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--- a/sys/src/cmd/ip/ipconfig/dhcp.c

+++ b/sys/src/cmd/ip/ipconfig/dhcp.c

@@ -155,11 +155,25 @@

 	memcpy(requested, defrequested, nrequested);

 }

+static void

+removenulladdr(void)

+{

+	fprint(conf.cfd, "remove %I %M", IPnoaddr, IPnoaddr);

+	atexitdont(removenulladdr);

+}

+

+static void

+addnulladdr(void)

+{

+	atexit(removenulladdr);

+	fprint(conf.cfd, "add %I %M", IPnoaddr, IPnoaddr);

+}

+

 void

 dhcpquery(int needconfig, int startstate)

 {

 	if(needconfig)

-		fprint(conf.cfd, "add %I %M", IPnoaddr, IPnoaddr);

+		addnulladdr();

 	conf.fd = openlisten();

 	if(conf.fd < 0){

@@ -192,8 +206,7 @@

 	close(conf.fd);

 	if(needconfig)

-		fprint(conf.cfd, "remove %I %M", IPnoaddr, IPnoaddr);

-

+		removenulladdr();

 }

 enum {

--- a/sys/src/cmd/ip/ipconfig/main.c

+++ b/sys/src/cmd/ip/ipconfig/main.c

@@ -806,7 +806,7 @@

 {

 	if(strstr(msg, "alarm"))

 		noted(NCONT);

-	noted(NDFLT);

+	exits(msg);

 }

 /* return pseudo-random integer in range low...(hi-1) */

-- 

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