Add dns-over-https.md

dns-over-https.md

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+# DoH Server
+
+# Note!
+
+This setup verified partially only. It is slightly better than blocking, but likely DOH clients will refuse to work due certificate mismatch.
+
+# Installing/updating unbound
+
+1. Update typical docker image `docker pull alpinelinux/unbound`
+2. You might beed to do in some cases `docker-compose build --no-cache` in directory of unbound docker-compose.yml
+3. Generate certificates, same directory where unbound.conf is located
+
+```bash
+openssl genrsa -out key.pem 4096
+openssl req -new -x509 -key key.pem -out cert.pem -days 3650 \
+  -subj "/C=US/ST=State/L=City/O=Organization/CN=spinesystems.solutions"
+```
+4. Add the following to unbound.conf to `server:` section
+
+```
+server:
+    ...
+    interface: 0.0.0.0@443
+    tls-service-key: "/etc/unbound/key.pem"
+    tls-service-pem: "/etc/unbound/cert.pem"
+```
+
+5. Run the container `docker-compose up -d`
+
+Your unbound ready now to accept DoH requests on port 443
+
+## IPTables on nat/pppoe
+
+
+```
+ipset create dohservers hash:net family inet
+
+# Cloudflare DNS (1.1.1.1, 1.0.0.1)
+ipset add dohservers 1.1.1.1/32
+ipset add dohservers 1.0.0.1/32
+#ipset add dohservers 2606:4700:4700::1111/128
+#ipset add dohservers 2606:4700:4700::1001/128
+
+# Google DNS (8.8.8.8, 8.8.4.4)
+ipset add dohservers 8.8.8.8/32
+ipset add dohservers 8.8.4.4/32
+#ipset add dohservers 2001:4860:4860::8888/128
+#ipset add dohservers 2001:4860:4860::8844/128
+
+# Quad9 DNS (9.9.9.9, 149.112.112.112)
+ipset add dohservers 9.9.9.9/32
+ipset add dohservers 149.112.112.112/32
+#ipset add dohservers 2620:fe::fe/128
+#ipset add dohservers 2620:fe::9/128
+
+# NextDNS (45.90.28.0 - 45.90.31.255)
+ipset add dohservers 45.90.28.0/22
+#ipset add dohservers 2a07:a8c0::/29
+
+# AdGuard DNS (94.140.14.14, 94.140.15.15)
+ipset add dohservers 94.140.14.14/32
+ipset add dohservers 94.140.15.15/32
+#ipset add dohservers 2a10:50c0::ad1:ff/128
+#ipset add dohservers 2a10:50c0::ad2:ff/128
+
+# OpenDNS (Cisco Umbrella) (208.67.222.222, 208.67.220.220)
+ipset add dohservers 208.67.222.222/32
+ipset add dohservers 208.67.220.220/32
+#ipset add dohservers 2620:119:35::35/128
+#ipset add dohservers 2620:119:53::53/128
+
+# DNS.SB (185.222.222.222, 185.184.222.222)
+ipset add dohservers 185.222.222.222/32
+ipset add dohservers 185.184.222.222/32
+#ipset add dohservers 2a09::/32
+
+# cloudflare-dns.com
+dig +short cloudflare-dns.com A | xargs -n1 ipset add dohservers
+# dns.google
+dig +short dns.google A | xargs -n1 ipset add dohservers
+# dns9.quad9.net
+dig +short dns9.quad9.net A | xargs -n1 ipset add dohservers
+
+
+# Here goes other ipset stuff and maybe iptables rules...
+
+iptables -t nat -A PREROUTING -p tcp --dport 53 -m set --match-set dohservers dst -j DNAT --to-destination 10.0.100.6:443
+```