I am using DSL(PPPOE) connection in ubuntu. It has two part (I am not sure), when I just connect the cable, system automatically get an IP address started with 172.x.x.x(DHCP). When I connect using username/password (PPPOE) I get another IP started with 10.x.x.x and can access internet but can't access some local IP (in my LAN), which are some FTP, media server provided by my ISP. I complained about that to my ISP but they reply
Windows is working
It's true, Windows 7 is working fine with this settings. I can access internet and local server at the same time. Also I use a WIFI router (TP-link TL-WR340G/TL-WR340GD) which result the same problem. So when I connect cable directly to system and use Windows 7 than everything is fine. Otherwise problem. Similar problem discussed here.
Edit
before connect.
route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.100.0.1 0.0.0.0 UG 0 0 0 eth0
172.100.0.0 0.0.0.0 255.255.0.0 U 1 0 0 eth0
after connect.
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.12.44.91 0.0.0.0 UG 0 0 0 ppp0
10.12.44.91 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
ifconfig after connect
eth0 Link encap:Ethernet HWaddr 74:d0:2b:d5:b3:6c
inet6 addr: fe80::76d0:2bff:fed5:b36c/64 Scope:Link
inet6 addr: 2002:ac64:154:c:76d0:2bff:fed5:b36c/64 Scope:Global
inet6 addr: fec0::c:76d0:2bff:fed5:b36c/64 Scope:Site
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:26582 errors:0 dropped:18 overruns:0 frame:0
TX packets:2340 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2542063 (2.5 MB) TX bytes:244938 (244.9 KB)
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:65536 Metric:1
RX packets:4118 errors:0 dropped:0 overruns:0 frame:0
TX packets:4118 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:336759 (336.7 KB) TX bytes:336759 (336.7 KB)
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.12.44.95 P-t-P:10.12.44.91 Mask:255.255.255.255
inet6 addr: fe80::a536:c7ae:e079:d88d/10 Scope:Link
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:689 errors:0 dropped:0 overruns:0 frame:0
TX packets:744 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:385746 (385.7 KB) TX bytes:75296 (75.2 KB)
I used network manager to create network(DSL connection)
