Could not connect to machines created from the dashboard using mycelium on windows

[khaledyoussef24]

Description :

while testing Mycelium on Windows and Myceloumflut

Mycelium worked fine on Windows. I could easily ping Mycelium using ping -6 <mycelium_ip> and communicate with other machines having mycelium installed and the binary running :

but could not do the same to machines deployed from the grid from windows

[LeeSmet]

Can you try to ping the IP instead of trying to ssh to it?

[khaledyoussef24]

@LeeSmet pinging ips works fine with me

[LeeSmet]

Given that ping works fine, this indicates that mycelium itself seems to be functioning as expected and delivers packets. Connection timed out would suggest then that the tcp connection handshake, or later ssh connection handshake doesn't complete, i.e. packets are lost/dropped. I'd suggest to try and ssh to the machine using another transport (regular ipv6/public ipv4 if that is available/wireguard). If that works, check if there are firewall rules and what those are, if the ssh server is listening on addresses which include the mycelium interface, and if there is nothing there, tcpdump the mycelium interface to see if any packets actually do come in for the ssh connection

[iwanbk]

Mycelium worked fine on Windows but could not do the same to machines deployed from the grid from windows

Hi @khaledyoussef24 Could you try to change Windows with other OS, like Linux or macos with mycelium binary from this repo (not from myceliumflut repo)

[khaledyoussef24]

Working fine on both linux and macos

And has the abiltiy to connect to machines with mycelium created on the grid

[iwanbk]

OK, i can reproduce it, using command line mycelium, not the flutter one.

Did few scenarios

1. windows to Linux(my PC)

• ping OK
• ssh OK

2.Linux (my PC) to Linux on grid

• ping OK
• SSH OK

3. Windows to Linux on grid

• ping OK
• ssh : failed

ssh: connect to host 4d3:395f:77d0:e398:ff0f:0:400:2 port 22: Connection timed out

4. flutter macos to Linux on grid:

• ping: OK
• ssh : OK

[iwanbk]

I got the error log

thread 'tokio-runtime-worker' panicked at C:\Users\Administrator\mycelium\mycelium\src\tun\windows.rs:64:40:
range end index 1452 out of range for slice of length 1400
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

And found that max packet size and MTU are 1400 instead of 1500. Sent the fix on #484

[khaledyoussef24]

myceliumflut latest version made by Iwan worked fine and while running the app ,I could connect to machines on the grid using mycelium ip

[khaledyoussef24]

It was using myceliumflut. shall we consider this as done ?

[iwanbk]

shall we consider this as done ?

It will be done after #485 getting merged.

The binary i sent to you is a PoC of this solution.