restart DHCPv6 transaction on receival of RA who contains a new prefix #75
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When upstream DHCPv6 server does not provide IA_NA or IA_PD options,
odhcp6c enters in stateless mode, which will not be exited from until
SIGUSR2 signal is received.
This change enforce DHCPv6 transaction restart on receival of a RA that:
a) advertise the presence of DHCPv6 server in the network, either
by containing M or O flags
b) has a PI (prefix information) option that contains a new prefix
thus allowing the switch to DHCPv6 stateful mode when RA PI options
suggest that upstream DHCPv6 server now manages a new prefix.
Transaction restart is useful even when DHCPv6 client is already in
stateful mode, so DHCPv6 server will be able to refresh client's IA_NA
and IA_PD options before renewal timeout is triggered, hence avoiding
usage of potentially deprecated addresses.
Signed-off-by: Alin Nastac <[email protected]>
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When upstream DHCPv6 server does not provide IA_NA or IA_PD options, odhcp6c enters in stateless mode, which will not be exited from until SIGUSR2 signal is received.
This change enforce DHCPv6 transaction restart on receival of a RA that:
a) advertise the presence of DHCPv6 server in the network, either
by containing M or O flags
b) has a PI (prefix information) option that contains a new prefix
thus allowing the switch to DHCPv6 stateful mode when RA PI options suggest that upstream DHCPv6 server now manages a new prefix.
Transaction restart is useful even when DHCPv6 client is already in stateful mode, so DHCPv6 server will be able to refresh client's IA_NA and IA_PD options before renewal timeout is triggered, hence avoiding usage of potentially deprecated addresses.