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Strongswan

The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each 
to gateway <b>moon</b> using the <b>MODP Diffie-Hellman Groups 22, 23, and 24</b>
with <b>Prime Order Subgroups</b>.
<p/>
<b>carol</b> proposes the DH groups MODP_2048_224 and MODP_1024_160 whereas
<b>dave</b> proposes MODP_2048_224 and MODP_2048_256.
Since <b>moon</b> does not support MODP_2048_224 the roadwarriors fall back to
MODP_1024_160 and MODP_2048_256, respectively.
<p/>
Upon the successful establishment of the IPsec tunnels, <b>leftfirewall=yes</b>
automatically inserts iptables-based firewall rules that let pass the tunneled traffic.
In order to test both tunnel and firewall, both <b>carol</b> and <b>dave</b> ping
the client <b>alice</b> behind the gateway <b>moon</b>.