[libvirt-users] Can't get cable connection working on virtual router machine

[Ajey Gore]

does you cable modem give you automatically the IP address? if thats the case then you need to do bridge configuration between nic3 and macvtap dhcp ip




and then you will be able to get dhcp attached IP to sophos vm


- ajey

On Tue, Sep 1, 2015 at 4:33 PM, Phill Edwards <philledwards at gmail.com>
wrote:

> Hi, I'm not sure what sort of diagram you mean, but I'll have a try. Does
> this help? It sounds like I need to do something to enable routing on what
> I've labelled "NIC3" on the diagram - can you please explain what I need to
> do?
> [image: Inline image 1]
> Regards,
> Phill
> On Tue, Sep 1, 2015 at 4:53 PM, Ajey Gore <ajeygore at gmail.com> wrote:
>> Can you please drop a rough diagram here? I think you are routing through
>> this VM and must have shared the host interface.
>>
>> - ajey
>>
>>
>>
>> On Tue, Sep 1, 2015 at 7:39 AM, Phill Edwards <philledwards at gmail.com>
>> wrote:
>>
>>> I'm pretty new to KVM and have a KVM CentOS 7.1 hypervisor running a few
>>> VMs. I'm moving all my VMs from an ESXi host as I want to use KVM in
>>> future. Most of my VMs are working except for one which is running a Sophos
>>> UTM router (Sophos UTM is similar to products like pfSense
>>> <https://www.pfsense.org/>, Smoothwall <http://www.smoothwall.org/> etc).
>>>
>>> The host has 3 physical NICs which are configured on the Sophos VM as:
>>> 1) LAN (fixed IP)
>>> 2) DMZ (fixed IP)
>>> 3) WAN (which is directly plugged into a cable modem for the internet
>>> connection and is configured DHCP).
>>>
>>> I have imported the settings from the "old" Sophos machine so I know the
>>> configuration of the new one is identical to the old one. I have even tried
>>> configuring the NICs to have the same MAC addresses as the old one.
>>>
>>> The problem is that no matter what I try I cannot get the WAN NIC to get
>>> an internet link up and running with my cable modem. I have re-installed
>>> the VM countless times, turned off the modem and VM, done a factory reset
>>> of the modem, and, as I mentioned, ensured the MAC addresses are the same.
>>> Nothing I try has been successful.
>>>
>>> The network interfaces on the new Sophos VM look like this:
>>> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
>>> state UP group default qlen 1000
>>> link/ether 00:0c:29:79:d4:de brd ff:ff:ff:ff:ff:ff
>>> inet 192.168.0.254/24 brd 192.168.0.255 scope global eth0
>>> valid_lft forever preferred_lft forever
>>> 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1472 qdisc pfifo_fast
>>> state UP group default qlen 1000
>>> link/ether 00:0c:29:79:d4:e8 brd ff:ff:ff:ff:ff:ff
>>> 4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
>>> state UP group default qlen 1000
>>> link/ether 00:0c:29:79:d4:f2 brd ff:ff:ff:ff:ff:ff
>>> inet 192.168.1.254/24 brd 192.168.1.255 scope global eth2
>>> valid_lft forever preferred_lft forever
>>>
>>> I also found this in the /var/log/system.log of the Sophos VM:
>>> 2015:08:29-12:04:05 sop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255
>>> port 67 interval 6
>>> 2015:08:29-12:04:11 sop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255
>>> port 67 interval 13
>>> 2015:08:29-12:04:24 sop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255
>>> port 67 interval 2
>>> 2015:08:29-12:04:26 sop dhclient: No DHCPOFFERS received.
>>>
>>> I have shut down firewalld on the KVM host so I don't think there are any
>>> firewall rules blocking this.
>>>
>>> As soon as I fire up the original Sophos VM on ESXi the internet
>>> connection works perfectly again.
>>>
>>> If I can't get this VM running on KVM it's a show-stopper. Can anyone
>>> suggest what might be going on that is preventing the WAN link from
>>> connecting? Or suggest a way of troubleshooting this?
>>>
>>> Thanks in advance.
>>>
>>
>>
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