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diff -up dhcp-4.3.4/client/dhclient.c.stateless-DUID-LLT dhcp-4.3.4/client/dhclient.c
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--- dhcp-4.3.4/client/dhclient.c.stateless-DUID-LLT	2016-04-29 13:13:50.467360008 +0200
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+++ dhcp-4.3.4/client/dhclient.c	2016-04-29 13:14:53.389375428 +0200
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@@ -1317,6 +1317,9 @@ void run_stateless(int exit_mode, u_int1
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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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 #ifdef DHCP4o6