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HAProxy is able to do the PIv6 IPv6 to IPv4 proxying. With simple configuration lines it is possible to proxy connections between the two protocols.

A basic Layer 4 TCP config:

global
    user haproxy
    group haproxy
    daemon
    log /dev/log daemon

defaults
    timeout client 5000
    timeout connect 5000
    timeout server 10000

listen webserver1
    bind 2001:db8:abc:123::cafe:80
    mode tcp
    server webserver1 192.0.2.1:80

A basic Layer 7 HTTP config:

listen webserver1
    bind 2001:db8:abc:123::cafe:80
    mode http
    option forwardfor
    server webserver1 192.0.2.1:80
 
listen webserver1-ssl-passthrough
    bind 2001:db8:abc:123::cafe:443
    mode tcp
    server webserver1 192.0.2.1:443

Future Enhancement

• Support for Network ACL to allow ingress/egress traffic for an external network. For this a network administration facility could be introduced in ACS (low pro)

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