Connecté à internet ou pas?

Bonjour, j'ai récemment installé Salix Linux, une distribution basée sur Slackware et compatible avec tous ses logiciels, sur mon ordinateur. Cette distribution marche très bien (normal c'est linux), mais je n'ai pas réussi à me connecter à internet (normal aussi selon certains puisque j'ai un sagem f@st 800 EIV en mode pppoa). J'ai installé les firmwares nécessaires, créé le fichier /etc/ppp/peers/ueagle-atm et entré mon mot de passe dans le fichier /etc/ppp/chap-secrets.
Tout marche bien, je suis même censé être connecté à internet mais pas moyen d'aller sur le web avec firefox ni d'installer ou de mettre à jour des logiciels avec slapt-get. Voici les résultats de commandes bien connues:

pppd call ueagle-atm:
Plugin pppoatm.so loaded.
PPPoATM plugin_initPPPoATM
setdevname_pppoatm - SUCCESS:8.35

ifconfig:
lo
Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2008 errors:0 dropped:0 overruns:0 frame:0
TX packets:2008 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:165728 (161.8 KiB)
TX bytes:165728 (161.8 KiB)
ppp0
Link encap:Point-to-Point Protocol
inet addr:**.**.**.** P-t-P:**.**.**.** Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:64 (64.0 B)
TX bytes:97 (97.0 B)

cat /var/log/messages | grep ppp:
Sep 26 17:10:50 darkstar pppd[3362]: Plugin pppoatm.so loaded.
Sep 26 17:10:50 darkstar pppd[3362]: PPPoATM plugin_init
Sep 26 17:10:50 darkstar pppd[3362]: PPPoATM setdevname_pppoatm - SUCCESS:8.35
Sep 26 17:10:50 darkstar pppd[3369]: pppd 2.4.4 started by root, uid 0
Sep 26 17:10:50 darkstar pppd[3369]: Using interface ppp0
Sep 26 17:10:50 darkstar pppd[3369]: Connect: ppp0 <--> 8.35
Sep 26 17:11:08 darkstar pppd[3369]: CHAP authentication succeeded: CHAP authentication success, unit 4063
Sep 26 17:11:08 darkstar pppd[3369]: CHAP authentication succeeded
Sep 26 17:11:09 darkstar pppd[3369]: local IP address **.**.**.**
Sep 26 17:11:09 darkstar pppd[3369]: remote IP address **.**.**.**
Sep 26 17:11:09 darkstar pppd[3369]: primary DNS address **.**.**.**
Sep 26 17:11:09 darkstar pppd[3369]: secondary DNS address **.**.**.**
Sep 26 17:12:20 darkstar ntpd[2931]: Listening on interface #2 ppp0, **.**.**.**#123 Enabled
Sep 26 17:12:26 darkstar pppd[3427]: Plugin pppoatm.so loaded.
Sep 26 17:12:26 darkstar pppd[3427]: PPPoATM plugin_init
Sep 26 17:12:26 darkstar pppd[3427]: PPPoATM setdevname_pppoatm - SUCCESS:8.35
Sep 26 17:12:26 darkstar pppd[3428]: pppd 2.4.4 started by root, uid 0
Sep 26 17:12:27 darkstar pppd[3428]: Exit.
Sep 26 17:14:53 darkstar pppd[3453]: pppd 2.4.4 started by etienne, uid 0
Sep 26 17:14:53 darkstar pppd[3453]: Using interface ppp1
Sep 26 17:14:53 darkstar pppd[3453]: Connect: ppp1 <--> /dev/pts/1
Sep 26 17:15:23 darkstar pppd[3453]: Connection terminated.
Sep 26 17:15:24 darkstar pppd[3453]: Modem hangup
Sep 26 17:15:24 darkstar pppd[3453]: Exit.
Sep 26 17:15:42 darkstar pppd[3369]: Terminating on signal 15
Sep 26 17:15:42 darkstar pppd[3369]: Connect time 4.6 minutes.
Sep 26 17:15:42 darkstar pppd[3369]: Sent 0 bytes, received 0 bytes.
Sep 26 17:15:42 darkstar pppd[3369]: Connection terminated.
Sep 26 17:15:42 darkstar pppd[3369]: Exit.
Sep 26 17:18:20 darkstar ntpd[2931]: Deleting interface #2 ppp0, **.**.**.**#123, interface stats: received=0, sent=0, dropped=0, active_time=360 secs
Sep 26 17:19:45 darkstar pppd[3628]: Plugin pppoatm.so loaded.
Sep 26 17:19:45 darkstar pppd[3628]: PPPoATM plugin_init
Sep 26 17:19:45 darkstar pppd[3628]: PPPoATM setdevname_pppoatm - SUCCESS:8.35
Sep 26 17:19:45 darkstar pppd[3629]: pppd 2.4.4 started by root, uid 0
Sep 26 17:19:45 darkstar pppd[3629]: Using interface ppp0
Sep 26 17:19:45 darkstar pppd[3629]: Connect: ppp0 <--> 8.35
Sep 26 17:19:46 darkstar pppd[3629]: CHAP authentication succeeded: CHAP authentication success, unit 482
Sep 26 17:19:46 darkstar pppd[3629]: CHAP authentication succeeded
Sep 26 17:19:46 darkstar pppd[3629]: local IP address **.**.**.**
Sep 26 17:19:46 darkstar pppd[3629]: remote IP address **.**.**.**
Sep 26 17:19:46 darkstar pppd[3629]: primary DNS address **.**.**.**
Sep 26 17:19:46 darkstar pppd[3629]: secondary DNS address **.**.**.**
Sep 26 17:21:20 darkstar ntpd[2931]: Listening on interface #3 ppp0, **.**.**.**#123 Enabled
Sep 26 17:24:01 darkstar pppd[3629]: Terminating on signal 15
Sep 26 17:24:01 darkstar pppd[3629]: Connect time 4.3 minutes.
Sep 26 17:24:01 darkstar pppd[3629]: Sent 0 bytes, received 0 bytes.
Sep 26 17:24:01 darkstar pppd[3629]: Connection terminated.
Sep 26 17:24:01 darkstar pppd[3629]: Exit.
Sep 26 17:24:20 darkstar ntpd[2931]: Deleting interface #3 ppp0, **.**.**.**#123, interface stats: received=0, sent=0, dropped=0, active_time=180 secs
Sep 26 17:27:45 darkstar pppd[3888]: Plugin pppoatm.so loaded.
Sep 26 17:27:45 darkstar pppd[3888]: PPPoATM plugin_init
Sep 26 17:27:45 darkstar pppd[3888]: PPPoATM setdevname_pppoatm - SUCCESS:8.35
Sep 26 17:27:45 darkstar pppd[3889]: pppd 2.4.4 started by root, uid 0
Sep 26 17:27:45 darkstar pppd[3889]: Using interface ppp0
Sep 26 17:27:45 darkstar pppd[3889]: Connect: ppp0 <--> 8.35
Sep 26 17:27:45 darkstar pppd[3889]: CHAP authentication succeeded: CHAP authentication success, unit 20052
Sep 26 17:27:45 darkstar pppd[3889]: CHAP authentication succeeded
Sep 26 17:27:45 darkstar pppd[3889]: local IP address **.**.**.**
Sep 26 17:27:45 darkstar pppd[3889]: remote IP address **.**.**.**
Sep 26 17:27:45 darkstar pppd[3889]: primary DNS address **.**.**.**
Sep 26 17:27:45 darkstar pppd[3889]: secondary DNS address **.**.**.**

Que se passe-t'il? (j'ai effacé les adresses IP, je ne sais pas si c'est vraiment nécessaire)