Node-red-node-email not sending email on double nat network

General
1

Which node are you reporting an issue on?

node-red-node-email

What are the steps to reproduce?

double nat your network
send an email using the node

What happens?

I get the following error:
Error: connect ENETUNREACH 2404:6800:4003:c11::6c:465 - Local (:::0)

What do you expect to happen?

I expect that the email will be sent to the addressee

It was working before I double nat'ed my network

Please tell us about your environment:

Node-RED version : 3.0.0
NodeJS version: 14.19.3
npm version: 6.14.17
node-red-node-email version 1.17.0
OS version: Raspbian 11 (bullseye)
Browser: Edge

Any help to understand the relation between the error and the network being double 'natted' will greatly help.

Regards,
Anand.

2

Double NAT should not prevent the sending of e-mail. Can you ping the email server from the machine running NodeRed?
The error code I think is related to DNS failure.

Many networks are now double NAT, mostly because IPv4's are running out so service providers are running CG-NAT. Make sure it's not a DNS issue locally on your network, point to point.

3

Thanks for your suggestions.

I was able to successfully ping the email server from the Rpi running NodeRed.

I was also able to ping the DNS server as well. So, this ruled out issues with DNS etc.

I was told that the problem might be related to my machine using IPv6 addresses instead of iPv4, so I have now disabled IPv6 from the Rpi by adding " ipv6.disable=1" to the file: /boot/cmdline.txt

After doing this, ifconfig stops showing the IPv6 address and the problem seems to have resolved itself for the moment.

I am not sure if this is the right thing to do?

I am very new to both the Rpi and Linux so any suggestions on a better way to address this issue would be very helpful.

4

Yes, it is. Even after all these years many things fail hard over IPv6.

1 Like
5

I am now getting a new error

Error: getaddrinfo EAI_AGAIN smtp.gmail.com

This occurs after disabling IP6 as described in my earlier post.

So, it looks like I'm stuck.

If I enable IP6, I am unable to even get to the smtp server.

If I disable IP6, I am now running into the error shown above in this post.

Not sure how to proceed so any help would be greatly appreciated.

Regards,
Anand.

6

Can you still ping smtp.gmail.com?

7

No, I am unable to ping anything.

I get the following error:

ping: socket: Address family not supported by protocol

8

Does this work
ping -4 smtp.gmail.com
This problem is nothing to do with node-red of course.

9

ping -4 smtp.gmail.com also doesn't work

I have now re-installed the OS and node-red and all seems to be in order.

Thanks for your help

10

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.