Chapter 6 Broadband
SBG3500-N Series User’s Guide
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6.7.2.2 What Can Go Wrong?
• There can only be one WAN connection configured as passive mode at a time. If there is already
a WAN connection configured as passive mode, you will not be able to add or edit another WAN
connection in passive mode until the aforementioned WAN connection is changed to active mode
or deleted.
• The SBG3500-N Series will automatically add newly created WAN connections (from the
Network Setting > Broadband > Broadband screen) to the multi-WAN configuration as active
mode with a weight of 1. If you are creating a new WAN connection for other purposes (such as
exclusive VPN use), you will need to delete that WAN connection from the multi-WAN
configuration. Deleting a WAN connection from the multi-WAN screen does not delete the WAN
connection from the Broadband page.
• A WAN connection can only be listed once in the multi-WAN configuration table. If you are trying
to add a new entry but do not see the desired WAN connection in the Interface drop-down list,
it is probably already in the multi-WAN configuration. The Interface drop-down list in the Add/
Edit screen only includes WAN connections which currently exist on the SBG3500-N Series but
are not currently configured in multi-WAN.
6.8 Technical Reference
The following section contains additional technical information about the SBG3500-N Series
features described in this chapter.
Encapsulation
Be sure to use the encapsulation method required by your ISP. The SBG3500-N Series can work in
bridge mode or routing mode. When the SBG3500-N Series is in routing mode, it supports the
following methods.
IP over Ethernet
IP over Ethernet (IPoE) is an alternative to PPPoE. IP packets are being delivered across an
Ethernet network, without using PPP encapsulation. They are routed between the Ethernet interface
and the WAN interface and then formatted so that they can be understood in a bridged
environment. For instance, it encapsulates routed Ethernet frames into bridged Ethernet cells.
PPP over ATM (PPPoA)
PPPoA stands for Point to Point Protocol over ATM Adaptation Layer 5 (AAL5). A PPPoA connection
functions like a dial-up Internet connection. The SBG3500-N Series encapsulates the PPP session
based on RFC1483 and sends it through an ATM PVC (Permanent Virtual Circuit) to the Internet
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