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

[Zach Villers]

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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