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Re: [Xen-users] Ideal(istic) Xen firewall design



Hi all,

Marcus Brown wrote:

> I've got a coloured version (hey it's therapy!) with more domUs,
> but here's an ASCII version of the current design:
> 
> OPTION C-v3.1
> =============
>                                                 Internet
>                                                     |
>                                                   eth1
>             
> ________________________________________|__________________________________________
>             |       
> ________________________________|__________________________________       |
>             |       |                                                         
>         |       |
>             |       |                            Firewall                     
>         |       |
> Local eth0 =|=======|                             (dom1)                      
>         |=======|= eth2 DMZ
>             |       
> |_________________________________________________________________|       |   
> (optional)
>             |          |                      |                    |          
>                 |
>             |        eth3                   eth4                 eth5         
>                 |
>             |          |   ________________   |   ______________   |   
> _______________        |
>             |          |   | Proxy Server |   |   | Web Server |   |   | iPaq 
> Server |        |
>             |          |   | (domU1)      |   |   | (domU2)    |   |   | 
> (dom2)      |========|= USB Host #1
>             |          |   |______________|   |   |____________|   |   
> |_____________|        | (for BT Dongle)
>             |          |  /                   |  /                 |  /       
>                 | ( and cradle )
>             |          | /                    | / _______________  | /        
>                 |
>             |          |/                     |/  | Mail Server |  |/         
>                 |
>             |          |                      |   | (domU3)     |  |          
>                 |
>             |          |                      |   |_____________|  |          
>                 |
>             |          |                      |  /                 |          
>                 |
>             |          |                      | /                  |          
>                 |
>             |          |                      |/                   |          
>                 |
>             |       xen-br0                  br1                  br1         
>                 |
>             |          |                      !                    !          
>                 |
>             |       
> ___|_______________________________________________________________       |
>             |       |                                                         
>         |       |
>             |       |                              dom0                       
>         |       |
>             
> |_______|_________________________________________________________________|_______|
> 

This setup works extremely well for my purposes.
I have, however, noticed network performance issues when scp'ing from dom0 to a 
client in the
local 'Green Zone'.
Rather than the 4MB/s I'd expect (PIIX4 ata33 IDE with software raid), I'm only 
getting 1.4MB/s :(
(screen shots here: http://marcusbrutus.cust.internode.on.net/Computers/C3-1 )

I appreciate there's a lot more calculation going on, but still ...

>Mike Tierney schrieb:
>>
>
>>>> But it is still tempting to just do away with the seperate firewall vm
>>>> and
>>>> do all the firewalling in Dom0!
>>>>
>>>>


With this in mind, I might be prepared to change my setup to something like 
this:

 OPTION C-v3.2
 =============
                                                 Internet
                                                     |
                                                   eth1
             
________________________________________|__________________________________________
             |       
________________________________|__________________________________       |
             |       |                                                          
       |       |
             |       |                            Firewall                      
       |       |
             |       |                             (dom1)                       
       |=======|= eth2 DMZ
             |       
|_________________________________________________________________|       |   
(optional)
             |          |                      |                    |           
               |
             |        eth3                   eth4                 eth5          
               |
             |          |   ________________   |   ______________   |   
_______________        |
             |          |   | Proxy Server |   |   | Web Server |   |   | iPaq 
Server |        |
             |          |   | (domU1)      |   |   | (domU2)    |   |   | 
(dom2)      |========|= USB Host #1
             |          |   |______________|   |   |____________|   |   
|_____________|        | (for BT Dongle)
             |          |  /                   |  /                 |  /        
               | ( and cradle )
             |          | /                    | / _______________  | /         
               |
             |          |/                     |/  | Mail Server |  |/          
               |
             |          |                      |   | (domU3)     |  |           
               |
             |          |                      |   |_____________|  |           
               |
             |          |                      |  /                 |           
               |
             |          |                      | /                  |           
               |
             |          |                      |/                   |           
               |
             |       xen-br0                  br1                  br1          
               |
             |          |                      !                    !           
               |
             |          |  
_____________________________________________________________       |
             |           \ |                                                    
       |       |
 Local eth0 =|============+|                        dom0                        
       |       |
             
|_____________|___________________________________________________________|_______|


However, as the bandwidth throughput issue would still remain for all the other 
domains, I'm not
sure if there's a real benefit.
I have a burner in this machine, with the hopes of using it for domain 
filesystem backups in the future.

Can I assume that this performance would be improved dramatically using a MP 
machine (or HT) ?

Are there other ways of improving this performance?

Appreciate your advice.

Marcus.

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