Note: in _arp completion I've changed:

_wanted hosts expl 'host' compadd ${${${(f)"$(${words[1]} -a)"}##[ ?(]#}%%[ )]*}

to:

_wanted hosts expl 'host' compadd ${${${(f)"$(${words[1]} -an)"}##[ ?(]#}%%[ )]*}

because arp -a without -n for more entries is very slow due to many DNS
lookups. I suppose this change wouldn't be nice for everyone, so how to
make this configurable? Should I introduce some new zstyle?

And ethtool attached.

-- 
Tomasz Pala <gotar@pld-linux.org>