why the name is not 'ppp1' ?

Hello everyone:
my system is RH7.3+2.4.20, and I setup the ifcfg-ppp1 as follow:
USERCTL=yes
BOOTPROTO=dialup
NAME=DSLppp1
DEVICE=ppp1
TYPE=xDSL
ONBOOT=no
PIDFILE=/var/run/pppoe-adsl-1.pid
FIREWALL=NONE
PING=.
PPPOE_TIMEOUT=0
LCP_FAILURE=5
LCP_INTERVAL=120
CLAMPMSS=1412
CONNECT_POLL=6
CONNECT_TIMEOUT=0
DEFROUTE=yes
SYNCHRONOUS=no
ETH=eth1
PROVIDER=DSLppp1
USER= [email protected]
PEERDNS=no
and I uses the command ifup ppp1 to dail up to the Internet...
It can run but  the ip addr ls is : (I hope it is ppp1)
ppp0      Link encap:Point-to-Point Protocol
          inet addr:228.117.27.12  P-t-P:218.117.32.254
Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1

the dev name is currect or not?
If I want the eth0 map ppp0 and eth1 map ppp1, where I should config?


Thanks and Best Regards