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

[Ajey Gore]

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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