Same Hostname on multiple VLANs

MrGcGamer · November 22, 2025, 1:12pm

Does anyone have some intel on this?
@_bernd maybe?

timur.davletshin · November 22, 2025, 1:36pm

Just curious. What's the OS which uses DHCPv6 NTP option to configure its time servers?

Why don't we use it instead of non-standard lan? Is it just because it's ugly?

timur.davletshin · November 22, 2025, 2:47pm

... and lan is not. That was the reason I was asking. I use home.arpa too.

_bernd · November 22, 2025, 3:06pm

Yes I was just awake again and miss read it.

There was a discussion here in the forum too about it and most people say it's to much to type or what not. I have hostnames mostly in config files and ssh has tab completion so that's no issue for me and yes I like it that it's reserved by iana.

MrGcGamer · November 22, 2025, 4:28pm

where is that in the configs you sent above?
Is it the stuff in /etc/dnsmasq.conf?

MrGcGamer · November 22, 2025, 4:31pm

Can dnsmasq also do PPPoE or do I still need to keep odhcpd around for that?
Looking at the installed software and the running procs, it seems that I can uninstall odhcpd-ipv6only but need to keep odhcp6c around for PPPoE

_bernd · November 22, 2025, 5:37pm

Please read carefully.
One is a Client: odhpdc,
The other is a daemon: odhcpd and odhcp6d.

Yes for PPPoE and other DHCP shizzle the router needs a dhcp-client.

_bernd · November 22, 2025, 9:27pm

Maybe it's also good to not only cross reference the openwrt wiki, but the upstream doc directly too.

https://thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html

And search for --server.

Responding in native tongue is only done if we had have hit really hard language barriers already. We try to have the outcome as accessable as possible.

wilsonyan · November 23, 2025, 10:14am

just throwing in this esoteric answer

Like for a few issues, there seems to be the ‘just run multiple instances of openwrt’ (somehow) option, i’ve recently been playing with running Openwrt in kvm/libvirt/qemu and it was a little bit of a pain but it seems to work pretty well. Granted i’ve done it on an x86 platform but the Pi 5 may be powerful enough for it, again i’m not advocating this, just putting it there. If you can get the host distro up to some kind of basic desktop you can use virt-manager to set up the vms, i’m not sure if the PI 5 has an iommu, but if it does you can even set up nic passthroughs and things like this, then you can set them to come up on boot or arrange them to start when you like with virsh, like from rc.local or some such.

_bernd · November 23, 2025, 10:50am

Did you read and understood anything in this thread at all?

We are talking about multiple instances of dnsmasq on a single OpenWrt. No virt, no container. Only build in ujail. It has nothing to do with the CPU Arch at all.

wilsonyan · November 23, 2025, 10:55am

I admitted the post was a very unorthodox way to potentially solve the problem, you ask me if I read, i’d ask you the same. If you feel the post is that inappropriate and somehow stops the problem getting solved by all means delete my post and this one I guess.

_bernd · November 23, 2025, 12:45pm

It's not about solving or not.... It's about that we are talking about process instances and you come from the side with virtualization and multiple OpenWrt instances. I don't see why this would be necessary.

And what is unorthodox to use the standard tools?
Ujail is part since I don't know 2 years.

And Luci is incomplete from the beginning and unable to configure everything which is possible to configure with uci directly and even uci sometimes has limits and that's is when you use direct configuration.

Ps and tools.like virsh are nowhere intended for any kind of usage in production. They have there place and are good for one shoot vms and such but please do not use them for infrastructure where you rely on that they are running as intended.

MrGcGamer · November 25, 2025, 9:50am

How did you get dnsmasq-full to provide IPv6 adresses to the clients.. with odhcpd disabled and dnsmasq-full installed, my clients don't get IPv6 addresses anymore

_bernd · November 25, 2025, 11:56am

In each vlan stanza you need.

_bernd:

    option  dhcpv6              'server'
    list    dhcp_option         'option6:dns-server, [fde6:a09a:b373:10::1]'
    list    dhcp_option         'option6:domain-search, net.mgmt.home.arpa.'
    option  leasetime           '12h'
    option  logdhcp             '1'
    option  ra                  'server'
    option  ra_slaac            '1'
    option  ra_useleasetime     '1'
    list    ra_flags            'managed-config'
    list    ra_flags            'other-config'

wilsonyan · January 15, 2026, 1:26am

Well it was about solving to me, someone had a problem I suggested a potential solution. That’s it. I understand why it could be seen as… I don’t know, annoying for someone to suggest it maybe but that wasn’t my intent.

I assume you mean don’t use libvirt ? Which uses qemu / kvm. All of this stuff has been in development for decades now. I get what you’re saying, but it’s a bit like saying “use a cisco or juniper router” instead of openwrt because it “won’t run as intended”.

EDIT: libvirtd is getting phased out as per https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/9.3_release_notes/deprecated-functionality so I guess you are right in this sense of not using it in production.

I recently just spent a day or so wrangling an old Odroid N2 that has a broken hdmi port (seems quite common). I have 2 Openwrt VMs running on it doing the routing and vpns, seems to work quite well. I think i’ll move over to a rk3588 device in the end though, but overall I think this way of using openwrt is quite useful once you get it set up and using these arm devices for it makes more sense than more power hungry options. This thing is an efficiency beast.