LANCOM 1751 UMTS
Chapter 8: Setting up the UMTS profile
61
EN
If the UMTS/HSxPA card was assigned a private IP address and the
LANCOM UMTS Router cannot, for example, be identified by an ISDN call
(Dynamic VPN), the VPN connection must always be established from the
VPN gateway with the UMTS/HSxPA card in the direction of the VPN gate-
way at the headquarters.
To ensure that the VPN connection with the network at the headquarters
is available on a continuous basis, set both the hold time for the Internet
connection and the VPN hold time to '9,999' (keep alive). This is the only
way to ensure that access from the headquarters to the UMTS/HSxPA-con-
nected network is possible at all times (e.g. for connecting branches via
UMTS/HSxPA where no broadband Internet access is available).
If line polling is to be used to monitor the VPN connection, then it also has
to be initiated from the VPN gateway with the UMTS/HSxPA card and must
be directed towards the remote VPN gateway. The interval times for the
polling calls may have to be adjusted depending on the quality of the con-
nection.
Depending on the tariff, always-on Internet connections can give rise
to considerable costs, for example with time-based charging. Please
ensure that you are familiar with the details of your mobile provider's
UMTS/HSxPA tariff.
8.3
Other settings
8.3.1
Choosing the mobile telephone network
Most mobile data cards are programmed to log in to their own network when
coverage is available, and there is no free choice of network.
Once the card is outside of "home network" coverage, there is normally a
choice of alternative mobile networks (i.e. roaming, in particular when in ano-
ther country). Generally speaking, the user now has a choice of network which
is to be used for the Internet connection.
In the appropriate UMTS/HSxPA/GPRS profile, set the option for network
selection to 'manual'. The entry for the name of the desired network should
be the same as that identified by the data card's scanning procedure.
110584_LC-1751-UMTS-MANUAL-EN.book Page 61 Tuesday, February 26, 2008 5:16 PM
