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4.5 SECURITY
Internet
provider
Phone line
ADSL/ ISDN
Wireless LAN
Access Point
Laptops equippedwith
the Nokia D211 radio card
VPN client installed
Laptops equippedwith
the Nokia D211 radio card
VPN client installed
Secure Home
Remote GPRS
remote
Figure 6: Secure remote access architecture
4.5.1 WEP keys
Wireless LAN offers basic protection in terms of WEP (Wired Equivalent Privacy). The Nokia
D211 supports three key lengths: 40 (40+24), 128 (104+24), and 152 (128+24) bits.
Tip: Regardless of how the WEP keys have been named, all keys are compatible
as long as their length is the same. For example, keys that are 40 bits long,
always consist of 5 alphanumeric characters or 10 hexadecimal characters.
The 40-bit key is Wi-Fiä (Wireless Fidelity) compatible.
Shared keys are specified in an access point and in a WLAN client. In other words, all WLAN
clients are using the same WEP key in the same network.
Personal WEP keys are a Nokia proprietary solution for enhanced security. Personal WEP
keys are stored in an access point or an access point can get users WEP keys from a
RADIUS server. In the case of personal WEP keys, all users have different WEP keys.
Please see the Nokia D211 User's Guide for further details.
Office WLAN
Laptops equippedwith
the Nokia D211 radio card
VPN client installed
VPN server / Firewall
Internet
GPRS
operator
Corporate
Corporate
Authentication
server
DHCP server
Remote
Access
Server
WLAN
operator
Laptops equippedwith
the Nokia D211 radio card
VPN client installed
Remote WLAN
Application servers
(email, databases etc.)
Telephony
network
(PSTN)
GSM
(HSCSD)
operator
Laptops equippedwith
the Nokia D211 radio card
Remote GSM
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