pppd problem

I use "unit 0" in /etc/ppp/peers/dsl-provider to force the dsl connection on ppp0.

But it gets ignored and the ppp deamon so I get problems with a unstable link.

1. I have a connection...

Sep 10 01:56:23 proxy02 pppd[13195]: PPP session is 9930
Sep 10 01:56:23 proxy02 pppd[13195]: Connected to 00:30:88:1f:17:19 via interface eth1
Sep 10 01:56:23 proxy02 pppd[13195]: Using interface ppp0
Sep 10 01:56:23 proxy02 pppd[13195]: Connect: ppp0 <--> eth1
Sep 10 01:56:23 proxy02 pppd[13195]: Remote message: 0030 PSBER003 2620633872 session limit exceeded
Sep 10 01:56:23 proxy02 pppd[13195]: PAP authentication failed
Sep 10 01:56:29 proxy02 pppd[13195]: Connection terminated.
Sep 10 01:56:29 proxy02 pppd[13195]: Modem hangup
Sep 10 01:56:59 proxy02 pppd[13195]: PPP session is 11582
Sep 10 01:56:59 proxy02 pppd[13195]: Connected to 00:30:88:1f:17:19 via interface eth1
Sep 10 01:56:59 proxy02 pppd[13195]: Using interface ppp0
Sep 10 01:56:59 proxy02 pppd[13195]: Connect: ppp0 <--> eth1
Sep 10 01:56:59 proxy02 pppd[13195]: PAP authentication succeeded
Sep 10 01:56:59 proxy02 pppd[13195]: peer from calling number 00:30:88:1F:17:19 authorized
Sep 10 01:57:00 proxy02 pppd[13195]: not replacing existing default route through ppp1
Sep 10 01:57:00 proxy02 pppd[13195]: local IP address 84.170.XXX.XXX
Sep 10 01:57:00 proxy02 pppd[13195]: remote IP address 87.186.XXX.XXX
Sep 10 01:57:00 proxy02 pppd[13195]: primary DNS address 217.0.43.97
Sep 10 01:57:00 proxy02 pppd[13195]: secondary DNS address 217.0.43.113

Than when the DSL Connection get a error, the pppd create a new connection with ppp1, but ppp0 is still connected and we get a "session limit exceeded".

Sep 10 01:57:15 proxy02 pppd[13114]: No response to 4 echo-requests
Sep 10 01:57:15 proxy02 pppd[13114]: Serial link appears to be disconnected.
Sep 10 01:57:15 proxy02 pppd[13114]: Connect time 3.0 minutes.
Sep 10 01:57:15 proxy02 pppd[13114]: Sent 15438 bytes, received 21041 bytes.
Sep 10 01:57:21 proxy02 pppd[13114]: Connection terminated.
Sep 10 01:57:21 proxy02 pppd[13114]: Modem hangup
Sep 10 01:57:52 proxy02 pppd[13114]: PPP session is 5314
Sep 10 01:57:52 proxy02 pppd[13114]: Connected to 00:30:88:1f:17:19 via interface eth1
Sep 10 01:57:52 proxy02 pppd[13114]: Couldn't allocate PPP unit 0 as it is already in use
Sep 10 01:57:52 proxy02 pppd[13114]: Using interface ppp1
Sep 10 01:57:52 proxy02 pppd[13114]: Connect: ppp1 <--> eth1
Sep 10 01:57:52 proxy02 pppd[13114]: Remote message: 0030 PSBER003 2620673003 session limit exceeded
Sep 10 01:57:52 proxy02 pppd[13114]: PAP authentication failed
Sep 10 01:57:58 proxy02 pppd[13114]: Connection terminated.
Sep 10 01:57:58 proxy02 pppd[13114]: Modem hangup

Its like there a two pppd daemons running... this daemons fight each other, than later the Internet connection fails because of

Sep 10 01:51:32 proxy02 pppd[13195]: PPP session is 2061
Sep 10 01:51:32 proxy02 pppd[13195]: Connected to 00:30:88:1f:17:19 via interface eth1
Sep 10 01:51:32 proxy02 pppd[13195]: Using interface ppp0
Sep 10 01:51:32 proxy02 pppd[13195]: Connect: ppp0 <--> eth1
Sep 10 01:51:33 proxy02 pppd[13195]: PAP authentication succeeded
Sep 10 01:51:33 proxy02 pppd[13195]: peer from calling number 00:30:88:1F:17:19 authorized
Sep 10 01:51:33 proxy02 pppd[13195]: not replacing existing default route through ppp1

Than the default route is wrong :(

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ppp 2.4.5-5ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-53.81-generic-pae 3.2.50
Uname: Linux 3.2.0-53-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: i386
Date: Tue Sep 10 15:59:15 2013
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release i386 (20120424.1)
MarkForUpload: True
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: ppp
UpgradeStatus: No upgrade log present (probably fresh install)