[Solved] Can't ping windows VM

[Adithya]

Hi,
I have the following scenario:
I have a node where I have setup a windows VM:

My windows VM is able to ping the node and my local PC on the same network.
My node is able to ping my local PC but unable to ping the windows VM
My local PC is able to ping my node but unable to ping the windows VM

I have disabled firewall at all levels.
I need some help to understand why this is happening

 

[spirit]

are you really sure to have disabled the windows firewall ?

 

[Adithya]

Yes, I have disabled it at all levels (data centre, node and the VM)
In the VM, I disabled it in the firewall section and the network section

 

[spirit]

because this really sound like the default windows firewall blocking icmp by default.

you can try to tcpdump on the tap interface directly from proxmox host

#tcpdump -i tap<vmid>i0 icmp

to see if it's blocked by windows or not.

 

[Adithya]

Hi, I ran tcpdump and I got this output on the node, when I tried to ping my VM:

19:03:22.235459 IP inrd-adik.XX.XXXX.XXXXXXX.com > desktop-6qieueb.XX.XXXX.XXXXXXX.com: ICMP echo request, id 1, seq 168, length 40

But the request times out on my local PC.
I have also allowed remote access on my VM

 

[spirit]

is desktop-6qieueb.XX.XXXX.XXXXXXX.com your vm ?

if yes, that mean than icmp request is going to windows, and windows dont reply. (So it's a problem in windows, maybe filtering icmp request for in, or icmp reply for out)

 

[Adithya]

Yes, that is my VM.
I had earlier disabled firewall on VM through proxmox. I thought this would be enough, but it didn't work.

It worked only after I added inbound rules to allow ICMPv4 and ICMPv6 messages on my VM.
Thanks for the help

 

[damon1]

NOTE to myself incase it happens again
open in windows firewall
File and Printer Sharing (Echo Request - ICMPv4-In)
and/or
Core Networking Diagnostics - ICMP Echo Request (ICMPv4-In)
the latter changed in the windows update 17 Sept 2020 - Yeah Microsoft !!!!
thanks
Damon