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I installed OpenWrt on my router and I wanted to get MAC address of some machine connected to it. With ipv4 I would use arp command. But I want to resolve HW address knowing ipv6 addr. I have read that ipv6 has ndp protocol replacing arp and the command to lookup MAC table is ip -6 neigh show, but the problem is BusyBox in my OpenWrt does not have ip command and i am not sure if installing some package can bring it. So I wonder if there is any way to check MAC table for ipv6? Maybe I can just cat some file?

Edit: I installed ip package with opkg manager so now i can use ip -6 neigh show, but I'm still wondering if I can get the same info using cat somefile?

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You can use install ndpmon package:

apt-get install ndpmon ndpmon - IPv6 Neighbor Discovery Protocol Monitor root@lvm:/home/mohsen# dpkg -L ndpmon /. /etc /etc/init.d /etc/init.d/ndpmon /etc/default /etc/default/ndpmon /etc/ndpmon /etc/ndpmon/config_ndpmon.dtd /etc/ndpmon/config_ndpmon.xml /usr /usr/lib /usr/lib/ndpmon /usr/lib/ndpmon/plugins /usr/lib/ndpmon/plugins/mac_resolv /usr/lib/ndpmon/plugins/mac_resolv/README /usr/lib/ndpmon/plugins/mac_resolv/wka.tmpl /usr/lib/ndpmon/plugins/mac_resolv/manuf.tmpl /usr/lib/ndpmon/plugins/mac_resolv/manuf /usr/lib/ndpmon/plugins/countermeasures /usr/lib/ndpmon/plugins/countermeasures/icmp_lib.dox /usr/lib/ndpmon/plugins/countermeasures/countermeasures.dox /usr/lib/ndpmon/create_html_table.py /usr/share /usr/share/man /usr/share/man/man8 /usr/share/man/man8/config_ndpmon.xml.8.gz /usr/share/man/man8/ndpmon.8.gz /usr/share/doc /usr/share/doc/ndpmon /usr/share/doc/ndpmon/changelog.Debian.gz /usr/share/doc/ndpmon/copyright /usr/share/doc/ndpmon/examples /usr/share/doc/ndpmon/examples/demopipeprogram.pl.sample /usr/share/doc/ndpmon/README /usr/share/doc/ndpmon/changelog.gz /usr/share/lintian /usr/share/lintian/overrides /usr/share/lintian/overrides/ndpmon /usr/share/python-support /usr/share/python-support/ndpmon.private /usr/sbin /usr/sbin/ndpmon /var /var/lib /var/lib/ndpmon /var/lib/ndpmon/neighbor_list.xml /var/lib/ndpmon/neighbor_list.dtd /var/lib/ndpmon/alerts.xml root@lvm:/home/mohsen# man ndpmon root@lvm:/home/mohsen# apt-cache search ndpmon ndpmon - IPv6 Neighbor Discovery Protocol Monitor
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    Unknown package 'ndpmon'. There is no ndpmon for OpenWrt :) But i installed ip with opkg install ip and now can apply ip -6 neigh show. Anyway im still wondering if i can cat some file to get same info. Commented Feb 22, 2015 at 15:00
  • ndpmon.sourceforge.net Commented Feb 22, 2015 at 18:01

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