AWS linux BAC0 openvpn client

[jetran01]

Hi @ChristianTremblay

Have you ever encounter error 99 (cannot reach network) when trying to create a bacnet network on a tun0 adapter (openvpn client IP) in ubuntu 20.04?

I can just replicate this issue in an AWS instance with ubuntu 20.04 installed. In W10 in my local PC works perfectly fine with openvpn client.

Any hint? BR

[jetran01]

Hi @ChristianTremblay Seems like the problem isn't AWS but just ubuntu 20.04 since i could reproduce the error in a VM with the same OS.

BR

[jetran01]

Hi @ChristianTremblay

There is some kind of incompatibility between openvpn 2.5 on ubuntu 20.04 and BAC0 (laste version). (It works fine on W10)

Does this has been reported? Do you have any similar cases?

[jetran01]

Error detected

python3 Python 3.6.9 (default, Mar 15 2022, 13:55:28) [GCC 8.4.0] on linux Type "help", "copyright", "credits" or "license" for more information. import BAC0 bacnet=BAC0.lite('10.8.0.6') 2022-05-18 13:32:17,087 - INFO | Starting BAC0 version 21.12.03 (Lite) 2022-05-18 13:32:17,087 - INFO | Use BAC0.log_level to adjust verbosity of the app. 2022-05-18 13:32:17,087 - INFO | Ex. BAC0.log_level('silence') or BAC0.log_level('error') 2022-05-18 13:32:17,087 - INFO | Starting TaskManager 2022-05-18 13:32:17,089 - INFO | Using ip : 10.8.0.6 2022-05-18 13:32:17,107 - ERROR | an error has occurred: [Errno 99] Cannot assign requested address Traceback (most recent call last): File "/usr/local/lib/python3.6/dist-packages/BAC0/scripts/Base.py", line 235, in startApp subscription_contexts=self.subscription_contexts, File "/usr/local/lib/python3.6/dist-packages/BAC0/core/app/ScriptApplication.py", line 217, in init self.mux = UDPMultiplexer(self.localAddress) File "/usr/local/lib/python3.6/dist-packages/bacpypes/bvllservice.py", line 102, in init self.broadcastPort = UDPDirector(self.addrBroadcastTuple, reuse=True) File "/usr/local/lib/python3.6/dist-packages/bacpypes/udp.py", line 155, in init self.bind(address) File "/usr/lib/python3.6/asyncore.py", line 329, in bind return self.socket.bind(addr) OSError: [Errno 99] Cannot assign requested address

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/usr/local/lib/python3.6/dist-packages/BAC0/scripts/Base.py", line 177, in init self.startApp() File "/usr/local/lib/python3.6/dist-packages/BAC0/scripts/Base.py", line 250, in startApp raise InitializationError("Error starting app: {}".format(error)) BAC0.core.io.IOExceptions.InitializationError: Error starting app: [Errno 99] Cannot assign requested address

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python3.6/dist-packages/BAC0/scripts/Lite.py", line 158, in init **params File "/usr/local/lib/python3.6/dist-packages/BAC0/scripts/Base.py", line 180, in init "Gros probleme : {}. Address requested : {}".format(error, localIPAddr) BAC0.core.io.IOExceptions.InitializationError: Gros probleme : Error starting app: [Errno 99] Cannot assign requested address. Address requested : 10.8.0.6

[ChristianTremblay]

This is new material for me. I work a lot with OpenVPN but in Windows and it works all the time.

[SteffenBraeunig]

In a docker environment (host: ubuntu:20.04) I had exactly the same problem. In a local development environment (w10) it works fine. Example: client = BAC0.lite(). If I put the app into a docker image (base is python:3.10.5-slim), I get the following output:

2022-07-15 11:48:02,751 - INFO - Lite:init(151) - Using ip : 172.17.0.2 2022-07-15 11:48:02,751 - DEBUG - Base:init(116) - Configurating app 2022-07-15 11:48:02,768 - DEBUG - Base:init(121) - To be able to run the web server, you must install pandas, bokeh, flask and flask_bootstrap 2022-07-15 11:48:02,768 - DEBUG - Base:init(124) - Those are not all installed so BAC0 will work in Lite mode only. 2022-07-15 11:48:02,768 - DEBUG - Base:startApp(188) - Create Local Device 2022-07-15 11:48:02,769 - DEBUG - Discover:_iam_request(248) - - request: <bacpypes.apdu.IAmRequest(0) instance at 0x7fa74ab2bf40> 2022-07-15 11:48:02,770 - ERROR - Base:startApp(249) - an error has occurred: [Errno 99] Cannot assign requested address 2022-07-15 11:48:02,770 - DEBUG - Base:startApp(252) - finally 2022-07-15 11:48:02,770 - ERROR - app:handle_exception(32) - Gros probleme : Error starting app: [Errno 99] Cannot assign requested address. Address requested : 172.17.0.2 Traceback (most recent call last): File "/usr/local/lib/python3.10/site-packages/BAC0/scripts/Base.py", line 231, in startApp self.this_application = BAC0Application( File "/usr/local/lib/python3.10/site-packages/BAC0/core/app/ScriptApplication.py", line 217, in init self.mux = UDPMultiplexer(self.localAddress) File "/usr/local/lib/python3.10/site-packages/bacpypes/bvllservice.py", line 102, in init self.broadcastPort = UDPDirector(self.addrBroadcastTuple, reuse=True) File "/usr/local/lib/python3.10/site-packages/bacpypes/udp.py", line 155, in init self.bind(address) File "/usr/local/lib/python3.10/asyncore.py", line 333, in bind return self.socket.bind(addr) OSError: [Errno 99] Cannot assign requested address

My solution is to determine the current ip address and set the ip address and port for bbmdAddress (BACnet Broadcast Management Device) (see https://bac0.readthedocs.io/en/latest/connect.html#define-a-bacnet-network):

client = BAC0.lite(ip=local_ip, bbmdAddress=local_ip+':47808', bbmdTTL=900)

It works local and in a docker container.

[jetran01]

this adress "172.17.0.2" match the address of your docker or the one your vpn is giving you?

try using BACO.lite("xxx.xxx.xxx.xxx") #being xxx.xxx.xxx.xxx your actual ip (you can input it manually or automatically using a python library)

[SteffenBraeunig]

@jetran01

"172.17.0.2" is the dynamic lokal ip address of the running docker container. Maybe it helps you with the vpn problem.

def __get_ip(self):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s.connect(("8.8.8.8", 80))
    ip, port = s.getsockname()
    return ip

[jetran01]

oh sorry yeap i think i misunderstood your previous comment. My final solution was to avoid the issue and use a W10 server. The linux compatibility issue was imposible to figure out for me.

My issue was related with openvpn in linux with other vpns didn't happend

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