14 lines
995 B
Plaintext
14 lines
995 B
Plaintext
The peers <b>carol</b> and <b>moon</b> both have dynamic IP addresses, so that the remote end
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is defined symbolically by <b>right=<hostname></b>. The ipsec starter resolves the
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fully-qualified hostname into the current IP address via a DNS lookup (simulated by an
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/etc/hosts entry). Since the peer IP addresses are expected to change over time, the option
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<b>rightallowany=yes</b> will allow an IKE main mode rekeying to arrive from an arbitrary
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IP address under the condition that the peer identity remains unchanged. When this happens
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the old tunnel is replaced by an IPsec connection to the new origin.
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<p>
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In this scenario <b>moon</b> first initiates a tunnel to <b>carol</b>. After some time
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the responder <b>carol</b> suddenly changes her IP address and restarts the connection to
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<b>moon</b> without deleting the old tunnel first (simulated by iptables blocking IKE packets
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to and from <b>carol</b> and starting the connection from host <b>dave</b> using
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<b>carol</b>'s identity).
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