27.4. 在乙太網路使用 PPP (PPPoE)
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## 27.4. 在乙太網路使用 PPP (PPPoE)

This section describes how to set up PPP over Ethernet (PPPoE).

Here is an example of a working `ppp.conf`:

    default:
      set log Phase tun command # you can add more detailed logging if you wish
      set ifaddr 10.0.0.1/0 10.0.0.2/0

    name_of_service_provider:
      set device PPPoE:xl1 # replace xl1 with your Ethernet device
      set authname YOURLOGINNAME
      set authkey YOURPASSWORD
      set dial
      set login
      add default HISADDR

As `root`, run:

    # ppp -ddial name_of_service_provider

Add the following to `/etc/rc.conf`:

    ppp_enable="YES"
    ppp_mode="ddial"
    ppp_nat="YES"	# if you want to enable nat for your local network, otherwise NO
    ppp_profile="name_of_service_provider"

### 27.4.1. 使用 PPPoE 服務標籤

Sometimes it will be necessary to use a service tag to establish the connection. Service tags are used to distinguish between different PPPoE servers attached to a given network.

Any required service tag information should be in the documentation provided by the ISP.

As a last resort, one could try installing the net/rr-pppoe package or port. Bear in mind however, this may de-program your modem and render it useless, so think twice before doing it. Simply install the program shipped with the modem. Then, access the System menu from the program. The name of the profile should be listed there. It is usually ISP.

The profile name (service tag) will be used in the PPPoE configuration entry in `ppp.conf` as the provider part for `set device`. Refer to ppp(8) for full details. It should look like this:

    set device PPPoE:xl1:ISP

Do not forget to change `xl1` to the proper device for the Ethernet card.

Do not forget to change `ISP` to the profile.

For additional information, refer to Cheaper Broadband with FreeBSD on DSL by Renaud Waldura.

### 27.4.2. 在 3Com® HomeConnect® ADSL Modem Dual Link 使用 PPPoE

This modem does not follow the PPPoE specification defined in RFC 2516.

In order to make FreeBSD capable of communicating with this device, a sysctl must be set. This can be done automatically at boot time by updating `/etc/sysctl.conf`:

    net.graph.nonstandard_pppoe=1

or can be done immediately with the command:

    # sysctl net.graph.nonstandard_pppoe=1

Unfortunately, because this is a system-wide setting, it is not possible to talk to a normal PPPoE client or server and a 3Com® HomeConnect® ADSL Modem at the same time.

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