[Bug 1821491] Re: DNS lookup fails for local hosts
Dan Streetman
dan.streetman at canonical.com
Mon Apr 15 21:52:11 UTC 2019
> $ dig phspi05 @192.168.2.1
> ;; Warning: Message parser reports malformed message packet.
that's generally not good...
> phspi05. 69314 IN A 192.168.2.35
ok, this is resolving the "single label" name. systemd-resolved never
forwards lookups of single-label names (except for LLMNR, I believe).
So, based on earlier output in this bug showing your configured search
domain, let's see what the output looks like when we include the search
domain:
$ dig phspi05.phs
$ dig phspi05.phs @192.168.2.1
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https://bugs.launchpad.net/bugs/1821491
Title:
DNS lookup fails for local hosts
Status in systemd package in Ubuntu:
Incomplete
Bug description:
Mint 19 (Ubuntu Bionic)
Laptop so Using NetworkManager, and connecting wirelessly to LAN
Upgraded from Mint 18.3 so using resolvconf...
Versions:
network-manager: 1.10.6-2ubuntu1.1
resolvconf: 1.79ubuntu10.18.04.3 or 1.79ubuntu10.18.04.2
systemd: 237-3ubuntu10.15
dns is specified in NetworkMananager as 192.168.2.1
the dns is a router, and has static ips assigned to certain hosts on my lan...
$cat resolv.conf
nameserver 127.0.0.53
search phs
options edns0
$ nslookup phspi05
Server: 127.0.0.53
Address: 127.0.0.53#53
** server can't find phspi05: SERVFAIL
If I explicity specify the dns:
$ nslookup phspi05 192.168.2.1
Server: 192.168.2.1
Address: 192.168.2.1#53
Non-authoritative answer:
Name: phspi05
Address: 192.168.2.35
I get the correct ip address...
Same with dig...
I would expect that the nameserver set in network-manager would be
used....
From tail of $ systemd-resolve --status
Link 2 (wlp2s0)
Current Scopes: DNS
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
DNS Servers: 192.168.2.1
DNS Domain: phs
So the dns address had been picked up from NetworkManager, but
apparently is not being used...
Thought it might be related to this bug:
https://bugs.launchpad.net/ubuntu/bionic/+source/resolvconf/+bug/1817903
So installed the proposed fix, but no change. I also tried removing
package resolvconf, again no change...
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