The manual that came w/ my DSL modem (which has an Alcatel chipset)
gave no refrences to it
having any IP capabilities at all: just have
your PC speak PPPoE and the modem will
handle the rest
. After spending enough time
on the phone w/ tech
support they admited to me that the modem does
in fact have an IP address.
My modem's default IP was 10.0.0.1/24. After
configuring my ethernet
interface connected to the modem to have an address
on that network I was able to ping the modem,
telnet into the modem
to view/change configuration information,
and use SNMP to
poll stats the modem.
When my modem fails it generally
goes to a "dsl-down ethernet-down"
condition that I can detect by
pinging the modem (if the modem
is up and the internet is down,
I can detect that by SNMP poling the modem
and/or pinging the "internet").
Poke around and you'll probably find out
that your modem does actually have an IP support and
an IP address
that you can ping. The manufacturer is probably
just hiding this from you.