Can't connect to the internet after "aptitude safe-upgrade"

[tan_ny@hushmail.com]

Hi!

I use an ADSL modem to connect to the internet. A few hours ago I ran "aptitude safe-upgrade" on two 
computers with sid installed on them. As soon as the upgrade finished I lost 
my internet connection on both computers. When I rebooted them and 
ran "pon dsl-provider" and ifconfig, ppp0 did show up. Here are the ifconfig outcomes.

Outcome 1

eth0      Link encap:Ethernet  HWaddr 10:c3:7b:9d:d0:d2  
          inet6 addr: fe80::12c3:7bff:fe9d:d0d2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:614 (614.0 B)  TX bytes:4184 (4.0 KiB)

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:65536  Metric:1
          RX packets:378 errors:0 dropped:0 overruns:0 frame:0
          TX packets:378 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:30580 (29.8 KiB)  TX bytes:30580 (29.8 KiB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:219.77.72.189  P-t-P:203.218.189.254  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:94 (94.0 B)  TX bytes:54 (54.0 B)

Outcome 2

eth0      Link encap:Ethernet  HWaddr 40:61:86:b3:13:66  
          inet6 addr: fe80::4261:86ff:feb3:1366/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9 errors:0 dropped:0 overruns:0 frame:0
          TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:552 (552.0 B)  TX bytes:3201 (3.1 KiB)

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:65536  Metric:1
          RX packets:400 errors:0 dropped:0 overruns:0 frame:0
          TX packets:400 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:32160 (31.4 KiB)  TX bytes:32160 (31.4 KiB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:219.77.72.186  P-t-P:203.218.189.254  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:54 (54.0 B)  TX bytes:54 (54.0 B)

/etc/resolv.conf on the computers seemed OK, but I couldn't ping any website or connect to any website 
using Firefox. I tried using OpenDNS but it didn't help.

On the 
computer that I'm using now I didn't run "aptitude safe-upgrade" and the
 internet connection is fine, so the problem isn't related to my ADSL 
modem or my ISP.

Someone suggested that I should run

/etc/init.d/network-manager restart

but it didn't work.

Thanks for any help.

NY