RE: [Xen-users] HVM Network Interfaces

["Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>]

 

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From: Fajar A. Nugraha [mailto:fajar@xxxxxxxxx]
Sent: Tue 27/07/2010 08:58
To: Jonathan Tripathy
Cc: Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] HVM Network Interfaces

On Tue, Jul 27, 2010 at 2:40 PM, Jonathan Tripathy <jonnyt@xxxxxxxxxxx> wrote:
> Hi Everyone,
>
> In my HVM guest's config file, I have given my guest 3 interface. I have
> called them fw1, fw2 and fw3. I have joined each interface to a bridge on
> the Dom0. This does appear when I do a "brctl show". However, there are 3
> other interfaces also added called tapx.0,tapx.1 and tapx.2 (Where x is the
> domain ID for the guest). Furthermore, I am only able to run tcpdump on the
> tap interfaces; if I run tcpdump on the fw1,fw2 or fw3 interfaces, no
> packets are detected.

tap interfaces -> qemu-emulated NICs (realtek model by default), used
when no PV drivers installed (using OS' own driver for that model)

vif interfaces (the one that you can rename) -> xen network frontend
NICs, used when you have PV drivers installed (like GPLPV,
http://meadowcourt.org/downloads/)

--
Fajar

--------------------------------------------------------------------------------------------------------------------------------------

 

Hi Fajar,

 

What is the point of Xen showing the vif interfaces then for HVM guests? Is there any way to fix the name of the tap interfaces? There are some iptables rules that I need to script when starting PV guests, but they need to know the HVM guest's tap name.

 

BTW, my HVM guest is a FreeBSD firewall, so GPLPV isn't an option :(

 

Thanks

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