Net isolation

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Frakko
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Joined: 06 May 2016
Posts: 403

PostPosted: Sun Dec 20, 2020 18:09    Post subject: Net isolation Reply with quote
Good morning,
I have a netgear 7000. I proceeded to create a vlan for each of the eth ports. The first three are in "net isolation" the fourth is not. On the fourth I have a small nas server to distribute and collect my files and share them with other stations and watch videos.
Initially the configuration, thus set, allowed me to obtain the desired result. Each subnet saw only the nas and is isolated from the others. Unfortunately, the nas server on the fourth network has not been reachable for a few days. I tried on another router and the nas works fine. Was the result just random or is there something I can change to restore the situation illustrated?
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foz111
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Joined: 01 Oct 2017
Posts: 461
Location: Earth

PostPosted: Mon Dec 21, 2020 11:12    Post subject: Re: Net isolation Reply with quote
Frakko wrote:
Good morning,
I have a netgear 7000. I proceeded to create a vlan for each of the eth ports. The first three are in "net isolation" the fourth is not. On the fourth I have a small nas server to distribute and collect my files and share them with other stations and watch videos.
Initially the configuration, thus set, allowed me to obtain the desired result. Each subnet saw only the nas and is isolated from the others. Unfortunately, the nas server on the fourth network has not been reachable for a few days. I tried on another router and the nas works fine. Was the result just random or is there something I can change to restore the situation illustrated?


Not sure if qnap problem or settings issue as you have not posted any settings but you must allow ip range on qnap nas:
Go to Control Panel > System > Security > Allow/Deny List and add VPN/VAP/Vlan IP range.
SurprisedItWorks
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Joined: 04 Aug 2018
Posts: 1196
Location: Appalachian mountains, USA

PostPosted: Mon Dec 21, 2020 16:48    Post subject: Reply with quote
Double check that the devices on the first three vlans cannot see each other, because unless something has changed in recent builds after years of this problem, "net isolation" only isolates a subnet from br0. They are not isolated from each other. To get the latter isolation requires custom iptables commands. The easiest way to check this out is to look carefully through the output of iptables -vnL FORWARD to find and examine the net-isolation rules.
_________________
Five WRT1900ACSv2's on 44048, 46069, 46816: VLANs, VAPs, NAS, client mode, OpenVPN client (AirVPN), DDNS, wireguard servers and clients (AzireVPN), two DNSCrypt DNS providers (incl Quad9) via OpenVPN/wireguard clients.
Frakko
DD-WRT User


Joined: 06 May 2016
Posts: 403

PostPosted: Fri Dec 25, 2020 9:50    Post subject: Reply with quote
The NAS server has started working regularly again being reachable from the various LANs. I did some tests. The various Vlan, without modification, seem isolated from each other. Smile I did the tests with the Firmware version: DD-WRT v3.0-r45073 std (12/21/20). In practice, as the problem had arisen, it has now disappeared. Better that way.
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