FireBrick FB6602, Руководство пользователя

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Chapter 10. PPPoE
The FB6000 can operate as a PPPoE client. This is typically used to connect to an Internet service provider,
either via a suitable PPPoE modem, bridging router, or direct connection.
The typical usage is to use one or more ports on the FB6000 each connected directly to a suitable PPPoE device
such as a bridging router.
The PPPoE device is usually very dumb and may not need any configuration at all. The FireBrick is responsible
for the login to the ISP using the PPPoE link, and the configuration for this is part of the FB6000's configuration
and not the router. This makes it very easy to make use of spare routers, etc, without the complication of
configuring additional devices.
It is possible to connect more than one PPP device to a single FB6000 port using an Ethernet switch. If you do
this then you ideally need a switch that handles VLANs (see Appendix D if you are not familiar with VLANs)
so that each router can be logically connected to a different interface on the FireBrick. It is also a good idea to
have a switch that supports jumbo frames if using FTTC or FTTP services in this way.
Note
This section contains information relating to access network services (such as DSL and Fibre-To-The-
Cabinet) available in the United Kingdom. Although this information will not be directly applicable
to services available in other countries, the concepts are the same - with appropriate knowledge of
your ISP service, and suitable equipment, the FB6000 should work equally well with services that are
available in other countries.
10.1. Types of DSL line and router in the
United Kingdom
In the UK there are various types of DSL line and router than can be used. Any device that supports PPPoE
can work with the FireBrick, but some options are only available with some devices, as listed below :-
• BT 20CN or 21CN lines can support PPPoE and PPPoA on the wire. This means you can use them with a
PPPoE/A modem (such as a Vigor V-120) out of the box, or with a bridging router such as the Zyxel P660
configured in bridge mode.
• Be PPPoE lines only support PPPoE. This means you have to use a bridging router or other device that
handles PPPoE on the wire and not a PPPoE/A modem.
• Be PPPoA lines only support PPPoA. This means you have to use a PPPoE/A modem, and not a bridging
router.
• BT FTTC lines come with a VDSL modem which supports PPPoE directly so no extra equipment is needed
to connect to the FireBrick.
• BT FTTP lines terminate on an active NTE which supports PPPoE directly so no extra equipment is needed
to connect to the FireBrick.
For other types of lines in the UK, or those in other countries, you need to know what they can do on the wire
(PPPoA or PPPoE) and have a suitable modem/router to talk that protocol and convert to PPPoE on the LAN
link to the FB6000. It seems most DSL routers will bridge PPPoE on the wire to PPPoE on the LAN, but few
will act as a PPPoE access concentrator. The Vigor V-120 is one of the few that handle PPPoA on the wire
and PPPoE link to the FB6000.
A significant benefit of the Vigor V-120 is that it works with no configuration on BT 20CN and 21CN lines as
well as Be PPPoA lines - you just plug it in to the line and the FB6000 and it just works.