Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

89 posts

Master Geek

#245589 12-Feb-2019 08:40
Send private message

Hi all
Not sure where I'd put arduino related threads on this forum, but because its networking related, this seems the best place.

Im having a odd problem with my NodeMCU's

I recently updated my firewall and my script stopped working, I found that I had accidentally turned off ping between vlans. I allowed ICMP which is usually what ping runs over, but it still appears to be blocked.
So posting on another forum we got to the point where we know its the arduino having issues and not the firewall its self.

Turned on logging on firewall and noticed the following actions:

Ping router from Arduino - See the requests in firewall & arduino gets response. (Red line)
Send external web request from arduino - See requests in firewall & arduino gets response. (Orange Line)
Send web request to internal server - Arduino queries internal DNS and gets IP of web server, but no request send (Nothing in firewall logs) (Yellow and Blue)
Send ping to internal server - Arduino queries same dns server, gets ip, but no request sent (Firewall logs again) (Yellow and Green)

however, sending the ping and web request from desktop, shows both the firewall log blocking the ping request, and the rule allowing the web request.(Brown Purple Pink)

Have attached diagram again to help visualize whats going on
And can attach router logs or rules if required

Also have set a windows PC with the same IP address, and can ping the web server, so I know it's something wrong with the arduino's requests to the web server in particular, and not the firewall?

So for some reason, when doing any network traffic to that particular vlan / subnet from the arduino it wont send the requests.
Other devices with the same IP work fine, and other subnets / vlans work fine, just that particular range?

Things I am going to try tonight after work are
- Try a different IP on that subnet to see if its the IP or the range thats having issues.
- Try a wireshark capture to see if I can see the traffic on the LAN, then see if I can see any issues with the packets.

Create new topic
3107 posts

Uber Geek

Lifetime subscriber

  #2177295 12-Feb-2019 19:11
Send private message

What code are you running? I would try posting into the nodemcu or whoever provides the code and libraries that you are running and ask them.
I've never had a problem with Homie on my ESP-01 and on my other micro controllers.


Create new topic

Twitter and LinkedIn »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

OPPO Find X2 Lite brings flagship features to mid-range 5G smartphone
Posted 29-May-2020 12:52

Sony introduces the digital camera ZV-1 for content creators
Posted 27-May-2020 12:47

Samsung Announces 2020 QLED TV Range
Posted 20-May-2020 16:29

D-Link A/NZ launches AI-Powered body temperature measuring system
Posted 20-May-2020 16:22

NortonLifeLock Online Banking Protection now available for New Zealand banks
Posted 20-May-2020 16:14

SD Express delivers new gigabyte speeds for SD memory cards
Posted 20-May-2020 15:00

D-Link A/NZ launches Nuclias cloud managed network solution hosted in Australia
Posted 11-May-2020 17:53

Logitech introduces new video streaming solution for home studios
Posted 11-May-2020 17:48

Next generation Volvo cars to be powered by Luminar LiDAR technology
Posted 7-May-2020 13:56

D-Link A/NZ launches Wi-Fi Certified EasyMesh system
Posted 7-May-2020 13:51

Spark teams up with Microsoft to bring Xbox All Access to New Zealand
Posted 7-May-2020 13:01

Microsoft plans to establish its first datacenter region in New Zealand
Posted 6-May-2020 11:35

Genesis School-gen has joined forces with Mind Lab Kids
Posted 1-May-2020 12:53

Malwarebytes expands into privacy with fast, frictionless VPN
Posted 30-Apr-2020 16:06

Kordia to donate TV airtime on Channel 200 to community groups
Posted 30-Apr-2020 16:00

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.