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i use the code:"sudo pppoeconf "to connect to the internet
上网一两分钟掉一次！
还望打人指点一二啊！

root@ubuntu:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:30:18:ac:12:76
inet6 addr: fe80::230:18ff:feac:1276/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:41158 errors:0 dropped:0 overruns:0 frame:0
TX packets:30660 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:28472186 (28.4 MB) TX bytes:4907496 (4.9 MB)
Interrupt:253 Base address:0xc000

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:192 errors:0 dropped:0 overruns:0 frame:0
TX packets:192 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:55180 (55.1 KB) TX bytes:55180 (55.1 KB)

ppp1 Link encap:Point-to-Point Protocol
inet addr:120.34.52.245 P-t-P:120.34.48.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:149 errors:0 dropped:0 overruns:0 frame:0
TX packets:162 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:82967 (82.9 KB) TX bytes:33695 (33.6 KB)

ppp2 Link encap:Point-to-Point Protocol
inet addr:120.34.131.11 P-t-P:120.34.128.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:445 errors:0 dropped:0 overruns:0 frame:0
TX packets:395 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:253140 (253.1 KB) TX bytes:64929 (64.9 KB)

ppp3 Link encap:Point-to-Point Protocol
inet addr:120.34.130.138 P-t-P:120.34.128.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:60 errors:0 dropped:0 overruns:0 frame:0
TX packets:67 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:25430 (25.4 KB) TX bytes:12042 (12.0 KB)

ppp4 Link encap:Point-to-Point Protocol
inet addr:120.34.53.174 P-t-P:120.34.48.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:886 errors:0 dropped:0 overruns:0 frame:0
TX packets:947 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:679350 (679.3 KB) TX bytes:182132 (182.1 KB)

不成熟的做法，不清楚管不管用：
1、删掉network-manager；
2、sudo pppoeconf时不要选择自动连接，而且每次用pon dsl-provider手动连接之前先用poff dsl-provider挂断。

network-manager；确实用不来 ， 不知道是不是太高级的缘故 ，还是用命令吧 习惯了

用 networkmanager 的话再其他地方修改 lcp-echo-failure及lcp-echo-interval设定都是无效的，要到 /etc/NetworkManager/system-connections/ 修改相应的配置文件