gigabit network on guests ?

[patelbhavesh]

How do we ensure that the guest is using gigabit network.
The reason i ask is because when i run the command

Code: Select all

ethtool eth0

On a debian lenny guest , i only get the following information

Settings for eth0:
Current message level: 0x00000007 (7)
Link detected: yes


versus on a physical box you get details which tell you about the connectivity speed etc.

Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Current message level: 0x000000ff (255)
Link detected: yes

[patelbhavesh]

In the above post im using PCNet-PC II (Nat)

I changed it to use the Intel Pro/1000(desktop) (NAT)

Now when i run ethtool i see the values of things like duplex etc correctly.

My next question is , on the host computer , i reguarly switch between 100 Mbps @ home and 1000 Mbps @ work.
But obviously from a VM guest perspective is it safe to assume that it does not know what the host is operating in, because it is NAT'ed to the host.So does this mean that in both cases the guest gets the highest possible speed provided by the host or do i need to do some additional configuration to tell the guest that i have switched between 100 and 1000 Mbps ?

Any advice on how this works?