adsl with redhat-7.1

[Wolfgang Leideck <w leideck leisoft de>]

Hello.
I have installed redhat-7.1 and have also configured adsl. 
If i want connect to the internet using ping for example, i must
wait a very long time until ping stops without success.
This is what /var/log/messages says:

Jul  2 17:22:41 xpert pppd[1059]: Starting link
Jul  2 17:22:41 xpert pppd[1059]: Serial connection established.
Jul  2 17:22:41 xpert pppd[1059]: Connect: ppp0 <--> /dev/pts/1
Jul  2 17:23:12 xpert pppd[1059]: LCP: timeout sending Config-Requ
Jul  2 17:23:12 xpert pppd[1059]: Connection terminated.
Jul  2 17:23:16 xpert pppoe[1480]: Timeout waiting for PADO packet


After some tries with restarting the network and adsl link 'ping'
succeed after a long waiting time. This is what /var/log/messages 
says:
Jul  2 18:09:51 xpert pppd[3072]: pppd 2.4.0 started by root, uid 0
Jul  2 18:09:51 xpert pppd[3072]: Using interface ppp0
Jul  2 18:09:51 xpert pppd[3072]: local  IP address 10.112.112.112
Jul  2 18:09:51 xpert pppd[3072]: remote IP address 10.112.112.113
Jul  2 18:10:05 xpert pppd[3072]: Starting link
Jul  2 18:10:05 xpert pppd[3072]: Serial connection established.
Jul  2 18:10:05 xpert pppd[3072]: Connect: ppp0 <--> /dev/pts/1
Jul  2 18:10:05 xpert pppoe[3092]: PPP session is 6686
Jul  2 18:10:11 xpert pppd[3072]: Local IP address changed to
217.85.215.184
Jul  2 18:10:11 xpert pppd[3072]: Remote IP address changed to
217.5.98.42

The configuration is like that

/etc/ppp/options:
lock

/etc/ppp/pppoe-server-options:
require-pap

/etc/ppp/pppoe.conf:
DEVICE="ppp0"
BOOT="yes"
ETH="eth0"
USER="xxxxxxxxxxxx"
PASS="xxxxxxxxxx"
DEMAND="0"
USEPEERDNS="no"
DNS1="194.25.2.129"
CONNECT_TIMEOUT="0"
CONNECT_POLL="6"
PING="."
SYNCHRONOUS="no"
CLAMPMSS="1412"
LCP_INTERVAL="20"
LCP_FAILURE="3"
PPPOE_TIMEOUT="80"
FIREWALL="NONE"
PPPOE_EXTRA=""
CF_BASE=`basename $CONFIG`
PIDFILE="/var/run/$CF_BASE-adsl.pid"


What's wrong with this configuration?