Re: [lwip-users] Virtual machines in the same host (bridge).

[Norberto R. de Goes Jr.]

Hello Sylvain.

Below the information asked by you. Thanks in advance!

Norberto

>>>>>>>>>> VM#1 (with lwip app):

address@hidden norberto]# brctl show

bridge name bridge id STP enabled interfaces

br0 8000.080027c07dab no p2p1

tap0

address@hidden norberto]# 

address@hidden norberto]# ip a s

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

    inet6 ::1/128 scope host 

       valid_lft forever preferred_lft forever

2: p2p1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000

    link/ether 08:00:27:c0:7d:ab brd ff:ff:ff:ff:ff:ff

    inet6 fe80::a00:27ff:fec0:7dab/64 scope link 

       valid_lft forever preferred_lft forever

4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP 

    link/ether 08:00:27:c0:7d:ab brd ff:ff:ff:ff:ff:ff

    inet 169.254.8.218/16 brd 169.254.255.255 scope global br0

    inet6 fe80::7084:1aff:fe21:998f/64 scope link 

       valid_lft forever preferred_lft forever

5: tap0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN qlen 500

    link/ether 8e:f4:c4:a8:9a:c8 brd ff:ff:ff:ff:ff:ff

    inet6 fe80::8cf4:c4ff:fea8:9ac8/64 scope link 

       valid_lft forever preferred_lft forever

address@hidden norberto]# 

address@hidden norberto]# ip r s

169.254.0.0/16 dev br0  proto kernel  scope link  src 169.254.8.218 

address@hidden norberto]#

>>>>>>>>>> VM#2 (ping executor):

address@hidden norberto]# brctl show

bridge name bridge id STP enabled interfaces

address@hidden norberto]# 

address@hidden norberto]# ip a s

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

    inet6 ::1/128 scope host 

       valid_lft forever preferred_lft forever

2: p2p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:a8:38:00 brd ff:ff:ff:ff:ff:ff

    inet 169.254.4.39/16 brd 169.254.255.255 scope global p2p1

    inet6 fe80::a00:27ff:fea8:3800/64 scope link 

       valid_lft forever preferred_lft forever

address@hidden norberto]# 

address@hidden norberto]# ip r s

169.254.0.0/16 dev p2p1  proto kernel  scope link  src 169.254.4.39 

224.0.0.0/4 dev p2p1  proto static 

address@hidden norberto]# 

2015-01-29 21:32 GMT-02:00 Sylvain Rochet <address@hidden>:

Hello Norberto,

On Thu, Jan 29, 2015 at 04:42:06PM -0200, Norberto R. de Goes Jr. wrote:
> Hi All.
>
> I have the following environment:
>
> - host Windows-7 Professional, 64 bits, with two virtual machines (Virtual
> Box), both  with Fedora-17 Distro, 32 bits;
> - the VM´s network configured as "Internal Network"
>
> I wrote a small "lwip application" based on unix port (community). It runs
> in VM #1 and a "tap0" device is created with success. In the VM#2 no
> application is running.
>
> When I "ping" the tap0 IP from the VM#1 the reply is received, no problem.
> I can see the traces reported by lwip like arp received and arp reply. But
> when I "ping" the tap0 from VM#2 I have no answer.
>
> Faced with the situation, I followed the steps suggested by another solved
> threads from this list, for instance:
> - http://lists.nongnu.org/archive/html/lwip-users/2004-08/msg00006.html
> - http://lists.nongnu.org/archive/html/lwip-users/2012-02/msg00021.html
> Basically, the threads show how to configure a linux bridge (br0) and your
> attached devices.
>
> But I did not get success still. The pings from VM#2 go from the ethernet
> to the "br0"(VM#1) device and after to the "tap0" device. There the lwIP
> generates an answer and sends it to the asking host. But then the packages
> disappear. They do not go back to the "br0" device (seen with dcpdump).
>
> Please, are there any restriction in use the lwip library in virtual
> machines hosted on the same server? More specifically with linux bridge use?

Please send the "brctl show" as well as "ip a s" and "ip r s" on both
machines.

Sylvain

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Norberto R. de Goes Jr.
CPqD - DRC
Tel.: +55 19 3705-4241 / Fax: +55 19 3705-6125
address@hidden
www.cpqd.com.br