TrueNAS Host Can't Access Services running off a Virtual Machine

[theprez]

Having a strange problem that I've spent days on. As fas as I can tell, there's something in the default setup/routing/firewall that is blocking the ability for the actual TrueNAS host to be able to access services that are running on a Virtual Machine within the same box.

Example:

TrueNAS Host:
Statically Assigned 192.168.0.100/24
DNS pointing to VM IP Address also on the 192 subnet
This machine cannot reach (ping) or get requests from the DNS server via shell nslookup even though the DNS server is correct in /etc/resolv.conf

VM Host:
Statically Assigned 192.168.0.200/24
Running DNS Server
Other LAN machines can communicate with this VM with no problem

As a workaround, if I slap another NIC into the box, point the VM to this NIC via passthrough and assign it the same IP address all works fine. However, this isn't a good long term solution and makes me wonder what other services may have difficulty being accessed between the TrueNAS host and the VM.

Any ideas what's occurring here?

A quick search found this link provided by @morganL in Nov 2021 but it's 404'ing: https://www.truenas.com/docs/scale/virtualization/accessingnasfromvm/

Thanks

 

[Samuel Tai]

Docs Hub | Accessing NAS From a VM

Accessing NAS From a VM

www.truenas.com

 

[theprez]

Docs Hub | Accessing NAS From a VM

Accessing NAS From a VM

www.truenas.com

Thanks - this resolved the issue.

Although, it opens up another question. I have a few apps running on my SCALE box... do I need to somehow modify a setting to point to the newly created bridge there also?

Thanks

 

[billxsand]

updated link

Accessing NAS From a VM

Provides instructions on how to create a bridge interface for the VM and provides Linux and Windows examples.

www.truenas.com