[colug-432] Issues with Routing under KVM / OpenVPN

[Joshua Kramer]

Here's the network setup:
1. A virtual network named 'locservers' with the range 192.168.4.0/24
and the device virbr2
2. Under Network Interfaces, the device virbr2 has the address
192.168.4.1 (this is the KVM host)
3. On the virbr2 network interface, there are a number of slave
interfaces.  One of those slave interfaces is vnet1, and its MAC
address corresponds to eth0 MAC address on the VPN server.

On Tue, May 16, 2017 at 9:13 PM, Zach Villers <zachvatwork at gmail.com> wrote:
> Hi Joshua,
>
> I read through a couple of times, but didn't see how the KVM network
> adapters were configured?
>
> --
>   Zach Villers
>   zach at znix.site
>
> On Tue, May 16, 2017, at 09:11 PM, Zach Villers wrote:
>> Hi Joshua,
>>
>> I read through a couple of times, but didn't see how the KVM network
>> adapters were configured?
>>
>> --
>>   Zach Villers
>>   zach at znix.site
>>
>> On Tue, May 16, 2017, at 08:11 PM, Joshua Kramer wrote:
>> > Hello,
>> >
>> > I'm trying to figure out a routing issue involving a set of servers I
>> > have under KVM as well as OpenVPN.
>> >
>> > The servers are under a private network, 192.168.4.0/24 ... there are
>> > no physical interfaces on the .4 network- it's all internal to KVM.
>> >
>> > I would like to have devices on the internet (i.e. my phone) be able
>> > to access the servers I have on the .4 network.  So, I have one
>> > OpenVPN VM on the .4 network.  My modem/router will forward inbound
>> > connections for the OVPN port to this VM.
>> >
>> > I set up OVPN in routing mode.  I gave the external devices a *.6/24
>> > network.  The tun0 interface set up via OVPN has an address of
>> > 192.168.6.1.  I connect to the OVPN server from outside of the network
>> > using my cell phone over the cellular connection.  The OVPN client on
>> > the phone gives it an address of 192.168.6.2.
>> >
>> > The underlying hardware host has the address 192.168.4.1.  The OVPN
>> > server is on  192.168.4.34. I set up the routing on the hardware like
>> > this:
>> >
>> > route add -net 192.168.6.0 netmask 255.255.255.0 gw 192.168.4.34
>> >
>> > Something is not working with that route.  If I get on another VM that
>> > is on the .4 network and do a traceroute to 192.168.6.1, I get the
>> > following.  It should show a hop to 192.168.4.34 but it does not.
>> >
>> > traceroute to 192.168.6.1 (192.168.6.1), 30 hops max, 60 byte packets
>> >  1  192.168.4.1 (192.168.4.1)  0.162 ms  0.080 ms  0.076 ms
>> >  2  192.168.6.1 (192.168.6.1)  0.499 ms !X  0.223 ms !X  0.134 ms !X
>> >
>> > What am I missing?  The hardware host is misconfigured in some way and
>> > I am having difficulty determining where.  CentOS 7 runs on all hosts
>> > and VM's.
>> >
>> > Thanks!
>> > -JK
>> > _______________________________________________
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>> > colug-432 at colug.net
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