iptables/tests/ip6tables-t-nat-A-POSTROUTI.../env.sh

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#!/bin/sh
ip netns del cs_client >/dev/null 2>&1
ip link del veth0 >/dev/null 2>&1
ip netns add cs_client
ip link add type veth
ip link set veth1 name eth1 netns cs_client
export cs_client_if1=eth1
export cs_server_if1=veth0
export cs_client_ip1=2001:db8:ffff::1
export cs_server_ip1=2001:db8:ffff::2
ip netns exec cs_client ip link set $cs_client_if1 up
ip link set $cs_server_if1 up
ip netns exec cs_client ip -6 addr add $cs_client_ip1/64 dev $cs_client_if1
ip -6 addr add $cs_server_ip1/64 dev $cs_server_if1
ip netns exec cs_client ifconfig lo up
ifconfig lo up