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Have global ipv6 address but unable to access internet over ipv6

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dave14305 said:
You need to identify your actual WAN interface name and use that instead of eth0.
Click to expand...
Eth 5 is the wan interface as shwn in the log as I unplugged it.

Apr 9 18:33:00 kernel: eth5 (Int switch port: 5) (Logical Port: 5) (phyId: 11) Link DOWN.
Apr 9 18:33:06 WAN_Connection: WAN(0) link down.
Apr 9 18:33:11 kernel: MACSEC: macsec is not enabled
Apr 9 18:33:12 kernel: eth5 (Int switch port: 5) (Logical Port: 5) (phyId: 11) Link Up at 2500 mbps full duplex
Apr 9 18:33:17 WAN_Connection: WAN(0) link up.
Apr 9 18:33:17 rc_service: wanduck 1547:notify_rc restart_wan_if 0
Apr 9 18:33:17 wsdd2[3715]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Apr 9 18:33:17 wsdd2[3715]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Apr 9 18:33:17 wsdd2[3715]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Apr 9 18:33:17 ddns: vlan101 has not yet obtained an WAN IPv6 address.(10)
Apr 9 18:33:17 ddns: WAN(0) IP is empty.(10)
Apr 9 18:33:17 kernel: ^[[0;33;41m[ERROR pktrunner] runnerUcast_inet6addr_event,148: Could not rdpa_system_ipv6_host_address_table_find ret=-5^[[0m
Apr 9 18:33:17 wsdd2[3715]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Apr 9 18:33:17 dnsmasq[3696]: interface br0 failed to join DHCPv6 multicast group: Address already in use
Apr 9 18:33:17 wsdd2[3715]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Apr 9 18:33:17 wsdd2[3715]: error: wsdd-mcast-v6: wsd_send_soap_msg: send
Apr 9 18:33:17 wan: mac clone: [wan0_hwaddr] == [D8:EC:5E:AC:AC:12]
Apr 9 18:33:17 rc_service: udhcpc_wan 12931:notify_rc start_rdisc6
Apr 9 18:33:17 wsdd2[3715]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Apr 9 18:33:17 wsdd2[3715]: error: wsdd-mcast-v6: wsd_send_soap_msg: send
Apr 9 18:33:18 rc_service: udhcpc_wan 12931:notify_rc start_dhcp6c
Apr 9 18:33:18 odhcp6c[12968]: Failed to send RS (Cannot assign requested address)
Apr 9 18:33:20 wan: finish adding multi routes
Apr 9 18:33:20 miniupnpd[2958]: shutting down MiniUPnPd
Apr 9 18:33:22 WAN_Connection: WAN was restored.
Apr 9 18:33:25 miniupnpd[13154]: HTTP listening on port 36853
Apr 9 18:33:25 miniupnpd[13154]: Listening for NAT-PMP/PCP traffic on port 5351
Apr 9 18:33:25 ddns: vlan101 has not yet obtained an WAN IPv6 address.(10)
Apr 9 18:33:25 ddns: update WWW.DNSOMATIC.COM default@dnsomatic.com, wan_unit 0
Apr 9 18:33:25 ddns: Clear ddns cache.
Apr 9 18:33:25 ddns: Start Inadyn(10).
Apr 9 18:33:25 inadyn[13160]: In-a-dyn version 2.10.0 -- Dynamic DNS update client.
Apr 9 18:33:25 inadyn[13160]: Update forced for alias all.dnsomatic.com, new IP# 80.79.49.38
Apr 9 18:33:25 inadyn[13160]: Updating cache for all.dnsomatic.com
Apr 9 18:33:29 BWDPI: fun bitmap = 43f
Apr 9 18:33:30 dhcp6_client: WAN Prefix Size Requested:/56, Received:/56
Apr 9 18:33:30 dhcp6_client: bound address 2a12:f43:1300::38f0/128, prefix 2a12:f43:1210:9600::/56
Apr 9 18:33:30 ddns: update WWW.DNSOMATIC.COM default@dnsomatic.com, wan_unit 0
Apr 9 18:33:30 ddns: Clear ddns cache.
Apr 9 18:33:30 ddns: Start Inadyn(10).
Apr 9 18:33:30 inadyn[13221]: In-a-dyn version 2.10.0 -- Dynamic DNS update client.
Apr 9 18:33:30 inadyn[13221]: Update forced for alias all.dnsomatic.com, new IP# 80.79.49.38<2a12:f43:1300::38f0>
Apr 9 18:33:31 rc_service: udhcpc_wan 12931:notify_rc stop_samba
Apr 9 18:33:31 wsdd2[3715]: Terminated received.
Apr 9 18:33:31 Samba_Server: smb daemon is stopped
Apr 9 18:33:31 inadyn[13221]: Updating cache for all.dnsomatic.com
Apr 9 18:33:32 rc_service: udhcpc_wan 12931:notify_rc start_samba
Apr 9 18:33:32 Samba_Server: daemon is started
Apr 9 18:33:33 dhcp_client: bound 80.79.49.38/255.255.255.0 via 80.79.49.1 for 600 seconds.

andy@RT-AX86U_Pro-4368:/tmp/home/root# tcpdump -v -n '(icmp6 and ip6[40] == 134) or (udp and port 547)' -i eth5
tcpdump: listening on eth5, link-type EN10MB (Ethernet), snapshot length 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel


Still returns nothing :(
 
Assuming that ifconfig eth5 is showing the bound address 2a12:f43:1300::38f0 and ifconfig br0 is showing the router address 2a12:f43:1210:9600::1, the problem appears to be why is no ipv6 traffic being accepted by the ISP (assuming it is even reaching it). When running tcpdump, did you try to generate any ipv6 traffic (running ping from a pc or the router)?
 
archiel said:
Assuming that ifconfig eth5 is showing the bound address 2a12:f43:1300::38f0 and ifconfig br0 is showing the router address 2a12:f43:1210:9600::1, the problem appears to be why is no ipv6 traffic being accepted by the ISP (assuming it is even reaching it). When running tcpdump, did you try to generate any ipv6 traffic (running ping from a pc or the router)?
Click to expand...
Yes I ran a ping -6 command from my pc whilst tcpdump was running
 
Try these commands in 2 separate SSH windows:
First window:
Code: 
tcpdump -v -n '(icmp6 and ip6[40] == 134) or (udp and port 547)' -i vlan101
Second window:
Code: 
kill -USR2 $(pidof odhcp6c)
After the kill, you should definitely (hopefully!) see traffic in the first window.
 
dave14305 said:
Try these commands in 2 separate SSH windows:
First window:
Code: 
tcpdump -v -n '(icmp6 and ip6[40] == 134) or (udp and port 547)' -i vlan101
Second window:
Code: 
kill -USR2 $(pidof odhcp6c)
After the kill, you should definitely (hopefully!) see traffic in the first window.
Click to expand...
Hi, apologies for the delay

I get this

Code: 
ASUSWRT-Merlin RT-AX86U_PRO 3004.388.6_2 Tue Feb 27 02:43:32 UTC 2024

andy@RT-AX86U_Pro-4368:/tmp/home/root# tcpdump -v -n '(icmp6 and ip6[40] ==134)

or (udp and port 547)' -i vlan101

tcpdump: listening on vlan101, link-type EN10MB (Ethernet), snapshot length 2621                                                           44 bytes

17:42:50.882283 IP6 (flowlabel 0xd87f1, hlim 1, next-header UDP (17) payload len                                                           gth: 157) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e0 -                                                           > 0xcc33!] dhcp6 renew (xid=f9a047 (elapsed-time 0) (option-request opt_82) (cli                                                           ent-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (IA_NA IAID:                                                           1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39cd pltime:0 vltime:0)) (IA_PD IAID:830482                                                            T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:3100::/56 pltime:0 vltime:0)))

17:42:50.895046 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 1                                                           49) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] d                                                           hcp6 reply (xid=f9a047 (client-ID hwaddr type 1 c87f54454368) (server-ID vid 000                                                           0058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f4                                                           3:1300::39cd pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-pre                                                           fix 2a12:f43:1211:3100::/56 pltime:600 vltime:600)))

17:43:15.982098 IP6 (flowlabel 0xd87f1, hlim 1, next-header UDP (17) payload len                                                           gth: 103) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2aa -                                                           > 0xd0ac!] dhcp6 solicit (xid=57014d (elapsed-time 0) (option-request opt_82) (c                                                           lient-ID hwaddr type 1 c87f54454368) (reconfigure-accept) (IA_NA IAID:1 T1:0 T2:                                                           0) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix ::/56 pltime:0 vltime:0)))

17:43:15.994243 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 1                                                           49) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] d                                                           hcp6 advertise (xid=57014d (client-ID hwaddr type 1 c87f54454368) (server-ID vid                                                            0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a1                                                           2:f43:1300::39cd pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD                                                           -prefix 2a12:f43:1211:3100::/56 pltime:600 vltime:600)))

17:43:18.053348 IP6 (flowlabel 0xd87f1, hlim 1, next-header UDP (17) payload len                                                           gth: 161) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e4 -                                                           > 0x82c1!] dhcp6 request (xid=c5e271 (elapsed-time 0) (option-request opt_82) (c                                                           lient-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigu                                                           re-accept) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39cd pltime:600 vltim                                                           e:600)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:3100::/56 pltim                                                           e:600 vltime:600)))

17:43:18.065873 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 1                                                           49) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] d                                                           hcp6 reply (xid=c5e271 (client-ID hwaddr type 1 c87f54454368) (server-ID vid 000                                                           0058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f4                                                           3:1300::39cd pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-pre                                                           fix 2a12:f43:1211:3100::/56 pltime:600 vltime:600)))
 
Last edited:
klunk said:
I get this
Click to expand...
How long did you run the capture? It’s interesting to me that you don’t see any IPv6 router advertisements. Maybe it’s a different type of IPv6 service that I am unfamiliar with.
 
I think this isp locks you to their modem as it will not work with asus merlin, dd-wrt, openwrt, or opnsense. :(
 
Last edited:
dave14305 said:
How long did you run the capture? It’s interesting to me that you don’t see any IPv6 router advertisements. Maybe it’s a different type of IPv6 service that I am unfamiliar with.
Click to expand...
Apologies I let this one run for 10 min or so

Rich (BB code): 
andy@RT-AX86U_Pro-4368:/tmp/home/root# tcpdump -v -n '(icmp6 and ip[40] == 134) or (udp and port 547)' -i vlan101
tcpdump: listening on vlan101, link-type EN10MB (Ethernet), snapshot length 262144 bytes
21:08:03.094493 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 103) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2aa -> 0xdd30!] dhcp6 solicit (xid=51f4ce (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (reconfigure-accept) (IA_NA IAID:1 T1:0 T2:0) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix ::/56 pltime:0 vltime:0)))
21:08:03.107088 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 advertise (xid=51f4ce (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:08:04.518138 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 161) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e4 -> 0x8140!] dhcp6 request (xid=e4e38c (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:08:04.531420 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 reply (xid=e4e38c (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:13:04.985016 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 157) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e0 -> 0xb04b!] dhcp6 renew (xid=67bc7a (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39f6 pltime:0 vltime:0)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:0 vltime:0)))
21:13:04.998069 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 reply (xid=67bc7a (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:18:05.017001 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 157) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e0 -> 0xe330!] dhcp6 renew (xid=2589d7 (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39f6 pltime:0 vltime:0)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:0 vltime:0)))
21:18:05.031009 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 reply (xid=2589d7 (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
 
klunk said:
Apologies I let this one run for 10 min or so

Rich (BB code): 
andy@RT-AX86U_Pro-4368:/tmp/home/root# tcpdump -v -n '(icmp6 and ip[40] == 134) or (udp and port 547)' -i vlan101
tcpdump: listening on vlan101, link-type EN10MB (Ethernet), snapshot length 262144 bytes
21:08:03.094493 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 103) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2aa -> 0xdd30!] dhcp6 solicit (xid=51f4ce (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (reconfigure-accept) (IA_NA IAID:1 T1:0 T2:0) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix ::/56 pltime:0 vltime:0)))
21:08:03.107088 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 advertise (xid=51f4ce (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:08:04.518138 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 161) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e4 -> 0x8140!] dhcp6 request (xid=e4e38c (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:08:04.531420 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 reply (xid=e4e38c (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:13:04.985016 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 157) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e0 -> 0xb04b!] dhcp6 renew (xid=67bc7a (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39f6 pltime:0 vltime:0)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:0 vltime:0)))
21:13:04.998069 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 reply (xid=67bc7a (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:18:05.017001 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 157) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e0 -> 0xe330!] dhcp6 renew (xid=2589d7 (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39f6 pltime:0 vltime:0)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:0 vltime:0)))
21:18:05.031009 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 reply (xid=2589d7 (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
Click to expand...
You missed a character in the tcpdump filter (ip6).
Code: 
tcpdump -v -n '(icmp6 and ip6[40] == 134) or (udp and port 547)' -i vlan101
 
dave14305 said:
You missed a character in the tcpdump filter (ip6).
Code: 
tcpdump -v -n '(icmp6 and ip6[40] == 134) or (udp and port 547)' -i vlan101
Click to expand...
This one better?

Rich (BB code): 
andy@RT-AX86U_Pro-4368:/tmp/home/root# tcpdump -v -n '(icmp6 and ip6[40] == 134) or (udp and port 547)' -i vlan101
tcpdump: listening on vlan101, link-type EN10MB (Ethernet), snapshot length 262144 bytes
21:54:46.232600 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 103) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2aa -> 0xc8b0!] dhcp6 solicit (xid=970909 (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (reconfigure-accept) (IA_NA IAID:1 T1:0 T2:0) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix ::/56 pltime:0 vltime:0)))
21:54:46.244842 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 advertise (xid=970909 (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:54:47.355104 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 161) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e4 -> 0x9c19!] dhcp6 request (xid=69c92e (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:54:47.367574 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 reply (xid=69c92e (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
21:59:47.673045 IP6 (flowlabel 0x0eb8a, hlim 1, next-header UDP (17) payload length: 157) fe80::daec:5eff:feac:ac12.546 > ff02::1:2.547: [bad udp cksum 0xe2e0 -> 0xd419!] dhcp6 renew (xid=1d98f6 (elapsed-time 0) (option-request opt_82) (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (IA_NA IAID:1 T1:0 T2:0 (IA_ADDR 2a12:f43:1300::39f6 pltime:0 vltime:0)) (IA_PD IAID:830482 T1:0 T2:0 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:0 vltime:0)))
21:59:47.686295 IP6 (class 0x80, hlim 64, next-header UDP (17) payload length: 149) fe80::200:5eff:fe00:5355.547 > fe80::daec:5eff:feac:ac12.546: [udp sum ok] dhcp6 reply (xid=1d98f6 (client-ID hwaddr type 1 c87f54454368) (server-ID vid 0000058331343a62) (reconfigure-accept) (IA_NA IAID:1 T1:300 T2:480 (IA_ADDR 2a12:f43:1300::39f6 pltime:600 vltime:600)) (IA_PD IAID:830482 T1:300 T2:480 (IA_PD-prefix 2a12:f43:1211:4f00::/56 pltime:600 vltime:600)))
^C
 
klunk said:
This one better?
Click to expand...
It’s syntactically correct, but still doesn’t show any Router Advertisements. Perhaps it’s time to Google your ISP name and IPv6 together to see what the deal is. Not all ISPs implement IPv6 correctly or sanely.
 
Not sure why I didn’t offer this earlier, but try to force sending a router solicitation (RS) while running the modified tcpdump below.
Code: 
tcpdump -v -n '(icmp6 and ip6[40] == 134) or (icmp6 and ip6[40] == 133)' -i vlan101
Router solicitation:
Code: 
nvram get ipv6_no_rdisc6
rdisc6 -v -r 2147483647 vlan101
 
dave14305 said:
Not sure why I didn’t offer this earlier, but try to force sending a router solicitation (RS) while running the modified tcpdump below.
Code: 
tcpdump -v -n '(icmp6 and ip6[40] == 134) or (icmp6 and ip6[40] == 133)' -i vlan101
Router solicitation:
Code: 
nvram get ipv6_no_rdisc6
rdisc6 -v -r 2147483647 vlan101
Click to expand...
Hi,
I get this
Rich (BB code): 
andy@RT-AX86U_Pro-4368:/tmp/home/root# tcpdump -v -n '(icmp6 and ip6[40] == 134)
 or (icmp6 and ip6[40] == 133)' -i vlan101
tcpdump: listening on vlan101, link-type EN10MB (Ethernet), snapshot length 2621                                                                          44 bytes
12:51:08.637974 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:16.636199 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:23.638170 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:31.639169 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:38.643139 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:42.166258 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:46.645634 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:46.645747 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:50.649590 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:50.649673 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:55.647136 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:51:55.647227 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payloa                                                                          d length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router s                                                                          olicitation, length 8
12:52:02.648661 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:02.648764 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:10.650190 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:10.650290 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:14.651275 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:14.651359 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:19.649171 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:19.649266 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:26.653185 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:26.653283 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:33.654172 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:33.654266 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:40.653167 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
12:52:40.653260 IP6 (flowlabel 0xd6bc1, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::daec:5eff:feac:ac12 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
 
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