Looking to flash OpenWRT
But I need following features:
- Captive portal with simple CAPTCHA or additional password
- Adblocking on DNS level
Device 512/256MB (RAM, Flash)
Is it possible to do on OpenWRT? If so, can you share some details?
Yes those things are possible, although captive portals are often a bit difficult to configure (steep learning curve).
Adblocking may need more memory.
What is the device? (brand + model)
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You can change DNS server to adblocking one even on minimal install.
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Not sure where you got these numbers from, but the GL-MT3000 has 512MB RAM and 256MB NAND Flash (see https://www.gl-inet.com/products/gl-mt3000/#specs)
- Ad blocking options are listed in https://openwrt.org/docs/guide-user/services/ad-blocking (I personally use adblock-lean because of its low footprint and simplicity)
- For Captive Portal you can check https://openwrt.org/docs/guide-user/services/captive-portal/opennds if it fulfills your needs
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Sorry, copied wrong string 
Can I set https://dns.adguard-dns.com/dns-query or tls://dns.adguard-dns.com as dns resolver?
You need some DoH proxy like stubby, for https:: or set those adguard classical dns servers as forwarders in dhcp-dns conf section.
But if your router has space and powers you can have more detailed control.
See also here https://forum.openwrt.org/t/how-to-use-dns-adguard-com/
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Keep in mind your router's storage can always be extended by a flash drive, if there's an USB port.
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What to do after that?
This is unencrypted information. Unfortunately no go for me…
We can presume this device is intended to be a travel router based on the requisite it can handle a captive portal?
I did… in the first response.
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Darn it.
I caught that and changed the reply.
Yes. On official firmware >3.* there was this option…
would be nice to close the issue.
DoH solved, how to setup Captive Portal?
@ed8 it is commands? Or part of script?
# Configure DoH provider
while uci -q delete https-dns-proxy.@https-dns-proxy[0]; do :; done
uci set https-dns-proxy.dns="https-dns-proxy"
uci set https-dns-proxy.dns.bootstrap_dns="8.8.8.8,8.8.4.4"
uci set https-dns-proxy.dns.resolver_url="https://dns.google/dns-query"
uci set https-dns-proxy.dns.listen_addr="127.0.0.1"
uci set https-dns-proxy.dns.listen_port="5053"
uci commit https-dns-proxy
service https-dns-proxy restart
I have no idea what that reply means.
I, certainly, was not asking if OpenWrt can handle captive portals; looks like something was lost in translation.
I'll rephrase.
Do you intend to use the device as a travel router?
No. It is my home router
uci is a command line utility indeed.
ps: all needed options for https-dns-proxy are provided through Web UI as well