I have a python script (using pysnmp lib) running on a real device with Ubuntu 14.04 LTS which do internal polling. It sends keepalives and SNMPv3 Traps to Nagios. Snmptrapd is receiving traps and passing it to Snmptt, which works very well.
Ive been trying the same scenario in VirtualBox with same distr. Ubuntu 14.04
but on Nagios side all the Time i get
snmptrapd[7540]: Authentication failed for hostname
I couldnt figure out what is the problem. Capturing with Wireshark, i can see both packets are coming in, from the real host and virtualbox guesthost. With createUser derivative, i add two users with same engineId,SHA and AES encryp but only keepalives as well as SNMPv3 Traps from Real Host are logged and past to SNMPTT but not from VirtualBox.
Is there anything iam missing ?
Any suggestions are highly appreciated.
Try this:
disableAuthorization yes
in the /etc/sysconfig/snmptrapd.conf on nagios.
Related
I'm using Python 3.8.5 currently on windows, but the script should run also on linux and on macOS.
I'm creating UDP server and a client and have establish communication between them via multicast.
The client does not know from advanced the IP of the server so it is a "discovery tool" that will let me know information about the server ones it has received the data. -This is working-
On the server I'm using netifaces to get information about the interfaces.
The server sends information to the client such as IP address, mask, gateway. -information that I get from netifaces and is working-.
Example of data I get:
Now to the issue:
The python server can have a static IP or can be connected to a DHCP server -in case that is connected to a DHCP server I will not have access to the DHCP server-.
I wish to know when the DHCP is enabled or disable on the python server so I can send this as a flag to the client together with the rest of the information.
The idea is for the client to know that the IP that he's connecting to can change and he may lose connection and will need to start the discovery tool once more.
Because the user will not know in advanced if the python server is connected to a DHCP server or wil know the IP address of the python server or have access to the python server command line or configuration, using ip addr show, ipconfig, ifconfig and other commands before connecting is not an option.
I have seen that people use scrapy for DHCP communications but it seems that it does not solves what I wish to accomplish.
I do no need to configure the DHCP, just detect if my python server IP is static or dynamic.
I have search for over 4 days and have not found a possible solution.
I'm not asking to have the solution in silver spoon just to be pointed on the right direction.
**EDIT: I forgot to mention that the python server will be running on Ubuntu 16.04 and 20.04.
This will depend on your operating system setup. For example, here's a related question on how to detect whether DHCP is enabled in Ubuntu.
Im very new to network programming and faced a following problem:
Im working on VMware CentOS7 virtual machine on Windows10 host.
My script should send WHOIS queries and parse their output (e.g. expiration date).
However, an attempt to send a query leads to a connection error:
>>>import whois
>>>whois.query('google.com')
WhoisCommandFailed: connect: Network is unreachable
I tried to whois from terminal, but error was the same.
When i tried to use whois directly from Windows, which hosts virtual machine, the error seemed to look same as well (connection timeout).
As i found out, it was most likely related to access to port 43. I created rules (for in and out) for Windows firewall for this port by a guide , but error still persisted.
It looks like access to this port was blocked by ISP (however ping command is working).
To sum up, I got two questions there:
1) (less important) How to check if port 43 is blocked by firewall either by ISP?
2) (most important) Is it possible somehow to reconfigure WHOIS for usage of another port (i.e. 23) for sending queries by Python script?
Unfortunately, ISP security policy doesn't allow them to open 43 port.
Mostly ISP doesn't block any port but yes, this is not 100% true.
Testing connection:
run tcpdump (install command: yum install tcpdump) command on CentOS: tcpdump -peni any tcp and port 43
You have to see lines with the following text: 192.168.1.1.57350 > 192.34.234.30.43 where 192.34.234.30 IP address means the remote whois server.
Try to telnet to remote server's TCP/43 port: telnet 192.34.234.30 43
You should see the following:
Trying 192.34.234.30...
Connected to 192.34.234.30.
Escape character is '^]'.
If you can`t see context like that and you get back prompt immediately you will a firewall rule somewhere what is block connection. I recommend to switch off firewall temporarily and test again.
You cannot change port number, because it is configured on the remote side, on the server.
Can CentOS7 server communicate towards the internet? In example can you install packages?
Is there any router between windows machine and ISP?
I am developing a Chromecast app and currently host it locally for development purpose.
It used to work fine when I had an internal ip set as my receiver url (http://192.168.1.167:9000/receiver.html) and hosted a server on my Windows machine using
python -m http.server 9000.
Now my laptop broke and I'm working on a mac mini (also because i was going to develop an iOS sender app for my receiver anyway) so I'm trying to get the receiver hosted on the mac mini.
I'm using the same principe, internal ip of the mac-mini set as receiver url, started a server using
Python -m SimpleHTTPServer 9000.
When I try to connect to my receiver, I can't get it to load.
The Chromecast displays:
Cannot load sources (or some other english equivalent of my dutch error: 'De bronnen kunnen niet geladen worden'.)
I forwarded a port in my router to my receiver and I can reach it from outside my own network (mobile 4g), I can reach it internally, colleagues can reach it, it's just the Chromecast which somehow refuses to load the page and I can't figure out why.
The Android SDK gives me CastStatusCode.CANCELED and iOS SDK GCKErrorCodeCancelled.
I also tried to update Python to the latest version, but it didn't fix it.
The Chromecast loads other apps fine, I can ping to the Chromecast and to my devices. When the Chromecast attempts to load the app, I can briefly load the debugger but it doesn't display anything in either network or console.
I hope someone has had a similair issue or any clue on how I can get the Chromecast to connect to my server again.
Of all the things i tried the last couple of hours, I didn't think of the basic 'Have you tried rebooting it'....
Cause was firmware update...
I have a NodeJS-socketIO server that has clients listening from JS, PHP & Python. It works like a charm when the communication happens over plain HTTP/WS channel.
Now, when i try to secure this communication, the websocket transport is not working anymore. It falls back to xhr-polling(long polling) transport. Xhr-polling still works for JS client but not on python which purely depends on socket transport.
Things i tried:
On node, Using https(with commercial certificates) instead of http - Works good for serving pages via Node but not for socketIO
Proxy via HAProxy (1.15-dev19). From HTTPS(HAProxy) to HTTP(Node). Couldn't get Websocket transport working and it falls back to xhr-polling on JS. Python gets 502 on handshake.
Proxy via STunnel (for HTTPS) -> HAProxy(Websocket Proxy) -> Node(SocketIO) - This doesnt work either. Python client still gets 502 on handshake.
Proxy via Stunnel(HTTPS) -> Node(SocketIO) - This doesnt work too. Not sure if STunnel support websocket proxy
node-http-proxy : Throws 500(An error has occurred: {"code":"ECONNRESET"}) on websocket and falls back to xhr-polling
Im sure its a common use case and there is a solution exist. Would really appreciate any help.
Thanks in advance!
My case seems to be a rare one. I built this whole environment on a EC2 instance based on Amazon Linux. As almost all the yum packages are not up to date, i had to install pretty much every yum packages from source. By doing so i could have missed configuration unchanged/added. Or HAProxy required lib could have been not the latest.
In any case, i tried building the environment again on ubuntu 12.04 based EC2 instance. HAProxy worked like a charm with a bit of configuration tweaks. I can now connect my SocketIO server from JS, Python & PHP over SSL without any problem. I could also create a Secured TCP Amazon ELB that listens on 443 and proxy it to non-standard port (8xxx).
Let me know if anyone else encounters a similar problem, I will be happy to help!
I can't seem to figure this out. I created a new Ubuntu VM on Azure and I can SSH into it. I installed Node (which I've done many times) and I tried to run the test app from nodejs.org:
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');
However, when I go to the IP (which is the same one I SSHed into the box from) + :1337 it just never loads. I tried :80 too, but still no luck. I also tried running python -m SimpleHTTPServer on :8000 and I still can't view the site. I must be missing something.
Just so you know, I'm just trying to setup a simple dev box with a bunch of projects on it. I want to be able to work on my projects anywhere. Some are 100% front-end JS projects so SimpleHTTPServer would be fine. Some are Node projects too. In either case, I just want to be able to hit some port and see what I'm working on.
Oh also I opened up the Azure firewall to the VM, redirecting traffic from port 80 to port 1337 (https://www.evernote.com/shard/s5/sh/3aef8e76-04f6-48cb-84f9-32462bc425a7/f0cd749773a9d09cee66d00fe3e707c0)
You are listening loopback ip address. Try .listen(1337, '0.0.0.0'); to listen on all network interfaces
urgh azure. i cannot get port 80 open. is it the machine iptables?? some azure magical thing.
i know it cant be that hard.
unlike your view i do not see 'NONE' for load balancer. i see '--'/ whatever that means.