FabulaTech Forum - Port forwarding does not work for multi-dnat chain

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FabulaTech Forum USB Solutions USB over Network (Moderators: Tim_GaliullinFT, Sergey_Jarovski, Andrew) Port forwarding does not work for multi-dnat chain

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Topic: Port forwarding does not work for multi-dnat chain (Read 4416 times)

John_edwards
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Port forwarding does not work for multi-dnat chain
on: Jul 20^th, 2017, 10:17pm

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Hi!
I am trying to get the software work to pass through USB device from physical Windows XP host into VM

The result is that there is a chain of "machines" involved

host 2 has a physical NIC passed through to it to make connection to USBNetServer (physical box)

[USB-recipient-VM]==[DNAT-to-host1]==>host1==[DNAT-to-host2]==>host 2==[DNAT-to-USBNetServer]==>USBNetServer

The server plain does not see the connection.

However, if I passthrough the NIC to host 1 and use host one as gateway it works

[USB-recipient-VM]===>host1 (as gateway)==[DNAT-to-USBNetServer]==>USBNetServer

Somehow, adding a +1 machine breaks it.

It is definitely not a latency thing (NICs in QubesOS are super fast)

Does Fabulatech's protocol take notice of source and destination IPs (which don't match the ones specified in case of a long DNAT chain)?

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Sergey_Jarovski
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Re: Port forwarding does not work for multi-dnat c
Reply #1 on: Jul 21^st, 2017, 2:11pm

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Hi,
Thanks for the interest in our products and for your request.
Your question is related to the network routing.
You must have:
- route between server and client;
- available TCP port on both sides.

Last Edit: Jul 21^st, 2017, 2:12pm by Sergey_Jarovski

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Sergey Jarovski

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John_edwards
FabulaTech Forum Newbie

Posts: 3

Re: Port forwarding does not work for multi-dnat c
Reply #2 on: Jul 23^rd, 2017, 11:42am

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Hi! Thanks for prompt reply!

I do seem to have both route and port, as indicated by:

pings going through without issue

the network client seeing the remote device and connecting to it.

HOWEVER, in the "long route" scenario, connectivity issues arise as if packets are being partially lost or something

Symptoms:
If I share a printer in the "long route" scenario, printer is seen by client and can be connected, but about 2-3 pages in, it resets and reports being offline (waiting for device message in client)

In "short route" scenario no such problem exists and client connects / prints flawlessly

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Sergey_Jarovski
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Re: Port forwarding does not work for multi-dnat c
Reply #3 on: Jul 24^th, 2017, 8:33am

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Hi again,
Please let me know the value of the network latency in both cases ("long/short route" scenario).

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Sergey Jarovski

FabulaTech
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http://www.fabulatech.com

John_edwards
FabulaTech Forum Newbie

Posts: 3

Re: Port forwarding does not work for multi-dnat c
Reply #4 on: Jul 24^th, 2017, 9:35am

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ping time < 50 ms in "short" route

ping time < 65 ms on "long" route

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Sergey_Jarovski
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Re: Port forwarding does not work for multi-dnat c
Reply #5 on: Jul 24^th, 2017, 10:23am

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Hi again,

We need to have the logs from both sides (server/client) for both situations:
1) server log and client log for "long route" scenario;
2) server log and client log for "short route" scenario.
You can find the needed instructions here ("If there is a bug with the functionality of our software, do the following" section):
https://www.fabulatech.com/usb-over-network-server-help/troubleshooting-server.html
https://www.fabulatech.com/usb-over-network-client-help/troubleshooting-client.html
Zip these 4 logs and send to support@fabulatech.com.

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Sergey Jarovski

FabulaTech
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http://www.fabulatech.com

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