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3 — Configuring Your Router
3-11
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v)
Configuring the WAN - For RFC 2516 PPPoE
a) To set the IP configuration of your WAN connection. The PPP module
supports multiple simultaneously connections, so we explicitly specify
Device
1
here. The MTU (Maximum Transmit Unit) size for PPPoE must
also be specified as being
1492
:
ip device add ppp_device ether //ppp/DEVICE=
1
mtu 1492
b) To configure PPP device
1
, assuming the PVC given by your ADSL Service
Provider is
0/35
.
ppp
1
pppoe
0 35
c) CHAP authentication is used in this example. Replace CHAP with PAP
if you are using PAP authentication. ADSL Service Provider will supply
the
myuserid
and
mypassword
.
ppp
1
welogin
myuserid
mypassword
chap
ppp
1
gateway local
ppp
1
enable
d) To check the PPP connection every 10 seconds. (This is to allow the PPP
session to automatically re-establish itself after an ADSL link disruption
and re-connection.):
ppp
1
echo every 10
e) If you do not want to enable NAT, you
may
enable the
PPP IP Unnumbered
feature
(availability will depend on your router package). PPP IP
Unnumbered allows you to enable IP processing on a serial interface
without assigning it an explicit IP address. The ip unnumbered interface
can 'borrow' the IP address of another interface that is already configured
on the router, thereby conserving network and address space.
(Assuming your LAN Subnet mask is
ff:ff:ff:f8
.)
ppp
1
disable
ppp
1
unnumbered enable
ppp
1
lansubnet
ff:ff:ff:f8
ppp
1
enable
config save
When the PPP link is established, you will notice that your LAN IP address
actually changes to the address of the WAN IP obtained from the PPP
Server. Your WAN IP address now becomes 0.0.0.1, a dummy IP address.
To maintain IP connectivity to the router's LAN Port before and after
establishing the PPP unnumbered link, you are advised to pre-configure
the LAN IP to that of the given WAN IP. (You may refer to
section 3.3.2,
Step 2
- Configuring the LAN
.)
