We have a dns proxy running on 127.0.0.5:53. Below are the logs for ubuntu 22.04 LTS and is not working 1...... dig google.com ;; communications error to 127.0.0.53#53: timed out ;; communications error to 127.0.0.53#53: timed out ;; communications error to 127.0.0.53#53: timed out ; <<>> DiG 9.18.12-0ubuntu0.22.04.2-Ubuntu <<>> google.com ;; global options: +cmd ;; no servers could be reached 2...... resolvectl Global Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported resolv.conf mode: stub Link 2 (ens33) Current Scopes: DNS Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported Current DNS Server: 75.75.75.75 DNS Servers: 75.75.75.75 75.75.76.76 DNS Domain: hsd1.ca.comcast.net Link 3 (wg0) Current Scopes: DNS Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported Current DNS Server: 127.0.0.5 DNS Servers: 127.0.0.5 DNS Domain: ~google.com ~icanhazip.com ~myvm.banyan.local Link 4 (docker0) Current Scopes: none Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported 3.....TCPDUMP on loopback interface shows some packets for first request and after that there are no packets seen at all. Command used tcpdump -v -i lo host 127.0.0.5 -n -e 13:49:10.755476 00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv4 (0x0800), length 87: (tos 0x0, ttl 64, id 37216, offset 0, flags [none], proto UDP (17), length 73)     10.115.0.12.41708 > 127.0.0.5.53: [bad udp cksum 0x89ca -> 0x5f03!] 27623+ [1au] A? mtalk.google.com. ar: . OPT UDPsize=65508 (45) 13:49:10.823942 00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv4 (0x0800), length 103: (tos 0x0, ttl 64, id 20158, offset 0, flags [DF], proto UDP (17), length 89)     127.0.0.5.53 > 10.115.0.12.41708: [bad udp cksum 0x89da -> 0xea69!] 27623 q: A? mtalk.google.com. 1/0/1 mtalk.google.com. [5m] A 142.250.136.188 ar: . OPT UDPsize=512 (61) 13:49:14.005421 00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv4 (0x0800), length 87: (tos 0x0, ttl 64, id 31594, offset 0, flags [none], proto UDP (17), length 73)     10.115.0.12.54467 > 127.0.0.5.53: [bad udp cksum 0x89ca -> 0xe4a5!] 44148+ [1au] A? drive.google.com. ar: . OPT UDPsize=65508 (45) 13:49:14.005498 00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv4 (0x0800), length 87: (tos 0x0, ttl 64, id 9557, offset 0, flags [none], proto UDP (17), length 73)     10.115.0.12.35442 > 127.0.0.5.53: [bad udp cksum 0x89ca -> 0x39bb!] 41328+ [1au] Type65? drive.google.com. ar: . OPT UDPsize=65508 (45) 13:49:14.070235 00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv4 (0x0800), length 137: (tos 0x0, ttl 64, id 20216, offset 0, flags [DF], proto UDP (17), length 123)     127.0.0.5.53 > 10.115.0.12.35442: [bad udp cksum 0x89fc -> 0xb9dc!] 41328 q: Type65? drive.google.com. 0/1/1 ns: google.com. [1m] SOA ns1.google.com. dns-admin.google.com. 561875416 900 900 1800 60 ar: . OPT UDPsize=512 (95) 13:49:14.071633 00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv4 (0x0800), length 183: (tos 0x0, ttl 64, id 20217, offset 0, flags [DF], proto UDP (17), length 169)     127.0.0.5.53 > 10.115.0.12.54467: [bad udp cksum 0x8a2a -> 0x5a27!] 44148 q: A? drive.google.com. 6/0/1 drive.google.com. [5m] A 209.85.234.138, drive.google.com. [5m] A 209.85.234.101, drive.google.com. [5m] A 209.85.234.139, drive.google.com. [5m] A 209.85.234.113, drive.google.com. [5m] A 209.85.234.102, drive.google.com. [5m] A 209.85.234.100 ar: . OPT UDPsize=512 (141) 4……..Logs on systems-resolved Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: wg0: Bus client set DNS server list to: 127.0.0.5 Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Sent message type=method_return sender=n/a destination=:1.523 path=n/a interface=n/a member=n/a cookie=146 reply_cookie=2 signature=n/a error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Got message type=method_call sender=:1.524 destination=org.freedesktop.resolve1 path=/org/freedesktop/resolve1 interface=org.freedesktop.resolve1.Manager member=SetLinkDomains cookie=2 reply_cookie=0 signature=ia(sb) error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=GetConnectionUnixUser cookie=147 reply_cookie=0 signature=s error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Got message type=method_return sender=org.freedesktop.DBus destination=:1.482 path=n/a interface=n/a member=n/a cookie=75 reply_cookie=147 signature=u error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=GetConnectionUnixProcessID cookie=148 reply_cookie=0 signature=s error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Got message type=method_return sender=org.freedesktop.DBus destination=:1.482 path=n/a interface=n/a member=n/a cookie=76 reply_cookie=148 signature=u error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: D-Bus dns domains change request from client PID 78225 (n/a) with UID 4294967295 Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Scope of DNS server 127.0.0.5 has only route-only domains, not using as global name server Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: wg0: Bus client set search domain list to: ~myvm.banyan.local, ~google.com, ~icanhazip.com Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Sent message type=method_return sender=n/a destination=:1.524 path=n/a interface=n/a member=n/a cookie=149 reply_cookie=2 signature=n/a error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Got message type=method_call sender=:1.525 destination=org.freedesktop.resolve1 path=/org/freedesktop/resolve1 interface=org.freedesktop.resolve1.Manager member=FlushCaches cookie=2 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=GetConnectionUnixProcessID cookie=150 reply_cookie=0 signature=s error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Got message type=method_return sender=org.freedesktop.DBus destination=:1.482 path=n/a interface=n/a member=n/a cookie=77 reply_cookie=150 signature=u error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: D-Bus cache flush request from client PID 78226 (n/a) with UID 4294967295 Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Flushed all caches. Sep 6 13:49:04 devanath-virtual-machine systemd-resolved[74204]: Sent message type=method_return sender=n/a destination=:1.525 path=n/a interface=n/a member=n/a cookie=151 reply_cookie=2 signature=n/a error-name=n/a error-message=n/a Sep 6 13:49:04 devanath-virtual-machine