Package: radvd

"radvd" package binaries on CentOS:

/usr/sbin/radvd /usr/sbin/radvdump

You may install this package on CentOS with yum install radvd

"radvd" package binaries on Debian:

/usr/sbin/radvd /usr/sbin/radvdump

You may install this package on Debian with apt-get install radvd