On Fri, Feb 21, 2014 at 1:55 PM, david <david@xxxxxxxx> 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/6/html/Security_Guide/sect-Security_Guide-Firewalls-FORWARD_and_NAT_Rules.html
--
Les Mikesell
lesmikesell@xxxxxxxxx
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