Packets are not properly forwarded between nodes

[imadhsissou]

GNS3 version and operating system:

• Client : GNS3 version 2.2.17 on Windows (64-bit) with Python 3.6.8 Qt 5.12.1 and PyQt 5.12.
• Server :

Describe the bug:

I can't ping between two directly linked nodes, tried XRv, IOSv and CSRv1000, all failed !

However, I noticed after troublshooting that the interface that is attached second when creating the link in GNS3 GUI doesn't send or recieve any traffic, I launched a ping from both sides, and did a packet capture on the link and I was able to see ARP Requests sourced from the interface A (attached first) but not from interface B (attached second), deleted the link and created it again, but this time starting from interface B, and I was able to see ARP Request from interface B but not from A.

I replicated the same scenario using the Web UI and noticed the same behaviour.

Images

Cisco CSR1000v 17.03.01a Cisco IOS XRv 6.3.1 Cisco IOSv 15.9(3)M2

To Reproduce

Create a simple topology with simple subnet to test a ping.

I can provide more details if needed.

UPDATE:

I'm using a remote server.

I recreated the same topology with the same images directly from the built-in Web UI in GNS3 VM Server and everything worked fine.

[imadhsissou]

I created this issue ongns3-server since I'm not really sure if this is a GUI/UI problem or it is from the server side.

[cristian-ciobanu]

Try to use diferrent interface drivers like e1000, virtio, vmxnet for your devices and test again. I think I encountered such a issue a while ago. Once I changed for example virtio to e1000 ping started to work fine, If I remember correctly.

[imadhsissou]

When I change the driver and reboot the device interfaces don't show up at all, I tried many combinations with no luck !

Everything works fine when I create the topology from the built-in Web UI, I used the same images with the same appliance settings, including network drivers.