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JUNOSe 11.1.x Broadband Access Configuration Guide
NOTE: If a DHCP client attempts to renew its address and the DHCP server receives
the request on a different interface than the interface that the client originally used,
the DHCP server sends a NAK message to the client, forcing the client to begin the
DHCP connection process again.
Figure 11: Non-PPP Equal Access via the Router
SRC
Standalone Mode Overview
In standalone mode, the DHCP local server operates as a basic DHCP server. Clients
are not authenticated by default; however, you can optionally configure the DHCP
local server to use AAA authentication for the incoming clients. The DHCP local server
receives DHCP client requests for addresses, selects DHCP local pools from which
to allocate addresses, distributes addresses to the clients, and maintains the resulting
DHCP bindings in a server management table.
Local Pool Selection and Address Allocation
In standalone mode, the DHCP local server selects a pool to allocate an address for
a client; the SRC software is never notified or queried. The process used depends on
whether AAA authentication is configured.
472
Standalone Mode Overview
SRC client
Subscriber requests IP address
DHCP server asks SRC software for subscriber information
SRC software gets subscriber information from RADIUS
SRC software gives subscriber information to DHCP
DHCP picks IP address from address pool
DHCP gives IP address to subscriber
Subscriber logs on to SRC application
If AAA authentication is not configured, the DHCP local server selects a pool by
matching the local pool network address to the giaddr or the received interface
IP address. The router compares the parameters with the local DHCP pools in
the order presented in Table 99 on page 473. When the router finds a match, it
selects a pool based on the match and does not examine other parameters.
E Series router
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Troubleshooting
