[FS#3935] DHCPv6 not working after OpenWrt update

OpenWrt Bugs openwrt-bugs at lists.openwrt.org
Fri Jul 16 06:14:18 PDT 2021 

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A new Flyspray task has been opened.  Details are below. 

User who did this - Anna Tikhomirova (vampik) 

Attached to Project - OpenWrt/LEDE Project
Summary - DHCPv6 not working after OpenWrt update
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I have updated OpenWrt on my router (x86-64 device) from very old openwrt-snapshot-r5986-3f7908d697 (built on 2018-02-01) to the new openwrt-snapshot-r16962-a603e82dd3 (built on 2021-06-17).

Before update: DHCPv6-enabled devices (Windows PCs and a network printer) got 2 IPv6 addresses each: one from SLAAC and another one from DHCPv6.

After update: DHCPv6-enabled devices (Windows PCs and a network printer) get only 1 IPv6 address from SLAAC. No DHCPv6 leases.

my dhcp configuration:
dhcp.lan=dhcp
dhcp.lan.interface='lan'
dhcp.lan.start='100'
dhcp.lan.dhcpv6='server'
dhcp.lan.ra='server'
dhcp.lan.limit='100'
dhcp.lan.leasetime='2h'
dhcp.lan.ra_management='1'

According to network dump, router advertisement does have managed flag, devices send dhcp6 solicit messages and receive dhcp6 advertise responses, but for some reason they don't use the advertised address.

Before update everything was working fine. Unfortunately I cannot downgrade firmware to check the dump on old firmware version.

15:21:47.108951 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 8) :: > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
15:21:47.109365 IP6 (flowlabel 0x9fb20, hlim 255, next-header ICMPv6 (58) payload length: 96) fe80::5054:ff:fec2:281e > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 96
        hop limit 64, Flags [managed, other stateful], pref medium, router lifetime 1800s, reachable time 0ms, retrans timer 0ms
          source link-address option (1), length 8 (1): 52:54:00:c2:28:1e
          mtu option (5), length 8 (1):  1280
          prefix info option (3), length 32 (4): 2001:[redacted]::/64, Flags [onlink, auto], valid time infinity, pref. time infinity
          rdnss option (25), length 24 (3):  lifetime 1800s, addr: 2001:[redacted]::1
          advertisement interval option (7), length 8 (1):  600000ms
15:21:47.674421 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 8) :: > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
15:21:47.674754 IP6 (flowlabel 0x9fb20, hlim 255, next-header ICMPv6 (58) payload length: 96) fe80::5054:ff:fec2:281e > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 96
        hop limit 64, Flags [managed, other stateful], pref medium, router lifetime 1800s, reachable time 0ms, retrans timer 0ms
          source link-address option (1), length 8 (1): 52:54:00:c2:28:1e
          mtu option (5), length 8 (1):  1280
          prefix info option (3), length 32 (4): 2001:[redacted]::/64, Flags [onlink, auto], valid time infinity, pref. time infinity
          rdnss option (25), length 24 (3):  lifetime 1800s, addr: 2001:[redacted]::1
          advertisement interval option (7), length 8 (1):  600000ms
15:21:48.075517 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=d5ddb0 (elapsed-time 0) (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))
15:21:48.075709 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 -> 0xdf33!] dhcp6 advertise (xid=d5ddb0 (server-ID hwaddr type 1 525400c2281e) (client-ID hwaddr type 1 ec8eb52308f4) (opt_82) (DNS-server 2001:[redacted]::1) (IA_NA IAID:2 T1:21600 T2:34560 (IA_ADDR 2001:[redacted]::3e7 pltime:43200 vltime:7200)))
15:21:49.178114 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=d5ddb0 (elapsed-time 101) (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))
15:21:49.178321 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 -> 0xdf33!] dhcp6 advertise (xid=d5ddb0 (server-ID hwaddr type 1 525400c2281e) (client-ID hwaddr type 1 ec8eb52308f4) (opt_82) (DNS-server 2001:[redacted]::1) (IA_NA IAID:2 T1:21600 T2:34560 (IA_ADDR 2001:[redacted]::3e7 pltime:43200 vltime:7200)))
15:21:51.283123 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=d5ddb0 (elapsed-time 307) (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))
15:21:51.283292 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 -> 0xdf33!] dhcp6 advertise (xid=d5ddb0 (server-ID hwaddr type 1 525400c2281e) (client-ID hwaddr type 1 ec8eb52308f4) (opt_82) (DNS-server 2001:[redacted]::1) (IA_NA IAID:2 T1:21600 T2:34560 (IA_ADDR 2001:[redacted]::3e7 pltime:43200 vltime:7200)))
15:21:55.593427 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=d5ddb0 (elapsed-time 735) (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))
15:21:55.593717 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 -> 0xdf33!] dhcp6 advertise (xid=d5ddb0 (server-ID hwaddr type 1 525400c2281e) (client-ID hwaddr type 1 ec8eb52308f4) (opt_82) (DNS-server 2001:[redacted]::1) (IA_NA IAID:2 T1:21600 T2:34560 (IA_ADDR 2001:[redacted]::3e7 pltime:43200 vltime:7200)))
15:22:04.214223 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=d5ddb0 (elapsed-time 1588) (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))
15:22:04.214412 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 -> 0xdf33!] dhcp6 advertise (xid=d5ddb0 (server-ID hwaddr type 1 525400c2281e) (client-ID hwaddr type 1 ec8eb52308f4) (opt_82) (DNS-server 2001:[redacted]::1) (IA_NA IAID:2 T1:21600 T2:34560 (IA_ADDR 2001:[redacted]::3e7 pltime:43200 vltime:7200)))
15:22:21.155065 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=d5ddb0 (elapsed-time 3278) (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))
15:22:21.155231 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 -> 0xdf33!] dhcp6 advertise (xid=d5ddb0 (server-ID hwaddr type 1 525400c2281e) (client-ID hwaddr type 1 ec8eb52308f4) (opt_82) (DNS-server 2001:[redacted]::1) (IA_NA IAID:2 T1:21600 T2:34560 (IA_ADDR 2001:[redacted]::3e7 pltime:43200 vltime:7200)))

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3935

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