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#1 2024-07-03 00:07:22

fopdudel
Member
Registered: 2021-02-12
Posts: 17

[SOLVED] dnsmasq 2.90-1 no longer working after system update

I recently did a full system update after 3 months of not using this machine. Unfortunately the update broke dnsmasq and I can no longer resolve domain names using it; in order to connect to the internet, I have to revert to default dns settings.

I have it configured according to https://wiki.archlinux.org/title/Networ … forwarding, so

/etc/NetworkManager/conf.d/dns.conf:

[main]
dns=dnsmasq

I also have /etc/NetworkManager/dnsmasq.d/dnsmasq.conf with the following settings:

cache-size=1000
conf-file=/etc/NetworkManager/dnsmasq-shared.d/bad_domains.txt

The domain list was gotten from https://raw.githubusercontent.com/notra … omains.txt

Then run `sudo nmcli general reload` with those configs

This setup was working fine for me before I updated all my packages. Now I can only connect to the internet with default dns, not dnsmasq.

systemctl status dnsmasq.service:

● dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
     Loaded: loaded (/usr/lib/systemd/system/dnsmasq.service; enabled; preset: disabled)
     Active: active (running) since Wed 2024-07-03 00:40:21 BST; 8min ago
 Invocation: 7664c35633b44449ae1a96a47c53c407
       Docs: man:dnsmasq(8)
    Process: 138460 ExecStartPre=/usr/bin/dnsmasq --test (code=exited, status=0/SUCCESS)
   Main PID: 138469 (dnsmasq)
      Tasks: 1 (limit: 8190)
     Memory: 880K (peak: 1.8M)
        CPU: 69ms
     CGroup: /system.slice/dnsmasq.service
             └─138469 /usr/bin/dnsmasq -k --enable-dbus --user=dnsmasq --pid-file

Jul 03 00:40:21 laptop dnsmasq[138469]: DBus support enabled: connected to system bus
Jul 03 00:40:21 laptop dnsmasq[138469]: reading /etc/resolv.conf
Jul 03 00:40:21 laptop dnsmasq[138469]: ignoring nameserver 127.0.0.1 - local interface
Jul 03 00:40:21 laptop dnsmasq[138469]: read /etc/hosts - 3 names
Jul 03 00:42:23 laptop dnsmasq[138469]: reading /etc/resolv.conf
Jul 03 00:42:23 laptop dnsmasq[138469]: using nameserver 100.64.0.7#53
Jul 03 00:42:23 laptop dnsmasq[138469]: using nameserver [router address]#53
Jul 03 00:42:23 laptop dnsmasq[138469]: using nameserver [router address]#53

Any pointers are appreciated, thank you!

Last edited by fopdudel (2024-07-14 14:43:51)

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#2 2024-07-03 06:24:39

-thc
Member
Registered: 2017-03-15
Posts: 585

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

Does it work when you remove the "conf-file" option?

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#3 2024-07-03 13:51:39

fopdudel
Member
Registered: 2021-02-12
Posts: 17

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

-thc wrote:

Does it work when you remove the "conf-file" option?

No, still same result with that option removed

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#4 2024-07-13 18:45:50

fopdudel
Member
Registered: 2021-02-12
Posts: 17

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

So it turns out I was missing the

listen-address=::1,127.0.0.1

line (https://wiki.archlinux.org/title/Dnsmasq#DNS_server)

I added that and it's now working*. Though I'm not sure why it was working before the update. Maybe the update overwrote that line?

*The first time I try to visit websites it says "Server not found", but websites load after a few refreshes. And then after that they load fine.

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#5 2024-07-13 19:21:40

-thc
Member
Registered: 2017-03-15
Posts: 585

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

As far as I understand the wiki article NetworkManager itself sets this parameter - no need to specify any basic dnsmasq configuration - although additional configuration may be specified via "/etc/NetworkManager/dnsmasq.d"

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#6 2024-07-13 19:23:48

fopdudel
Member
Registered: 2021-02-12
Posts: 17

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

-thc wrote:

As far as I understand the wiki article NetworkManager itself sets this parameter - no need to specify any basic dnsmasq configuration - although additional configuration may be specified via "/etc/NetworkManager/dnsmasq.d"

Huh. Yeah, it also stopped working again shortly after I replied. So really unsure as to what the problem is.

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#7 2024-07-13 19:59:02

-thc
Member
Registered: 2017-03-15
Posts: 585

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

Does the "/etc/resolv.conf" look o.k.?

Can you resolve names via

drill archlinux.org @127.0.0.1

?

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#8 2024-07-13 20:52:01

fopdudel
Member
Registered: 2021-02-12
Posts: 17

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

-thc wrote:

Does the "/etc/resolv.conf" look o.k.?

Can you resolve names via

drill archlinux.org @127.0.0.1

?

Nope

;; ->>HEADER<<- opcode: QUERY, rcode: REFUSED, id: 34167
;; flags: qr rd ra ; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 
;; QUESTION SECTION:
;; archlinux.org.	IN	A

;; ANSWER SECTION:

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

;; Query time: 0 msec
;; SERVER: 127.0.0.1
;; WHEN: Sat Jul 13 21:51:00 2024
;; MSG SIZE  rcvd: 31

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#9 2024-07-14 06:11:23

-thc
Member
Registered: 2017-03-15
Posts: 585

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

Well - the error code REFUSED is some kind of progress - at least: A fresh NM/dnsmasq installation doesn't show this behavior.

Please post the output of those commands ("ss" with root privileges):

ps auxfww | grep NetworkManager
ss -l -u -n -p

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#10 2024-07-14 11:21:00

fopdudel
Member
Registered: 2021-02-12
Posts: 17

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

$ ps auxfww | grep NetworkManager
root         576  0.6  0.3 954204 25320 ?        Ssl  11:43   0:13 /usr/bin/NetworkManager --no-daemon
myname     68835  0.0  0.0   6824  3800 pts/0    S+   12:18   0:00      \_ grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn --exclude-dir=.idea --exclude-dir=.tox NetworkManager
$ sudo ss -l -u -n -p                   
State    Recv-Q   Send-Q                   Local Address:Port      Peer Address:Port   Process                                     
UNCONN   0        0                              0.0.0.0:53             0.0.0.0:*       users:(("dnsmasq",pid=627,fd=4))           
UNCONN   0        0                              0.0.0.0:59646          0.0.0.0:*                                                  
UNCONN   0        0                                    *:53                   *:*       users:(("dnsmasq",pid=627,fd=6))           
UNCONN   0        0          [fe80::6caa:1dc8:3a93:ac13]:546                  *:*       users:(("NetworkManager",pid=576,fd=22))   
UNCONN   0        0                                    *:59646                *:*

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#11 2024-07-14 13:48:52

-thc
Member
Registered: 2017-03-15
Posts: 585

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

This looks like dnsmasq is running as it's own service - which will not work.

This is how a correct combo should look like:

root         320  0.1  1.2 412052 24072 ?        Ssl  15:40   0:00 /usr/bin/NetworkManager --no-daemon
nobody       340  0.0  0.2  14256  5504 ?        S    15:40   0:00  \_ /usr/bin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces --pid-file=/run/NetworkManager/dnsmasq.pid --listen-address=127.0.0.1 --cache-size=400 --clear-on-reload --conf-file=/dev/null --enable-dbus=org.freedesktop.NetworkManager.dnsmasq --conf-dir=/etc/NetworkManager/dnsmasq.d
State  Recv-Q Send-Q Local Address:Port Peer Address:PortProcess                          
UNCONN 0      0          127.0.0.1:53        0.0.0.0:*    users:(("dnsmasq",pid=340,fd=4))

As you can see, NetworkManager spawns it's own dnsmasq instance with PID 340 that is the one listening on the loopback port 53.

Please check if you have an active systemd unit for dnsmasq:

systemctl status dnsmasq

If that's the case disable it and remove/move dnsmasq's own configuration.

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#12 2024-07-14 14:43:31

fopdudel
Member
Registered: 2021-02-12
Posts: 17

Re: [SOLVED] dnsmasq 2.90-1 no longer working after system update

-thc wrote:

This looks like dnsmasq is running as it's own service - which will not work.

This is how a correct combo should look like:

root         320  0.1  1.2 412052 24072 ?        Ssl  15:40   0:00 /usr/bin/NetworkManager --no-daemon
nobody       340  0.0  0.2  14256  5504 ?        S    15:40   0:00  \_ /usr/bin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces --pid-file=/run/NetworkManager/dnsmasq.pid --listen-address=127.0.0.1 --cache-size=400 --clear-on-reload --conf-file=/dev/null --enable-dbus=org.freedesktop.NetworkManager.dnsmasq --conf-dir=/etc/NetworkManager/dnsmasq.d
State  Recv-Q Send-Q Local Address:Port Peer Address:PortProcess                          
UNCONN 0      0          127.0.0.1:53        0.0.0.0:*    users:(("dnsmasq",pid=340,fd=4))

As you can see, NetworkManager spawns it's own dnsmasq instance with PID 340 that is the one listening on the loopback port 53.

Please check if you have an active systemd unit for dnsmasq:

systemctl status dnsmasq

If that's the case disable it and remove/move dnsmasq's own configuration.

Thank you so much, this was it. I've disabled dnsmasq's service and the dns caching works perfectly now.

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