网络的问题请教

debian用adsl拨号上网,ifconfig 指令无任何输出,ifconfig /all 报错为:/all:error fetching interface information : device not found
本来一切正常的,不知道为什么突然就这样了,郁闷死了.

怎么没人来帮一下我呢？
我现在可以上网了，但是每次都要重新运行pppoeconf才可以，不然pon dsl-provider没用。
网络还是有问题
# /etc/init.d/networking restart
* /etc/network/options is deprecated.


# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0D:60:21:37:66
inet6 addr: fe80::20d:60ff:fe21:3766/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:43 errors:0 dropped:0 overruns:0 frame:0
TX packets:49 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2997 (2.9 KiB) TX bytes:3424 (3.3 KiB)
Base address:0x2000 Memory:e8100000-e8120000

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:770 errors:0 dropped:0 overruns:0 frame:0
TX packets:770 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:53252 (52.0 KiB) TX bytes:53252 (52.0 KiB)

ppp0 Link encap:Point-to-Point Protocol
inet addr:61.171.199.148 P-t-P:218.1.1.254 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:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:54 (54.0 b) TX bytes:106 (106.0 b)


g# ifconfig /lo
/lo: error fetching interface information: Device not found
# ifconfig /pppoe
/pppoe: error fetching interface information: Device not found
# ifconfig /ppp0
/ppp0: error fetching interface information: Device not found
# ifconfig /eth0
/eth0: error fetching interface information: Device not found
# ifconfig /all
/all: error fetching interface information: Device not found

我用但中文字体是simsum，但在浏览网页的时候中文字体会发虚是什么原因？