8
AdvertType
This value specifies the type of datagram the Mobile Agent will use when sending out ICMP Agent
Advertisements. The RFC 1256 recommendation and the default for the Access Point is to use the All
Hosts Multicast address (224.0.0.1). In testing, it was discovered that some mobile nodes were not
automatically joining this multicast group and thus were ignoring the agent advertisements. For these
mobile nodes this value should be changed to ‘broadcast’ which will use the limited broadcast address
(255.255.255.255) for all unsolicited agent advertisements.
AdvertInterval
This value specifies how frequently (in seconds) the Mobile Agent will send out an ICMP Router
Advertisement multicast. These advertisements are used by the Mobile Nodes to locate the Mobile Agents,
and to determine to which network they are currently attached. The more frequent the advertisement, the
sooner the Mobile Node will be aware that it has attached to a new network and start the registration/de-
registration process (if necessary). Since these are either multicast or broadcast datagrams (see below), the
Access Point must be configured to forward these types of frames onto the RF network. We are currently
working on a scheme to allow link layer notification of re-attachment resulting in a Router Solicitation
from the Mobile Node. This will prompt a unicasted Router Advertisement from the Mobile Agent to the
Mobile Node and allow multicast/broadcast forwarding on the Access Point to be turned off.
PrefixLen
This option allows the Prefix Length extension to the Mobility Agent (router) advertisement to be enabled
or disabled. This extension is used to indicate the number of bits in the subnet mask for the Mobility Agent
generating the advertisement. The presence of the Prefix Length extension may be helpful to some Mobile
Nodes in determining if they have attached to a foreign network. The default value is off. (note: should be
on for FTP TSR stacks, off
for VxD stacks)
AdvertRtrs
RFC 2002 (Mobile IP) states that IP Routers MAY be included in the Router Advertisement (RFC 1256)
portion of the Agent Advertisement. However, since the IP Address of the Agent itself is included in the
router list, doing so may cause some hosts to select the Mobility Agent as its default router. In an attempt
to minimize this situation, the Mobile Agent also includes the IP Address of its default router in the list of
advertised routers with a higher “preference” value. If a host continues to select a Mobility Agent as it
default router, the Agent can be configure to advertise zero routes by setting this value to off. The default
value is on.
Utilizing the Time Menu-
Aironet Access Point V7.05 Configuration Time Menu APXXXX_1419d8
Option Value Description
1 - Time_server [ 000.000.000.000 ] - Time protocol server
2 - Sntp_server [ 000.000.000.000 ] - Network time server
3 - Offset [ 0 ] - GMT offset in minutes
4 - Dst [ off ] - Use daylight savings time
Enter an option number or name, "=" main menu, <ESC> previous menu
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