At 12:40 PM 2/21/2014, you wrote: >On Fri, Feb 21, 2014 at 1:55 PM, david <david at 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/6/html/Security_Guide/sect-Security_Guide-Firewalls-FORWARD_and_NAT_Rules.html > >-- > 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.