[FS#3935] DHCPv6 not working after OpenWrt update

[OpenWrt Bugs]

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The following task has a new comment added:

FS#3935 - DHCPv6 not working after OpenWrt update
User who did this - Anna Tikhomirova (vampik)

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You're right. This is definitely caused by this commit.

After setting dhcp.lan.preferred_lifetime everything works fine.

dhcp.lan.leasetime='2h'
dhcp.lan.preferred_lifetime='2h'


17:30:10.742693 IP6 (hlim 1, next-header UDP (17) payload length: 107) fe80::ee8e:b5ff:fe23:8f4.546 > ff02::1:2.547: [udp sum ok] dhcp6 solicit (xid=5753f4 (elapsed-time 103) (client-ID hwaddr type 1 ec8eb52308f4) (IA_NA IAID:2 T1:14400 T2:21600 (IA_ADDR :: pltime:28800 vltime:36000)) (option-request status-code server-unicast DNS-server DNS-search-list Client-FQDN preference) (Client-FQDN))
17:30:10.742962 IP6 (flowlabel 0x77edf, hlim 64, next-header UDP (17) payload length: 112) fe80::5054:ff:fec2:281e.547 > fe80::ee8e:b5ff:fe23:8f4.546: [bad udp cksum 0x215e -> 0xacdf!] dhcp6 advertise (xid=5753f4 (server-ID hwaddr type 1 525400c2281e) (client-ID hwaddr type 1 ec8eb52308f4) (opt_82) (DNS-server 2001:[redacted]::1) (IA_NA IAID:2 T1:3600 T2:5760 (IA_ADDR 2001:[redacted]::3e7 pltime:7200 vltime:7200)))
17:30:10.743531 IP6 (hlim 1, next-header UDP (17) payload length: 119) fe80::ee8e:b5ff:fe23:8f4.546 > ff02::1:2.547: [udp sum ok] dhcp6 request (xid=fc1ba7 (elapsed-time 0) (client-ID hwaddr type 1 ec8eb52308f4) (server-ID hwaddr type 1 525400c2281e) (IA_NA IAID:2 T1:3600 T2:5760 (IA_ADDR 2001:[redacted]::3e7 pltime:7200 vltime:7200)) (option-request status-code server-unicast DNS-server DNS-search-list Client-FQDN) (Client-FQDN))
17:30:10.743833 IP6 (flowlabel 0x77edf, hlim 64, next-header UDP (17) payload length: 112) fe80::5054:ff:fec2:281e.547 > fe80::ee8e:b5ff:fe23:8f4.546: [bad udp cksum 0x215e -> 0xdf87!] dhcp6 reply (xid=fc1ba7 (server-ID hwaddr type 1 525400c2281e) (client-ID hwaddr type 1 ec8eb52308f4) (opt_82) (DNS-server 2001:[redacted]::1) (IA_NA IAID:2 T1:3600 T2:5760 (IA_ADDR 2001:[redacted]::3e7 pltime:7200 vltime:7200)))
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3935#comment9931

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