i currently trying to solve a problem within a heterogeneous network (linux servers with arch, windows clients).
Current Situation: I got a nat gateway which runs dnsmasq as dns and dhcp server. It got 3 interfaces (wan, home, guest) with different networks. Interfaces got static ips via systemd-networkd. The files are located at /etc/systemd/network/eth*.network:
[Match] Name=eth0 [Network] Address=192.168.0.4/24 Gateway=192.168.0.254 DNS=192.168.0.254
[Match] Name=eth1 [Network] Address=172.17.0.254/16
[Match] Name=eth2 [Network] Address=172.16.0.254/16
nsswitch.conf looks like that:
# Name Service Switch configuration file. # See nsswitch.conf(5) for details. passwd: files mymachines systemd group: files mymachines systemd shadow: files publickey: files hosts: files mymachines myhostname resolve [!UNAVAIL=return] dns networks: files protocols: files services: files ethers: files rpc: files netgroup: files
dnsmasq is setup this way:
domain-needed bogus-priv no-resolv dhcp-sequential-ip interface=lo interface=eth1 interface=eth2 bind-interfaces domain=local expand-hosts local=/local/ server=192.168.0.254 #server=184.108.40.206 #server=220.127.116.11 dhcp-range=eth1,172.17.2.1,172.17.2.200,255.255.0.0,168h dhcp-range=eth2,172.16.2.1,172.16.2.200,255.255.0.0,168h dhcp-option=eth1,3,172.17.0.254 dhcp-option=eth2,3,172.16.0.254 dhcp-option=eth1,6,172.17.0.254 dhcp-option=eth2,6,172.16.0.254
Behind the nat gateway there is another router (192.168.0.254) which provides DNS-Services. I got another Linux-Server on 172.16.0.1 (server01). I configured the /etc/hosts on the nat gateway like this:
Static table lookup for hostnames. # See hosts(5) for details. 127.0.0.1 localhost 172.16.0.254 server02 172.17.0.254 server02 192.168.0.4 server02 172.16.0.1 server01
There is nothing written in /etc/resolv.conf on nat gateway.
I can ping www.google.de or similiar from every device within my network and it resolves fine. if i use drill with any hostname (no matter if they are looking for local hosts or in the internet) on my linux machines i get this error:
Error: error sending query: No (valid) nameservers defined in the resolver
if i use nslookup on my linux machines they time out (no matter if its looked for local hosts or in the internet).
pinging www.google works. pinging for server02 (or server02.local, .lan or whatever) on server01 isnt.
I am using systemd-resolved as my dns-service on server01. Interface config for server01 is this:
[Match] Name=eth0 [Network] Address=172.16.0.1/16 Gateway=172.16.0.254 DNS=172.16.0.254
resolvectl status on server01:
Global LLMNR setting: yes MulticastDNS setting: yes DNSOverTLS setting: no DNSSEC setting: allow-downgrade DNSSEC supported: yes Fallback DNS Servers: 18.104.22.168 22.214.171.124 126.96.36.199 2606:4700:4700::1111 2620:fe::10 2001:4860:4860::8888 DNSSEC NTA: 10.in-addr.arpa 16.172.in-addr.arpa 168.192.in-addr.arpa 17.172.in-addr.arpa 18.172.in-addr.arpa 19.172.in-addr.arpa 20.172.in-addr.arpa 21.172.in-addr.arpa 22.172.in-addr.arpa 23.172.in-addr.arpa 24.172.in-addr.arpa 25.172.in-addr.arpa 26.172.in-addr.arpa 27.172.in-addr.arpa 28.172.in-addr.arpa 29.172.in-addr.arpa 30.172.in-addr.arpa 31.172.in-addr.arpa corp d.f.ip6.arpa home internal intranet lan local private test Link 2 (eth0) Current Scopes: DNS LLMNR/IPv4 DefaultRoute setting: yes LLMNR setting: yes MulticastDNS setting: no DNSOverTLS setting: no DNSSEC setting: allow-downgrade DNSSEC supported: yes Current DNS Server: 172.16.0.254 DNS Servers: 172.16.0.254
If i use nslookup on my windows machines i get a resolution for any hostname (server01, server01.local, etc) (no matter if they are local or in the internet). if i ping for server02 it cant resolve. if i ping for server02.local or server01.local it resolves.
I really cant explain this behavior. My best guess is that it has something todo with another dns server that is running somewhere hidden in my network. But this must be a client or whatever, since there are only two servers with very minimal setup. i have looked for avahi-daemons running anywhere but i dont find any or i am doing it the wrong way.
Can some1 give me a hint where to look at to solve my problems? My biggest problem is that i want to access my samba shares at server01 via hostname resolution, which doesnt work :(