>Дайте вывод ifconfig и route во время рабочего и нерабочего подключения [root@localhost vigo]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:E0:4C:BC:C1:05
inet addr:10.1.62.189 Bcast:10.1.62.255 Mask:255.255.255.0
inet6 addr: fe80::2e0:4cff:febc:c105/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:127 errors:0 dropped:0 overruns:0 frame:0
TX packets:204 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:8809 (8.6 KiB) TX bytes:18329 (17.8 KiB)
Interrupt:19 Base address:0xa000
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:24 errors:0 dropped:0 overruns:0 frame:0
TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1656 (1.6 KiB) TX bytes:1656 (1.6 KiB)
ppp0 Link encap:Point-to-Point Protocol
inet addr:83.221.170.243 P-t-P:83.221.168.1 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)
[root@localhost vigo]# ifconfig eth0 down
[root@localhost vigo]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:E0:4C:BC:C1:05
inet6 addr: fe80::2e0:4cff:febc:c105/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15608 errors:0 dropped:0 overruns:0 frame:0
TX packets:15900 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:8175117 (7.7 MiB) TX bytes:2902414 (2.7 MiB)
Interrupt:20
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:640 errors:0 dropped:0 overruns:0 frame:0
TX packets:640 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:44160 (43.1 KiB) TX bytes:44160 (43.1 KiB)
ppp0 Link encap:Point-to-Point Protocol
inet addr:83.221.175.215 P-t-P:83.221.172.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:14152 errors:0 dropped:0 overruns:0 frame:0
TX packets:14843 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:7772955 (7.4 MiB) TX bytes:2481565 (2.3 MiB)
только после этого пинги идут в мир.