At 12:40 PM 2/21/2014, you wrote:

On Fri, Feb 21, 2014 at 1:55 PM, david david@daku.org wrote:

...

Dear Linux Gurus

I'm having problems with KVM and networking. My guest cannot use NAT through the host's connection. This is what I've done:

I installed a new version of Centos 6.5 on the hardware. Starting with a Net-Install, I selected the Virtual Hosting, and later added "Desktop". I ran "yum update" with some reboots until nothing

needed updating.

...

The host networking is IPV4 only, using DHCP. (A different box on my home network provides DHCP and is a gateway to the internet. I have a reservation in that DHCP so that the host always gets a known IP address)

Using a Gnome desktop, as a non-root user, I installed Windows 7 Pro from an image of an ISO I had copied onto the host. In the "Networking" configuration, I chose "DEFAULT". The documentation of KVM seems to imply that it should give me a NAT'ted interface to my host's connection (I wasn't worried about performance at this point).

When the installation was complete, Windows tries to configure the network. Running the Windows command line "IPCONFIG" program, the Windows guest program does get an IP address from the host (192.168.122.xxx), but the guest cannot communicate to the outside world. I can ping the host, but nothing else.

Is there some other magic sauce, perhaps in the IPTABLES of the host, that will allow the guest to use the internet? I'm baffled.

Do you have ip_forwarding enabled in sysctl?

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/...

-- Les

OOOPS <Putting that white pointy hat on my head and sitting in the corner>

It's so obvious, I forgot. In my "normal" installations, that's taken care of by my scripts so I forgot to do it by hand.