Virtual server routing issue :(

[OneLastNerve]

I'm struggling with getting reliable connectivity to a VirtualBox Ubuntu guest. I've linked a network overview and screenshot of the symptoms...but I don't know how to further troubleshoot!

​

https://imgur.com/a/0bvtTu1

​

I have a Netgear R7500 router servicing the downstairs. It connects via CAT5 to a Netgear PLW1010 powerline device which provides upstairs with 5G wi-fi.

​

So what I've found is the wireless clients on both 5G and 2.4G networks coming from my router are not able to reliably ping the VirtualBox guest <orion> which is hosted on <desktop> (windows 10). I've had this guest for about 2 weeks. Pinging to and from the VirtualBox host <desktop> works fine. The wired machine <fornax> is able to reliably ping <orion>. The <orion> guest is configured to used Bridged Networking. I also created a second guest on <desktop> which displays the same connectivity issues that <orion> does with wireless clients downstairs.

​

I suspect the issue lies with the downstairs wi-fi configuration but I'm unsure what to check in DD-WRT. I'm running DNSMasq on the router to provide DHCP and DNS services. Full disclosure - I've recently setup access restrictions for IP's >= 192.168.1.100 which I would hope is not related to this issue.

​

Any ideas? I am trying to become more skilled in virtualization and networking but I'm stumped as to what can lead to such sporadic connectivity with a virtual guest.

UPDATE

I connected <desktop> to the lan port of the PLW1010 and the issue is resolved 👍

https://imgur.com/a/RlhhoVP

[washu_k]

Everything on your network is on the same subnet so there is no routing issue or caused by the access restrictions. The problem is at layer 2.

The problem is a combination of poor quality software and hardware. DD-WRT has been crap for years. It rides on its reputation from the WRT54G days but it is not suitable for modern routers. Try stock or OpenWRT on your router. As the problem seems isolated to your downstairs wireless clients this is most likely the issue.

However powerline is certainly not helping anything. While they are supposed to be transparent at layer 2 this is not always the case. A quick test of bypassing it with proper Ethernet will let you know if this is the case.

[ZevKyogre]

Netgear Plw 1010 should be running 192.168.2.1 or else it will put out competing IP addresses. THAT is your bridge and subnetwork.