[plug] VPN over 320U dongle

[Steve Baker]

I appreciate the tips Bill. The VPN works properly when I'm plugged into 
an ethernet cable, or wireless. The OpenVPN config, routing, and 
firewalls are all fine. It works.

When disconnect from other networks and plug in the WWAN dongle (SW 
320U), I can connect to the OpenVPN (it says it establishes the 
connection, IP and route are assigned) but no traffic will go over the 
VPN link.

I found a post somewhere that says you have to disable tls-auth when 
using OpenVPN with this dongle. (Not sure if it's the dongle's fault or 
Telstra's fault). I haven't been able to test that, and in any case I 
won't be able to disable that for the connection to the office.

Regards,
Steve


On 20/4/20 8:01 am, William Kenworthy wrote:
> have you checked:
>
> 1. firewall has been configured for the vpn (probably not here but a 
> good firewall will usually block RFC private address ranges from the 
> Internet - not what you want in this case)
>
> 2. are the routing metrics correct?
>
> 3. you can ping the far end of the tunnel (IP)
>
> 4. is openvpn is running in the same configuration both ends (that is, 
> they are compatible configurations - can give rise to what you are 
> describing) - also check out openvpn's routing gotchas networks behind 
> the vpn.
>
> BillK
>
>
> On 20/4/20 7:09 am, Steve Baker wrote:
>>
>> Unfortunately that's not it either. The OpenVPN server is in the 
>> 192.168 block, Telstra uses the 10.x block.
>>
>> My office VPN _is_ on the 10.x block, but I think it is a /24 netmask 
>> and different network address to the dongle IP address.
>>
>> Regards,
>> Steve
>>
>>
>> On 19/4/20 11:16 pm, Ian Kent wrote:
>>> On Tue, 2020-04-14 at 13:39 +0800, Steve Baker wrote:
>>>> Hi all,
>>>>
>>>> Here is another VPN question. I am using OpenVPN on my laptop to
>>>> connect
>>>> to a couple of different target networks. When I am connected to
>>>> ethernet or wireless, I have no issues. If I connect the laptop to
>>>> the
>>>> Telstra 4G Mobilenet WWAN using a Sierra Wireless 320U dongle, the
>>>> OpenVPN says that it connects fine, but it refuses to carry any
>>>> traffic.
>>> Conflict in the OpenVPN server client address range perhaps ...?
>>>
>>> I remember that an old "3" phone network used 10. range within the
>>> phone network. Might be worth checking what address gets assigned
>>> against VPN assigned addresses on working connections against what
>>> gets assigned on the WWAN connection.
>>>
>>> It might not even be obvious if the network uses a broad netmask.
>>>
>>>> If I hot-spot my phone, also on Telstra 4G, and connect the laptop
>>>> via
>>>> wireless, it all works fine.
>>>>
>>>> Apart from this issue, everything else seems to work. Web browsing
>>>> (http/https) and emailing (POP/SSL, SMTP/TLS) have no issues. I
>>>> haven't
>>>> tried other applications as I usually use those over the VPN.
>>>>
>>>> Any ideas?
>>>>
>>>> Regards,
>>>> Steve
>>
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