neighbor solicitation for ipv6.broadband.voyager.nz

Forums › Voyager › neighbor solicitation for ipv6.broadband.voyager.nz

drivetime

2 posts

Wannabe Geek
+1 received by user: 1

#324241 15-Mar-2026 20:44

my network is looking for ipv6.broadband.voyager.nz but it doesn't exist

tcpdump

Time Source Destination Protocol Info
19:55:28.082454565 kali.1server.nz ff02::1:ff22:a381 ICMPv6 Neighbor Solicitation for 2406:1e00:b910:fc00::22:a381 from f0:92:1c:f4:7a:a0

wireshark

Time Source Destination Protocol Info
19:55:26.137164258 kali.1server.nz ipv6.broadband.voyager.nz TCP 47739 → 80 [ACK] Seq=1 Ack=1 Win=1024 Len=0

kernal logs full of this

2026-03-15T19:56:42.664783+13:00 kali kernel: neighbour: ndisc_cache: neighbor table overflow!

i have /56 & /64 allocations

what other info is needed please?

cheers

edit:

nothing in the openwrt router logs about ipv6.broadband.voyager.nz

yitz

2239 posts

Uber Geek
+1 received by user: 594

#3470687 15-Mar-2026 20:57

Not sure what the issue is, that's just the default reverse DNS name of their IPs?

Firebirdnz

37 posts

Geek
+1 received by user: 66

Trusted

Voyager

#3470711 16-Mar-2026 08:22

Hey there!

Everything looks correct aside from this:

"2026-03-15T19:56:42.664783+13:00 kali kernel: neighbour: ndisc_cache: neighbor table overflow!"

Seems like your Kali server is trying to do neighbor discovery on more endpoints than it has capacity for. Typically a LAN segment/VLAN should be configured with a /64 subnet. If you have configured your LAN for the whole /56 then your host may be misbehaving and trying to discover more than it should. Alternatively, as Kali is more of a security toolbox linux OS do you perhaps have a process running to do LAN discovery? That could be burning through your neighbour cache.

drivetime

2 posts

Wannabe Geek
+1 received by user: 1

#3470796 16-Mar-2026 11:00

I found the designated master in the lan dhcp6 settings in the router wasn't on :)

good that kali picks up these anomalies

thanks guys for your help, much appreciated