[Dnsmasq-discuss] v2.82, Linux: but after restart no reverse lookup, behind-veth VMs not served

[Steffen Nurpmeso]

Hi once again.

Steffen Nurpmeso wrote in
 <20201203205252.kqGnT%steffen at sdaoden.eu>:
 ...
 |I use a default 2.82 with default "example" configuration (the
 |CRUX-Linux i use since last year just patches some paths in it),
 |extended by appending
 |
 |  addn-hosts=/x/vm/hosts.txt
 |  #interface=lo
 |  listen-address=127.0.0.1
 |  interface=v_n
 |
 |This is a "${ip} link add v_n type veth peer name v_i", and it
 |does exist already when dnsmasq is started.
 |
 |  #listen-address=10.0.0.1
 |  #log-dhcp
 |  #dhcp-range=10.1.1.1,10.254.254.254,255.0.0.0,24h
 |  #no-dhcp-interface=lo
 |  #no-dhcp-interface=br0
 |  bogus-priv
 |  no-poll
 |  selfmx
 |  resolv-file=/etc/resolv.conf
 |  cache-size=2142
 |  #log-queries=extra
 |  #conf-dir=/etc/dnsmasq.d/,*.conf
 |
 |With this, at least if i suspend and resume the laptop, i can no
 |longer perform reverse lookups, as dnsmasq will refuse to do it,
 |with NXDOMAIN.  If i do "dig @OTHER-DNS-FROM-resolv.conf -x" i get
 |through.
 |
 |Ditto, if i start VMs in the netns linked in via interface=v_n
 |(created in the network namespace and their .ifup.sh is
 |   ip link set dev $1 master v_br
 |   ip link set $1 up
 |where v_br is just a bridge operating on the other end of v_n,
 |inside in the netns), these VMs cannot reach the outer world, name
 |lookup will fail.  They can reach the host and the host can reach
 |them.

With Linux 5.10.1 it also seems to happen on a freshly booted system.
Is this something i should report too the Linux bugtracker, maybe?

Other than that i will unsubscribe again soon -- keep on going!!

 |Both of these issues vanish if i restart dnsmasq, but whereas this
 |can be worked around easily upon resume i wonder why it happens,
 |and finally thought it would be best to subscribe for a bit, and
 |report it.

Ciao,

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)