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[SOLVED] KVM: problem with Internet access for guest
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Astronaut
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Joined: 06 Oct 2012
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PostPosted: Tue Apr 30, 2013 1:26 am    Post subject: [SOLVED] KVM: problem with Internet access for guest Reply with quote

Hello everyone!

I'm trying to get a KVM guest OS to access the internet through a bridge.

I was following the wiki article, specifically this segment http://en.gentoo-wiki.com/wiki/KVM#Launch_KVM_Guest1_with_network_enabled


What I've done so far:


+ I have a tap0 interface added to a bridge (NAT), I can ping from the guest OS all the host's interfaces, services like ssh are operational.
+ ip forwarding on host
+ iptables accept incoming traffic from bridg


The problem

when following traffic with tracepath from the guest, it always stops at the bridge's ip address (configured as the default gateway).

P.S: I don't use eth0 (though the interface is up and configured ) as I can only connect from my Host through ppp0 or wlan0, thus, I didn't add eth0 to the bridge

Any help would be appreciated


Last edited by Astronaut on Wed May 08, 2013 2:05 am; edited 1 time in total
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_______0
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PostPosted: Sun May 05, 2013 1:19 pm    Post subject: Reply with quote

wireless nics don't allow bridge mode.

if all the fancy network set up fails, try user mode networking, which is default I think.
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Hu
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PostPosted: Sun May 05, 2013 4:56 pm    Post subject: Reply with quote

Why do you want to use a bridge instead of NAT? Your description includes steps that are unnecessary for a bridge. NAT is more trouble to set up, but will perform much better than user mode networking.

_______0: I have heard of some wireless cards which are incapable of bridge mode, but I thought that was because the manufacturer shipped them without full functionality. Are you saying that all wireless cards are incapable of bridge mode?
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_______0
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PostPosted: Tue May 07, 2013 2:41 pm    Post subject: Reply with quote

Hu wrote:
I have heard of some wireless cards which are incapable of bridge mode, but I thought that was because the manufacturer shipped them without full functionality. Are you saying that all wireless cards are incapable of bridge mode?


The time I tried bridge with a wifi adapter and searching for a solution I never once saw anyone specify a wifi adapter with bridge support. Either the functionality is hidden or no-one has bothered trying it out. But that was quiet some time ago. Perhaps now bridge mode is more mainstream in wifi adapters.

I should find out.
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xming
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PostPosted: Tue May 07, 2013 4:03 pm    Post subject: Reply with quote

Some wireless cards can be bridged, it's called the monitor mode. All those cards which can be used as DIY wireless AP can be put in monitor mode.
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Astronaut
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PostPosted: Wed May 08, 2013 2:04 am    Post subject: Reply with quote

Hello everyone!


Thanks for your suggestions and ideas.

Two solutions that I'm using for now:

- user mode networking with ports redirection (redirecting ssh for example)

- I've abandoned direct bridging and now I'm using NAT.
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