Re: [VBox-users] virtio_net guest with vlan

[Giles Coochey]

On 14/05/2013 11:16, Stephan von Krawczynski wrote:

On Tue, 14 May 2013 11:57:14 +0200
Freek de Kruijf <f.de.kru...@gmail.com> wrote:

Op dinsdag 14 mei 2013 11:25:50 schreef Stephan von Krawczynski:

Hello all,

has anybody done a linux guest on linux host that uses 802.1Q

VLans? Is

there anything special one has to do or configure on the host to make

vlan

tags work on some interface? The interface on the guest comes up,

but

cannot reach any neighbor inside the vlan. It looks like the packets are
not sent with tags.

AFAIK VirtualBox only allows 1508 bytes Ethernet packets to pass from
the physical interface to the interface of the guest. So you have to fiddle
with the MTU in all the systems in the VLAN to pass VLAN packets to the
guest.

That is a no-go. Does this mean I have to stress Franks' patience? ;-)
Honestly, you cannot virtualise server environments today without VLans...

http://www.virtualbox.org/manual/ch06.html



--
Regards,

Giles Coochey, CCNP, CCNA, CCNAS
NetSecSpec Ltd
+44 (0) 7983 877438
http://www.coochey.net
http://www.netsecspec.co.uk
gi...@coochey.net

VirtualBox also has limited support for so-called *jumbo frames*, i.e. networking packets with more than 1500 bytes of data, provided that you use the Intel card virtualization and bridged networking. In other words, jumbo frames are not supported with the AMD networking devices; in those cases, jumbo packets will silently be dropped for both the transmit and the receive direction. Guest operating systems trying to use this feature will observe this as a packet loss, which may lead to unexpected application behavior in the guest. This does not cause problems with guest operating systems in their default configuration, as jumbo frames need to be explicitly enabled.

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