Hello,
I use bridge to give user-mode-linux boxs an Internet access
When the uml-host is connected to the gateway via a cross-wired cable,
everything works fine.
If I put a hub (I've also make tests with another hub and a switch) between
the host and the gateway, uml-guests no more see the gateway (and therefore
no more see the Internet)
In both case the uml-host can ping the gateway and the uml-guests, the
gateway can always ping the uml-host, and the uml-guests can always
ping the uml-host:
* direct cross wired cable between umlhost and gateway:
[umlhost:br2:192.168.1.2/24] -------- [gateway:eth4:192.168.1.1/24]
|
|
[uml1:eth0:192.168.1.3/24]
umlhost# ping 192.168.1.1 is OK
umlhost# ping 192.168.1.3 is OK
uml1# ping 192.168.1.1 is OK
* a hub (or a switch) between umlhost and gateway
[umlhost:br2:192.168.1.2/24] --[hub]-- [gateway:eth4:192.168.1.1/24]
|
|
[uml1:eth0:192.168.1.3/24]
umlhost# ping 192.168.1.1 is OK
umlhost# ping 192.168.1.3 is OK
uml1# ping 192.168.1.1 no response
gateway# ping 192.168.1.3 no response
I've noticed that dmesg gives me lot of lines like theses:
eth2: received packet with own address as source address
eth2: received packet with own address as source address
...
I first think about a MAC adress sort of conflict, so I take care of
assigning specifics ones to the uml-guests, but no changes.
What did I miss ?
Thanks,
Olivier.
PS: my current configuration look like this:
host kernel is a 2.4.22 (with almost all security patchs, skas3, and
cryptoloop) SMP enabled on a dual PIII/400
(cannot try latest 2.4 kernel now, it's planned)
umlhost# brctl show
bridge name bridge id STP enabled interfaces
br2 8000.0080c8e8ac3f no eth2
tap0
umlhost# brctl showmacs br2
port no mac addr is local? ageing timer
1 00:00:e8:3d:be:81 no 202.29 (this is the
gateway)
1 00:80:c8:e8:ac:3f yes 0.00 (this is eth2)
2 00:ff:c0:6a:b1:46 yes 0.00 (this is tap0)
2 fe:fd:0a:00:00:01 no 218.27 (this is eth0
inside uml)
umlhost# ifconfig eth2
eth2 Link encap:Ethernet HWaddr 00:80:C8:E8:AC:3F
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:1029587 errors:0 dropped:5 overruns:0 frame:104
TX packets:2307201 errors:3 dropped:0 overruns:3 carrier:0
collisions:0 txqueuelen:100
RX bytes:152173060 (145.1 MiB) TX bytes:3011077736 (2.8 GiB)
Interrupt:18 Base address:0x9000
umlhost# ifconfig tap0
tap0 Link encap:Ethernet HWaddr 00:FF:C0:6A:B1:46
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:7595 errors:0 dropped:0 overruns:0 frame:0
TX packets:7641 errors:0 dropped:2 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:6853964 (6.5 MiB) TX bytes:732177 (715.0 KiB)
umlhost# ifconfig br2
br2 Link encap:Ethernet HWaddr 00:80:C8:E8:AC:3F
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4019 errors:0 dropped:0 overruns:0 frame:0
TX packets:1342 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:394739 (385.4 KiB) TX bytes:184260 (179.9 KiB)
uml1:~# ifconfig eth0
eth0 Link encap:Ethernet HWaddr FE:FD:0A:00:00:01
inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::fcfd:aff:fe00:1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7641 errors:0 dropped:0 overruns:0 frame:0
TX packets:7595 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:625203 (610.5 KiB) TX bytes:6853964 (6.5 MiB)
Interrupt:5
gateway# ifconfig eth4
eth4 Link encap:10Mbps Ethernet HWaddr 00:00:E8:3D:BE:81
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6188 errors:0 dropped:0 overruns:0
TX packets:5398 errors:0 dropped:0 overruns:0
Interrupt:12 Base address:0xc400
