[TriLUG] IPv6 equivalent to dhclient list

[Aaron Joyner]

$ ip -6 neighbor

On Tue, Jan 6, 2015 at 8:46 PM, Alan Porter <porter at trilug.org> wrote:

>
> My home router is a small Linux box, a 2008-era "Fit PC 1.0".
> It runs a few basic services, including dnsmasq, a DNS/DHCP
> server.  Dnsmasq is in charge of allocating IPv4 addresses
> to all devices in the house.  For IPv6, I have radvd, which
> advertises my home subnet and route info.
>
> I have a simple web CGI script that shows a web page with a
> list of clients who are on the home network.  Basically, it
> reads /var/lib/dnsmasq.leases and shows that info in a tidy
> little grid.
>
> lease time   mac addr             ip addr        host name
> 0:09:10      6c:40:08:a3:b9:2e    172.31.1.57    hedwig
> 0:05:34      00:27:10:b7:79:90 172.31.1.56    xps
> 0:07:41      00:13:ef:d5:27:f8    172.31.1.31    garagepi
>
> ...and so on.
>
> I'd like to add IPv6 hosts to that list, but I don't know how
> to get that info from my router, or if it even knows.
>
> How would I find the IPv6 machines on my network?  Do they
> leave some trail when they do their little dance with radvd?
> Is there some IPv6 equivalent to the ARP table (is it ndp)?
>
> I hope I don't end up doing something crazy, like logging
> IP addresses with an ip6tables rule, and using that somehow!
> Or writing a script that monitors "ip -6 neighbor show" and
> keeps a lookup table.  And I really hope I don't have to do
> some stunt that requires me to find the host on IPv4 before
> I can look him up on IPv6!
>
> Ideas?
>
>
> Alan
>
>
>
>
>
>
> --
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