Happy new year everyone!
I'm having trouble resolving some domain names from a Debian machine using the internal MikroTik DNS resolver, see example with domain name php.net below. Other domain names are resolved successfully.
(192.168.1.1 is the IP of the MikroTik with v7.13)
If using the Google DNS on the Debian machine, everything is working as expected:
I thought the problem might be related to the pppoe uplink and some MTU stuff. Reducing MTU to 1480 / MRU to 1400 has no positive effect.
Extract from the config (let me know if you'd like to see more):
MikroTik log during the failed DNS request:
Any ideas would be helpful! Thank you very much!
I'm having trouble resolving some domain names from a Debian machine using the internal MikroTik DNS resolver, see example with domain name php.net below. Other domain names are resolved successfully.
(192.168.1.1 is the IP of the MikroTik with v7.13)
Code:
root@linux-server:/# dig any php.net; <<>> DiG 9.18.19-1~deb12u1-Debian <<>> any php.net;; global options: +cmd;; Got answer:;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 8617;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0;; QUESTION SECTION:;php.net. IN ANY;; Query time: 10004 msec;; SERVER: 192.168.1.1#53(192.168.1.1) (TCP);; WHEN: Mon Jan 01 22:30:33 CET 2024;; MSG SIZE rcvd: 25If using the Google DNS on the Debian machine, everything is working as expected:
Code:
root@linux-server:/# dig any php.net @8.8.8.8; <<>> DiG 9.18.19-1~deb12u1-Debian <<>> any php.net @8.8.8.8;; global options: +cmd;; Got answer:;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1269;; flags: qr rd ra; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 1;; OPT PSEUDOSECTION:; EDNS: version: 0, flags:; udp: 512;; QUESTION SECTION:;php.net. IN ANY;; ANSWER SECTION:php.net. 300 IN SOA ns1.php.net. admin.easydns.com. 1704142862 16384 2048 1048576 2560php.net. 30 IN MX 0 php-smtp4-ip4.php.net.php.net. 300 IN TXT "_globalsign-domain-verification=YKIbqgUIt0x2vDkmdYS8TzqfqP6jyVp2fVVyJWyopw"php.net. 300 IN TXT "v=spf1 ip4:140.211.15.143 ip4:45.112.84.5 ip4:142.93.197.176 ip6:2604:a880:400:d0::1c74:1001 ip6:2a02:cb43:8000::1102 ip4:157.90.121.187 ip6:2a01:4f8:1c1e:416d::1 ?all"php.net. 300 IN TXT "google-site-verification=R0anXzbL507wmRx5iv1S-5jN55RYVo2UYIqFP2L_k1g"php.net. 300 IN A 185.85.0.29php.net. 300 IN AAAA 2a02:cb40:200::1adphp.net. 300 IN NS dns2.easydns.net.php.net. 300 IN NS dns3.easydns.org.php.net. 300 IN NS dns1.easydns.com.php.net. 300 IN NS dns4.easydns.info.;; Query time: 16 msec;; SERVER: 8.8.8.8#53(8.8.8.8) (TCP);; WHEN: Mon Jan 01 22:30:38 CET 2024;; MSG SIZE rcvd: 622I thought the problem might be related to the pppoe uplink and some MTU stuff. Reducing MTU to 1480 / MRU to 1400 has no positive effect.
Extract from the config (let me know if you'd like to see more):
Code:
/ip dnsset allow-remote-requests=yes cache-max-ttl=1d cache-size=4096KiB servers=8.8.8.8/interface pppoe-clientadd add-default-route=yes disabled=no interface=combo1 max-mru=1492 max-mtu=1492 name=Telekom-DSL profile=telekom user=00000123456789@t-online.deMikroTik log during the failed DNS request:
Code:
23:12:40 dns query from 255.255.255.255: #420373 php.net. ALL 23:12:50 dns done query: #420373 dns server failureAny ideas would be helpful! Thank you very much!
Statistics: Posted by kehrlein — Mon Jan 01, 2024 11:45 pm