mapped IP is returned to the AS Client. Otherwise, an address can still be returned from the local poolthis table is not a MAC ACL.

Click for full sized image 3)   We also tested DHCP address assignment using a new 2.02.1 beta image. (Click on image at right to enlarge.) We let a DHCP server on the same LAN assign IP addresses. This beta also supports BOOTP/DHCP relay, acting as a DHCP proxy. When using DHCP assignment, beware that these values over-ride any assignments returned by RADIUS. Currently, there are no counters for DHCP, making problems hard to spot.

4)   Finally, a RADIUS server can be configured to supply IP addresses when accepting an Access Request. On the AS-2000, select RADIUS as the IP address assignment type and configure RADIUS parameters (discussed in the next section). Actual address assignments are configured on the RADIUS serverif RADIUS does not return an IP address, PPP session establishment fails.

PPP parameters also determine session idle timeout (disable if you want session timeout controlled by RADIUS) and the authentication protocol used between the AS-2000 and your RADIUS server (PAP or CHAP).

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