Такая ситуация: имеется Ubuntu 9.10, АДСЛ интернет. NM не заработал, пришлось пользовать pppoeconf.
eugene@rand:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:0c:76:62:00:17
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:76ff:fe62:17/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:116 errors:0 dropped:0 overruns:0 frame:0
TX packets:31 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15331 (15.3 KB) TX bytes:3766 (3.7 KB)
Interrupt:17 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:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:240 (240.0 B) TX bytes:240 (240.0 B)
eugene@rand:~$ sudo pppoeconf
[sudo] password for eugene:
Plugin rp-pppoe.so loaded.
RP-PPPoE plugin version 3.8p compiled against pppd 2.4.5
eugene@rand:~$ plog
Jan 5 12:47:11 rand pppd[1966]: Connect: ppp0 <--> eth0
Jan 5 12:47:12 rand pppd[1966]: Remote message: Authentication success,Welcome!
Jan 5 12:47:12 rand pppd[1966]: PAP authentication succeeded
Jan 5 12:47:12 rand pppd[1966]: peer from calling number 00:18:82:30:01:F1 authorized
Jan 5 12:47:12 rand pppd[1966]: replacing old default route to eth0 [192.168.1.1]
Jan 5 12:47:12 rand pppd[1966]: Cannot determine ethernet address for proxy ARP
Jan 5 12:47:12 rand pppd[1966]: local IP address 95.81.201.247
Jan 5 12:47:12 rand pppd[1966]: remote IP address 192.168.222.249
Jan 5 12:47:12 rand pppd[1966]: primary DNS address 89.151.191.2
Jan 5 12:47:12 rand pppd[1966]: secondary DNS address 89.151.190.213
eugene@rand:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:0c:76:62:00:17
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:76ff:fe62:17/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:687 errors:0 dropped:0 overruns:0 frame:0
TX packets:47 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:88084 (88.0 KB) TX bytes:4475 (4.4 KB)
Interrupt:17 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:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:240 (240.0 B) TX bytes:240 (240.0 B)
ppp0 Link encap:Point-to-Point Protocol
inet addr:95.81.201.247 P-t-P:192.168.222.249 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)
eugene@rand:~$
Как видно ppp0 работает, его видит Эмпати, но Мозилла не заходит практически ни на один сайт, кроме гугла и ya.ru (Пишет Waiting for ...). Синаптик интернета тож не видит. Пинг на гугл и на негрузящийся сайт:
eugene@rand:~$ ping google.ru
PING google.ru (216.239.59.104) 56(84) bytes of data.
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=1 ttl=55 time=132 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=2 ttl=55 time=131 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=3 ttl=55 time=132 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=4 ttl=55 time=131 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=5 ttl=55 time=132 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=6 ttl=55 time=133 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=7 ttl=55 time=132 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=8 ttl=55 time=133 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=9 ttl=55 time=134 ms
64 bytes from gv-in-f104.1e100.net (216.239.59.104): icmp_seq=10 ttl=55 time=132 ms
^C
--- google.ru ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9008ms
rtt min/avg/max/mdev = 131.144/132.485/134.055/1.062 ms
eugene@rand:~$ ping mozilla.com
PING mozilla.com (63.245.209.10) 56(84) bytes of data.
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=1 ttl=246 time=286 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=2 ttl=246 time=286 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=3 ttl=246 time=287 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=4 ttl=246 time=286 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=5 ttl=246 time=289 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=6 ttl=246 time=286 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=7 ttl=246 time=286 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=8 ttl=246 time=286 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=9 ttl=246 time=286 ms
64 bytes from moz.com01.nslb.sj.mozilla.com (63.245.209.10): icmp_seq=10 ttl=246 time=286 ms
^C
--- mozilla.com ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9001ms
rtt min/avg/max/mdev = 286.621/287.091/289.637/0.862 ms
Встречал описания похожих проблем, но не видел решения (не, чето насчет MTU было, поменял на 1492 - ничего).
На всякий случай содержимое interfaces:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.1.2
netmask 255.255.255.0
gateway 192.168.1.1
iface dsl-provider inet ppp
pre-up /sbin/ifconfig eth0 up # line maintained by pppoeconf
provider dsl-provider