[Dnsmasq-discuss] v2.83 failed to send packet: Network is unreachable

[Hannu Nyman]

I bisected the dnsmasq commits, and looks like it is caused by this:

15b60ddf935a531269bb8c68198de012a4967156  FAIL
824461192ca5098043f9ca4ddeba7df1f65b30ba  Ok ?

http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=15b60ddf935a531269bb8c68198de012a4967156

"Handle multiple identical near simultaneous DNS queries better."'

Dnsmasq built from earlier commits seem to avoid the error/warning messages, 
while builds after 15b60ddf cause log spam.


This bug is seen by lots of OpenWrt users, based on OpenWrt forum 
discussion.  E.g. onward from
https://forum.openwrt.org/t/security-advisory-2021-01-19-1-dnsmasq-multiple-vulnerabilities/85903/22

One observation in the forum discussion is that this is only/mainly seen when 
then are Windows PCs or Macs active in LAN. IPv6 RA/DHCPv6 may also play a role.