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932b4538ae
Currently if an error is encountered during a send() of a message, the
client fails and there is no possibility of recover, since no timers
are armed after a failed event dispatch. An easy way to reproduce a
failure is to add a firewall rule like:
iptables -A OUTPUT -p udp --dport 67 -j REJECT
which makes the send() fail with EPERM during the renew. In such case,
the client should continue (failing) until it reaches the rebind phase
at T2, when it will be able to renew the lease using the packet
socket.
In general, a failure to send a packet should not cause the failure of
the client.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/merge_requests/419
https://bugzilla.redhat.com/show_bug.cgi?id=1806516
(cherry picked from commit
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