Here's the script that adds a link-local address to an arbitrary interface.
You'll need the ``ahcp-compute-address'' utility, which you'll find in the
ahcpd distribution.
Juliusz
#!/bin/sh
die() { echo "$0: $@" >&2; exit 1; }
warn() { echo "$0: warning: $@" >&2; }
if [ "$#" -ne 1 ] ; then
die "Usage: $0 interface"
fi
if (ip addr show dev $1 | grep -q '^ *inet6 *fe80:') ; then
die "interface $1 already has a link-local address"
fi
mac="$(ip addr show dev $1 | grep '^ *link/ether ' | sed -e 's|^ *link/ether \([0-9a-z:]*\) .*$|\1|' -e q)"
if [ -z "$mac" ] ; then
warn "couldn't find MAC address"
fi
addr=$(ahcp-generate-address fe80:: $mac)
ip -6 addr add "$addr"/64 dev $1
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