Re: inquiry about differences between the tap and the vnet in the virt-manager

["wh.h@xxxxxxxxxxx" <wh.h@xxxxxxxxxxx>]

thanks for your reply!

I have plugged the tap0 to the bridge.

when I create the tap0:

tunctl -t tap0 -u root

brctl addif br0 tap0

ifconfig tap0 up

chmod a+rw /dev/net/tun

echo 1 > /proc/sys/net/ipv4/ip_forward

iptables -t nat -A POSTROUTING -j MASQUERADE

so I think this is not the reason.

---

wh.h@xxxxxxxxxxx

 

From: Michal Privoznik

Date: 2015-04-20 18:09

To: wh.h@xxxxxxxxxxx; libvirt-users

Subject: Re: inquiry about differences between the tap and the vnet in the virt-manager

On 19.04.2015 04:02, wh.h@xxxxxxxxxxx wrote:

> inquiry about differences between the tap and the vnet in the virt-manager

>

 

> when I establish the network by the first method: create a bridge with the help of Linux commad: brctl, tap0 device is created in the host and assigned to the guest OS. tap0 device gets a name “eth0” in the guest OS.

> I use “ping ” command to test network state . I get the following result :

> concept explanation :

> local host: the OS where the guest OS is running

> remote host: another server which is connected to the local host using ethernet network .

> and this is my results:

> ping local host from guest OS is OK, I get reply from local host;

> ping remote host from local host is OK, I get reply from remote host;

> ping remote host from guest OS is not OK, I don’t get any reply from remote host; and this is my question.

 

Do you plug the tap0 into the bridge? This could be the missing piece.

 

Michal

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