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diff -up dhcp-4.2.5/client/dhclient.c.stateless-store-duid dhcp-4.2.5/client/dhclient.c
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--- dhcp-4.2.5/client/dhclient.c.stateless-store-duid	2014-12-09 17:29:32.683444318 +0100
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+++ dhcp-4.2.5/client/dhclient.c	2014-12-09 17:30:53.917444318 +0100
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@@ -1151,7 +1151,9 @@ void run_stateless(int exit_mode)
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 		if (default_duid.buffer != NULL)
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 			data_string_forget(&default_duid, MDL);
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-		form_duid(&default_duid, MDL);
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+		if (form_duid(&default_duid, MDL) == ISC_R_SUCCESS &&
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+		    duid_type == DUID_LLT)
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+			write_duid(&default_duid);
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 	}
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 	/* Start a configuration state machine. */