If the V6 route is missing, UDP packets sent to v6 hosts would fail
immediately. dnsmasq tries to use usually some resolver, which is
responding. If v6 timeouts, they should not become such. It tries to
send query every 20 seconds or 50 queries to all servers. But in
general, it should work fine on UDP. TCP is more difficult, there are
unfixed issues.
On 2/16/23 08:42, Gomathi Shankar P S wrote:
Hi Team,
We are facing an issue when we have the following pre-conditions
* dnsmasq version - 2.83, and is running in strict-order
* both v6 and v4 nameservers are in the resolv file
* when v6 route is fails
there is no fail-over fallback to v4 from v6 nameserver for resolution.
I understand that dnsmasq only reaches V6 nameservers (note - we have
both v6 and v4 nameservers in resolv.dnsmasq) when we have V6 IP.
I haven't seen any code preferring just IPv6 nameservers when there is
also IPv4. It should treat them equally and choose last_server to be
used by any response arrived. If that is only IPv4 servers, it should
choose them.
If that does not happen, can you provide log with --log-queries or pcap
with recorded responses? I think it should work.
When V6 route fails (but still we have V6 IP), we would like dnsmasq
to reach V4 nameservers when V6 route is failed. Currently, it
forwards the domains only to V6 nameservers as we have V6 IPs.
In the case of "no-strict-order", dnsmasq is reaching out to all
nameservers.
Is it possible to let dnsmasq to reach out V4 nameservers if the route
fails (no response from V6 nameservers)?
Regards
Gomathi Shankar P S
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Petr Menšík
Software Engineer, RHEL
Red Hat,https://www.redhat.com/
PGP: DFCF908DB7C87E8E529925BC4931CA5B6C9FC5CB
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