вот так выглядит рабочая конфигурация:
dsl0 Link encap:Point-to-Point Protocol
inet addr:89.209.***.*** P-t-P:89.209.95.254 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1400 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:3
RX bytes:130 (130.0 b) TX bytes:130 (130.0 b)
dsl1 Link encap:Point-to-Point Protocol
inet addr:213.231.***.*** P-t-P:213.231.0.18 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1400 Metric:1
RX packets:11 errors:0 dropped:0 overruns:0 frame:0
TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:297 (297.0 b) TX bytes:325 (325.0 b)
eth0 Link encap:Ethernet HWaddr 00:25:90:A5:0F:26
inet addr:172.22.11.150 Bcast:172.22.31.255 Mask:255.255.224.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1997 errors:0 dropped:16 overruns:0 frame:0
TX packets:51 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:244214 (238.4 Kb) TX bytes:7524 (7.3 Kb)
Interrupt:16 Memory:df900000-df920000
eth1 Link encap:Ethernet HWaddr 00:25:90:A5:0F:27
inet addr:10.10.10.10 Bcast:0.0.0.0 Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:644 errors:0 dropped:5 overruns:0 frame:0
TX packets:126 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:209709 (204.7 Kb) TX bytes:16234 (15.8 Kb)
Interrupt:20 Memory:dfa00000-dfa20000
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:132 errors:0 dropped:0 overruns:0 frame:0
TX packets:132 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9384 (9.1 Kb) TX bytes:9384 (9.1 Kb)
vlan12 Link encap:Ethernet HWaddr 00:25:90:A5:0F:27
inet addr:172.17.10.19 Bcast:172.17.10.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:55 errors:0 dropped:0 overruns:0 frame:0
TX packets:70 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4581 (4.4 Kb) TX bytes:8153 (7.9 Kb)
vlan24 Link encap:Ethernet HWaddr 00:25:90:A5:0F:27
inet addr:192.168.192.168 Bcast:0.0.0.0 Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:502 errors:0 dropped:31 overruns:0 frame:0
TX packets:46 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:160772 (157.0 Kb) TX bytes:4860 (4.7 Kb)
dsl0 - PPPoE провайдера №1
dsl1 - PPTP провайдера №2
eth0 - локальный сеть
eth1 - провайдерский свич с тегированными VLAN
vlan12 - сеть провайдера №2 вытащенная из eth1
vlan24 - сеть провайдера №1 вытащенная из eth1
Системный лог при падении pppoe:
Jul 4 10:40:18 web pppd[4669]: Terminating connection due to lack of activity.
Jul 4 10:40:18 web pppd[4669]: Connect time 15.1 minutes.
Jul 4 10:40:18 web pppd[4669]: Sent 76 bytes, received 42 bytes.
Jul 4 10:40:18 web pppd[4669]: restoring old default route to eth0 [172.22.11.102]
Jul 4 10:40:18 web pppd[4669]: Script /etc/ppp/ip-down finished (pid 5698), status = 0x0
Jul 4 10:40:20 web ntpd[5201]: Deleting interface #8 dsl0, 89.209.101.144#123, interface stats: received=0, sent=0, dropped=0, active_time=900 secs
Jul 4 10:40:20 web ntpd[5201]: 62.149.0.30 interface 213.231.5.203 -> 172.22.11.150
Jul 4 10:40:20 web ntpd[5201]: peers refreshed
Jul 4 10:40:20 web pppd[4669]: Connection terminated.
Jul 4 10:40:20 web avahi-daemon[1367]: Withdrawing workstation service for dsl0.
Jul 4 10:40:20 web pppd[4669]: Exit.
И кстати, есть ещё одна лажа, 2 гигабитные интеловые сетевухи 82574L и 82579LM, которые какого-то фига работают на 100Мбит/c.