ADSL cannot dial ("0.0.0.0/0 already exist)

[Zhang Weiwu]

Hello. 

I just brought an ADSL modem (Alcatel Homeplus 501). This modem is 
pre-configured
I used FreeBSD several years, but this is the first time I use ppp:
. 
My /etc/ppp/ppp.conf is:

------
default:
  set log Phase tun command # you can add more detailed logging if you wish
  set ifaddr 10.0.0.1/0 10.0.0.138/0

cncom:
  set device PPPoE:ed0
  set authname LOGINNAME
  set authkey PASSWORD
  set dial
  set login
  add default 10.0.0.138
-------

The modem is 10.0.0.138, it assigned me the address 10.0.0.1.
Ping 10.0.0.138 has response.

To dial with "ppp -ddial cncom" I get the error message:
   0.0.0.0/0 already exist.

So what should I do now?

I'm running FreeBSD 4.9 RC3.

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