[LiSA-Users] Regarding LiSA trunk mode

[chicany]

Hi Radu,

I made the necessary changes in my LiSA - GNS3 tutorial. Please, check the
paragraph 17 c) and d).

http://brezular.wordpress.com/2010/09/25/lisa/

Bye!

Radovan Brezula


2013/6/5 Radu Rendec <radu.rendec at mindbit.ro>

> **
> On Tue, 2013-06-04 at 15:57 -0400, chicany wrote:
>
>
>  *I've managed to replicate Ammar's topology and reproduce the problem. I
> can confirm that the problem is actually caused by hardware VLAN untagging.
> But the problem is that I have no idea how to change the NIC type for GNS3
> VirtualBox guests. All NIC settings in VirtualBox are overwritten by GNS3
> at the time when it starts the virtual machines. I couldn't find any NIC
> type setting in the GNS3 interface.*
>
>
>  Drag  Vbox guest from the left panel  and drop it on GNS3 desktop. Left
> click on Vbox guest and select *Configure. *Now you select  NIC type for
> particular VBox guest*. *
>
>
> Thanks for the hints! I managed to start the test topology (screenshot
> attached) with "pcnet2" instead of "automatic". Now it works as expected. I
> attached config.text for the lisa nodes (it's the same on both nodes). I
> guess this is the "official" workaround for getting lisa trunk interfaces
> to work in VirtualBox. Perhaps you can do me a favour and add this note to
> your page that describes lisa configuration in GNS3 :)
>
> Change of MAC for VLAN interfaces isn't necessary in *this particular*scenario, since I'm not using any layer 3 functionality on top of lisa (the
> VLAN interfaces don't even exist for the 2 VLANs that I configured). It *
> is* required though when VLAN interfaces are used and they are assigned
> IP addresses.
>
>
>  I successfully tested trunking between two LiSA instances emulated by
> QEMU on GNS3. I used i82557b eth card type*. *Change of MAC for VLAN
> interface was required in order to get it working.
>
>  I took a look to the kernel tree. The i82557 is supported by the "e100"
> driver. Quoting from e100.c - the big comment at the beginning of the file,
> section V:
>
>  *VLAN offloading of tagging, stripping and filtering is not supported,
> but driver will accommodate the extra 4-byte VLAN tag for processing by
> upper layers.*
>
>
> So hardware VLAN untagging (or "stripping" as they call it) is not
> supported at all, and the driver will pass the original frame (including
> the 802.1q tag) to the upper layers. This is why it worked for you in QEMU.
>
> Thanks again for all the hard work of integrating lisa into GNS3 and
> creating the VM images!
>
> Cheers,
>
> Radu
>
>
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>
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