2004-07-12 11:36:25 +08:00
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OPENWRT PPPOECD NOTES
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=====================
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1. GENERAL
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----------
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This package is used to estabilish basic connection to the
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Internet via DSL/ADSL modems. This is also known as the
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PPPoE or PPP-over-Ethernet connection.
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The PPPOECD program included in the OpenWrt distribution is a
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modified version of the PPPOECD that is present in the original
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Linksys firmware.
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This modified version is directly supported by the OpenWrt
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startup scripts.
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2. BUILDING
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-----------
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If you have a pre-compiled PPPOECD package, skip this section.
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PPPOECD can be built in two ways. As an integrated part
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of the OpenWrt FLASH image or as an .ipk package that can
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be installed separately.
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To build PPPOECD as an embedded component, add "pppoecd" to the
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TARGETS variable in the main OpenWrt Makefile before the
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"openwrt-bin" value.
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To build as a standalone package, add "pppoecd" to the
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PACKAGES variable in the main OpenWrt Makefile.
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3. NVRAM variables
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------------------
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In order for the PPPoE link to be established by the networking
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scripts the following NVRAM variables must be present:
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wan_ifname Should be set to: ppp0
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wan_proto Should be set to: pppoe
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pppoe_ifname Set it to the WAN interface on which the PPPoE
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is to function. On a 2.0 or a GS model it is
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usually vlan1. The 1.0 and 1.1 models used vlan2.
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ppp_username User name for your PPPoE connection.
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ppp_passwd Password for the connection.
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ppp_redialperiod Time between reconnect attempts.
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Usualy set to 30.
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ppp_idletime Time the link has to stay dead before reconnecting.
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Usually set to 5.
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wan_mtu The Maxumum Transfer Unit for the PPPoE connection.
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Typically 1492.
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Please consult the OpenWrt WIKI or the forum for more
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information on NVRAM variables.
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4. STARTUP / SHUTDOWN
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---------------------
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OpenWrt will attempt to connect using PPPOECD when starting up.
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The script responsible for that is /etc/init.d/S40network.
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You can also manually start the PPPOECD by doing:
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2004-07-13 10:52:21 +08:00
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ifup wan
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2004-07-12 11:36:25 +08:00
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Similarly you can shutdown the PPPOECD by doing:
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2004-07-13 10:52:21 +08:00
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ifdown wan
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2004-07-12 11:36:25 +08:00
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5. CONFIGURATION
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----------------
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PPPoE firewall configuration is the standard OpenWrt configuration
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in /etc/init.d/S45firewall that applies to all the other types
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of connections to the Internet.
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Additional actions can be performed when connecting or disconnecting
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by modifying "ip-up" and "ip-down" scripts in the /etc/ppp directory.
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When connecting, PPPOECD creates /tmp/resolv.conf file that contains
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DNS server entries as supplied by the ISP. The standard ip-up
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script will also add a default route leading via the PPPoE link.
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6. DIFFERENCES FROM THE ORIGINAL PPPOECD
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----------------------------------------
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The main difference is the location of files. Original Linksys
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PPPOECD operated almost exclusively in the /tmp/ppp directory. This
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however prevents any persistent configuration of the program via
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ip-up or ip-down scripts. Also the program itself was located in
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/usr/sbin whereas OpenWrt scripts expect it to be in /sbin directory.
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