pppoe connection establishes, but... no connect!

Esquirol · 11-24-2009, 01:52 PM

Hello,

Some months ago I have started working with Mandriva Linux 2009.1. Until now, I've experienced no problem with networking.

After the upgrading to Mandr. 2010 I got such a very annoying trouble: my pppoe-connection establishes, but I cannot reach any host.

Sometimes the pppoe-connection works OK.

Here is what some popular network diagnostic commands tell when it doesn't work properly:

Code:

$ sudo ifconfig -a
eth2      Link encap:Ethernet  HWaddr 00:02:44:BF:BF:9C  
          BROADCAST MULTICAST  MTU:1500  Metric:1        
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000                        
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)              
          Interrupt:18 Base address:0xac00                    

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:468 errors:0 dropped:0 overruns:0 frame:0
          TX packets:468 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:25740 (25.1 KiB)  TX bytes:25740 (25.1 KiB)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:91.146.xx.xx  P-t-P:217.14.207.51  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)

true_net  Link encap:Ethernet  HWaddr 00:01:6C:F4:4A:D7
          inet addr:192.168.0.33  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2290 errors:0 dropped:0 overruns:0 frame:0
          TX packets:369 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:231790 (226.3 KiB)  TX bytes:33898 (33.1 KiB)
          Interrupt:23 Base address:0xa000

My comment: the network interface I use is "true_net"; "eth2" belongs to another network adapter not connected with www;

Code:

[localuser@localhost ~]$ netstat -nr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
217.14.207.51   0.0.0.0         255.255.255.255 UH        0 0          0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 true_net
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 true_net
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
0.0.0.0         192.168.0.1     0.0.0.0         UG        0 0          0 true_net
0.0.0.0         0.0.0.0         0.0.0.0         U         0 0          0 ppp0

[localuser@localhost ~]$ netstat -ni
Kernel Interface table
Iface       MTU Met    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
lo        16436   0      540      0      0      0      540      0      0      0 LRU
ppp0       1492   0        4      0      0      0        3      0      0      0 MOPRU
true_net   1500   0     2547      0      0      0      388      0      0      0 BMRU

[localuser@localhost ~]$ cat /etc/hosts
127.0.0.1               localhost

What is wrong?

What I can do to resolve the problem?

nimnull22 · 11-24-2009, 03:05 PM

Wrong, your default route points to "true_net":
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 true_net

But if you want to communicate through pppoe, I think that default route should be on pppoe connection.

Esquirol · 11-24-2009, 11:55 PM

How I can correct it?

nimnull22 · 11-25-2009, 11:08 AM

Lets try to delete it:

route del -net 0.0.0.0 gw 192.168.0.1 netmask 0.0.0.0 true_net

Try to use pppoe.

If you will need that route type:

route add -net 0.0.0.0 gw 192.168.0.1 netmask 0.0.0.0 true_net

Esquirol · 11-27-2009, 12:38 AM

Useful advice... many thanks!

cola · 11-27-2009, 03:34 AM

I also had that problem too.
Though it's solved can you post now

Code:

netstat -nr

Don't forget to mark this thread as [SOLVED].
This option is under the "Thread Tools" above.

Esquirol · 11-27-2009, 03:51 AM

Quote:

Originally Posted by cola

I also had that problem too.
Though it's solved

I hope it is solved, but I'm not sure

Quote:

Originally Posted by cola

can you post now

Code:

netstat -nr

Of course.

Code:

[localuser@localhost ~]$ netstat -nr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
217.14.207.15   0.0.0.0         255.255.255.255 UH        0 0          0 ppp0
0.0.0.0         0.0.0.0         0.0.0.0         U         0 0          0 ppp0

Esquirol · 07-21-2010, 12:15 AM

Hello friends,

My problem repeats. The unnecessary line:

Code:

0.0.0.0         192.168.xx.xx     0.0.0.0         UG        0 0          0 true_net

appears again. But why?.. and what I should do to prevent it?

nimnull22 · 07-22-2010, 01:20 AM

Some time DHCP client on your computer can change default route, when it reconfigures interface.

Esquirol · 07-24-2010, 08:01 AM

Quote:

Originally Posted by nimnull22

Some time DHCP client on your computer can change default route, when it reconfigures interface.

When I boot from Live CD I get the same problem:

Code:

mint@mint ~ $ netstat -nr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
217.14.207.46   0.0.0.0         255.255.255.255 UH        0 0          0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth1
0.0.0.0         192.168.0.1     0.0.0.0         UG        0 0          0 eth1

The problem, apparently, is not bound up with my PC, but it is on the provider's side, isn't it?