network in virtual machine [KVM]

[John Summerfield]

Konstantin Svist wrote:
> Konstantin Svist wrote:
>> Hi all,
>>
>> Question: how do I set up networking in a [KVM] virtual machine guest so
>> that I can get to the internet?
>>
>> I've set up an F8 install with default option (Virtual Network/default)
>> - and I can connect to the guest from the host - but I can't run a yum
>> update from the guest.
>> On the host i see "virbr0" in ifconfig output, with same subnet as the
>> guest - but that doesn't show up in standard network configuration 
>> applets.
>>
>>
>> Thanks!
> 
> found answer on my own:
> go to firewall config applet and enable masquerading for eth0

You do need masquerading some place, but not necessarily there. For 
reasons not relevant to the topic, I run several /24 networks here; each 
needs to be able to route to all the others, but the only place I need 
to masquerade is at the boundary to the Internet, a Pentium IV server 
(as opposed to the inconnect router that attaches it to the 'net).

Xen on fedora (and probably the alternatives) can share the LAN, or use 
its own virtual LAN. If you use the former, DHCP functions as usual and 
you get the regular network setup. In the latter case, masquerading may 
be convenient, but isn't essential (and is harmful if you want to run 
virtual servers).




-- 

Cheers
John

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