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diff --git a/selftest/ns/start_in_ns.sh b/selftest/ns/start_in_ns.sh
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+++ b/selftest/ns/start_in_ns.sh
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+#!/bin/sh
+#
+# Starts samba in a separate namespace. This gets passed the interface/IP
+# to use, as well as the Samba command to run. The whole script gets run
+# (via unshare) in a separate namespace.
+
+# the first 3 args are our interface-name, parent-PID, and a exports file
+# containing environment variables ($SERVER, $SERVER_IP, etc)
+interface=$1
+exports_file=$2
+parent_pid=$3
+
+# we write the testenv environment variables to file, which makes it easier
+# to work out the $SERVER, $SERVER_IP, etc
+. $exports_file
+
+# The namespaces we use are anonymous, which means other processes would need
+# to use our PID to access the new namespace
+echo "-------------------------------------------------------------"
+echo "Created namespace for $NETBIOSNAME ($ENVNAME) PID $$"
+
+# generate a helper script if the developer wants to talk to this namespace
+# in another shell
+mk_nsenter_script="$(dirname $0)/mk_nsenter.sh"
+helper_script=$($mk_nsenter_script $$ $exports_file)
+
+echo "To communicate with this testenv, use: $helper_script"
+echo "-------------------------------------------------------------"
+
+# the rest of the args are the samba command to run
+shift 3
+SAMBA_CMD=$@
+
+# make sure namespace loopback is up (it's needed for ping, etc)
+ip link set dev lo up
+
+# Create the interfaces needed for communication between namespaces.
+# We use a veth pair, which acts as a tunnel between the namespaces.
+# One end of the veth link is added to a common bridge in the top-level (i.e.
+# selftest) namespace, and the other end is added to the testenv's namespace.
+# This means each testenv DC is in its own namespace, but they can talk to
+# each other via the common bridge interface.
+# The new veth interfaces are named "vethX" and "vethX-br", where
+# X = the testenv IP (i.e. Samba::get_interface()). E.g. ad_dc = veth30,
+# and veth30-br.
+# The "vethX" interface will live in the new testenv's namespace.
+# The "vethX-br" end is added to the bridge in the main selftest namespace.
+ip link add dev $interface-br type veth peer name $interface
+
+# move the bridge end of the link back into the parent namespace.
+ip link set $interface-br netns $parent_pid
+
+# configure our IP address and bring the interface up
+ip addr add $SERVER_IP/24 dev $interface
+# Note that samba can't bind to the IPv6 address while DAD is in progress,
+# so we use 'nodad' when configuring the address
+ip addr add $SERVER_IPV6/112 dev $interface nodad
+ip link set dev $interface up
+
+# start samba
+$SAMBA_CMD