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<!-- $Id: network-console.xml 31173 2005-10-05 12:03:55Z holger-guest $ -->
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<!-- $Id: network-console.xml 50787 2008-01-07 21:25:15Z fjp $ -->
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<sect3 id="network-console">
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<title>Installation Over the Network</title>
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</para><note><para>
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The <command>ssh</command> server in the installer uses a default
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configuration that does not send keep-alive packets. In principle,
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a connection to the system being installed should be kept open
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indefinitely. However, in some situations — depending on your
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local network setup — the connection may be lost after some
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period of inactivity. One common case where this can happen is when
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there is some form of Network Address Translation (NAT) somewhere
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between the client and the system being installed. Depending on at
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which point of the installation the connection was lost, you may or
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may not be able to resume the installation after reconnecting.
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You may be able to avoid the connection being dropped by adding the option
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<userinput>-o ServerAliveInterval=<replaceable>value</replaceable></userinput>
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when starting the <command>ssh</command> connection, or by adding that
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option in your <command>ssh</command> configuration file. Note however
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that in some cases adding this option may also <emphasis>cause</emphasis>
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a connection to be dropped (for example if keep-alive packets are sent
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during a brief network outage, from which <command>ssh</command> would
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otherwise have recovered), so it should only be used when needed.
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If you install several computers in turn and they happen to have the
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same IP address or hostname, <command>ssh</command> will refuse to connect
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to such host. The reason is that it will have different fingerprint, which
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is usually a sign of a spoofing attack. If you are sure this is not the
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case, you will need to delete the relevant line from
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<filename>~/.ssh/known_hosts</filename> and try again.
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<filename>~/.ssh/known_hosts</filename><footnote>
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The following command will remove an existing entry for a host:
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<command>ssh-keygen -R <<replaceable>hostname</replaceable>|<replaceable>IP address</replaceable>></command>.
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</footnote> and try again.
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</para></note><para>