No internet conn. on Fedora 9 via UMTS modem

[IloChab]

On Fedora 8 everything worked fine.

I connected to the internet using my UMTS phone running wvdial with this configuration:
[Dialer Defaults]
Modem = /dev/ttyACM0
Init1 = ATZ
;Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init2 = AT+CGDCONT=1,"IP","naviga.tre.it",,0,0
Modem Type = USB Modem
ISDN = 0
Modem = /dev/ttyACM0
Baud = 460800
Carrier Check = no
Phone = *99#
Username = 'a'
Password = ''

On Fedora 9 I did the same:
I can get the connection to my ISP up, but I can't access the internet.

I run wvdial and I get:
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: AT+CGDCONT=1,"IP","naviga.tre.it",,0,0
AT+CGDCONT=1,"IP","naviga.tre.it",,0,0
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT
~[7f]}#@!}!}!} }9}#}%B#}%}(}"}'}"}"}&} } } } }%}& }^Q}%L5~
--> Carrier detected. Waiting for prompt.
~[7f]}#@!}!}"} }9}#}%B#}%}(}"}'}"}"}&} } } } }%}& }^Q}% X~
--> PPP negotiation detected.
--> Starting pppd at Mon Aug 4 17:29:21 2008
--> Pid of pppd: 11627
--> Using interface ppp0
--> pppd: 8
--> pppd: 8
--> pppd: 8
--> pppd: 8
--> pppd: 8
--> pppd: 8
--> local IP address 10.110.131.215
--> pppd: 8
--> remote IP address 10.64.64.64
--> pppd: 8
--> primary DNS address 62.13.171.1
--> pppd: 8
--> secondary DNS address 62.13.171.2
--> pppd: 8

I can see traffic on the link (for example with etherape or via my ISP's counters).

If I run ifconfig I get:

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:20154 errors:0 dropped:0 overruns:0 frame:0
TX packets:20154 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1907166 (1.8 MiB) TX bytes:1907166 (1.8 MiB)

ppp0 Link encap:Point-to-Point Protocol
inet addr:10.110.131.215 P-t-P:10.64.64.64 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:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:58 (58.0 b) TX bytes:110 (110.0 b)


I can't surf the net, no address can be reached, even numeric ones (not resolved via dns).

I can't traceroute or ping any address (neither symbolic neither numeric).

The big difference that I can see between F9 and F8 is that on F8 I hadn't NetworkManger's service turned on, but I tryed to switch it off on F9 too and anything changed.

I tried to turn off my firewall too (...just in case) but anything changed.

So MY QUESTIONs are:

why I can't get a working internet connection even if I'm really linked and communicating with my ISP?

If it's not a dns or firewall problem, what else could be?

What other checks could I do on this problem?

[of course my phone is working and if I reboot my old F8 it surfs too]


Any help will be appreciated!
Ciao
Licia

[IloChab]

I solved my problem.

I checked the content of resolv.conf and I saw that evenif wvdial traced the acquisition of new dns

[
--> primary DNS address 62.13.171.1
--> pppd: 8
--> secondary DNS address 62.13.171.2
]

it didn't store them into resolv.conf, but it remained with my old ones.

I think that for some reason my mobile's ISP pretends that I use its DNSs because changing by hand resolv.conf's content I got every thing to work.

Turning off NetworkManager's service and turning on network's service I got this change on resolv.conf automatic again (how it was on my old F8).
Yesterday I made it wrong because I just turned off NetworkManager without turning on network's service.

Even if I did not receive any explicit help from the group I have to thank you anyway because the tip's absence let me know that there weren't obvious further checks to do and that the answer lied in some subtle detail.

Ciao, ciao
Licia