NAT'ing multiple IPsec clients to the same destination IPSec server

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Way back in 2.0.18 kernel, there was an IPsec connection tracking module
that would allow me to masquerade multiple IPsec clients (eg Cisco VPN
client) all going to the same remote IPsec server onto one external IP
address. This was done with IPsec connection module + ipmasqadm +
ipchains.

I have never been able to get the above to work on iptables. In the
early days of iptables, I also noticed there was no IPsec conntrack
module. 

If I have only 1 external IP address on my firewall/gateway to SNAT to,
is there a way to support multiple IPSec clients on my internal LAN all
establishing IPSec connections to the same destination IPSec server?

Any pointer will be appreciated.

thanks,
patrick
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