diff -up iputils-s20070202/Makefile.infiniband iputils-s20070202/Makefile
--- iputils-s20070202/Makefile.infiniband	2008-02-18 16:47:39.000000000 +0100
+++ iputils-s20070202/Makefile	2008-02-18 16:47:39.000000000 +0100
@@ -37,6 +37,8 @@ rdisc_srv: rdisc_srv.o
 rdisc_srv.o: rdisc.c
 	$(CC) $(CFLAGS) -DRDISC_SERVER -o rdisc_srv.o rdisc.c
 
+arping: arping.o
+	$(CC) $(LDFLAGS) arping.o $(LOADLIBES) $(LDLIBS) -lsysfs -o arping
 
 check-kernel:
 ifeq ($(KERNEL_INCLUDE),)
diff -up iputils-s20070202/arping.c.infiniband iputils-s20070202/arping.c
--- iputils-s20070202/arping.c.infiniband	2008-02-18 16:47:39.000000000 +0100
+++ iputils-s20070202/arping.c	2008-02-18 16:50:44.000000000 +0100
@@ -31,6 +31,7 @@
 #include <string.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <sysfs/libsysfs.h>
 
 #include "SNAPSHOT.h"
 
@@ -50,8 +51,13 @@ int unicasting;
 int s;
 int broadcast_only;
 
-struct sockaddr_ll me;
-struct sockaddr_ll he;
+/*
+ * Make these two structs have padding at the end so the overly long Infiniband
+ * hardware addresses can have the remainder of their address tacked onto
+ * the end of the struct without overlapping anything.
+ */
+struct sockaddr_ll me[2];
+struct sockaddr_ll he[2];
 
 struct timeval start, last;
 
@@ -124,7 +130,8 @@ int send_pack(int s, struct in_addr src,
 	p+=4;
 
 	gettimeofday(&now, NULL);
-	err = sendto(s, buf, p-buf, 0, (struct sockaddr*)HE, sizeof(*HE));
+	err = sendto(s, buf, p-buf, 0, (struct sockaddr*)HE, (ah->ar_hln > 8) ?
+		     sizeof(*HE) + ah->ar_hln - 8 : sizeof(*HE));
 	if (err == p-buf) {
 		last = now;
 		sent++;
@@ -172,7 +179,7 @@ void catcher(void)
 		finish();
 
 	if (last.tv_sec==0 || MS_TDIFF(tv,last) > 500) {
-		send_pack(s, src, dst, &me, &he);
+		send_pack(s, src, dst, &me[0], &he[0]);
 		if (count == 0 && unsolicited)
 			finish();
 	}
@@ -219,7 +226,7 @@ int recv_pack(unsigned char *buf, int le
 		return 0;
 	if (ah->ar_pln != 4)
 		return 0;
-	if (ah->ar_hln != me.sll_halen)
+	if (ah->ar_hln != me[0].sll_halen)
 		return 0;
 	if (len < sizeof(*ah) + 2*(4 + ah->ar_hln))
 		return 0;
@@ -230,7 +237,7 @@ int recv_pack(unsigned char *buf, int le
 			return 0;
 		if (src.s_addr != dst_ip.s_addr)
 			return 0;
-		if (memcmp(p+ah->ar_hln+4, &me.sll_addr, ah->ar_hln))
+		if (memcmp(p+ah->ar_hln+4, &me[0].sll_addr, ah->ar_hln))
 			return 0;
 	} else {
 		/* DAD packet was:
@@ -248,7 +255,7 @@ int recv_pack(unsigned char *buf, int le
 		 */
 		if (src_ip.s_addr != dst.s_addr)
 			return 0;
-		if (memcmp(p, &me.sll_addr, me.sll_halen) == 0)
+		if (memcmp(p, &me[0].sll_addr, me[0].sll_halen) == 0)
 			return 0;
 		if (src.s_addr && src.s_addr != dst_ip.s_addr)
 			return 0;
@@ -264,7 +271,7 @@ int recv_pack(unsigned char *buf, int le
 			printf("for %s ", inet_ntoa(dst_ip));
 			s_printed = 1;
 		}
-		if (memcmp(p+ah->ar_hln+4, me.sll_addr, ah->ar_hln)) {
+		if (memcmp(p+ah->ar_hln+4, me[0].sll_addr, ah->ar_hln)) {
 			if (!s_printed)
 				printf("for ");
 			printf("[");
@@ -290,7 +297,7 @@ int recv_pack(unsigned char *buf, int le
 	if (quit_on_reply)
 		finish();
 	if(!broadcast_only) {
-		memcpy(he.sll_addr, p, me.sll_halen);
+		memcpy(he[0].sll_addr, p, me[0].sll_halen);
 		unicasting=1;
 	}
 	return 1;
@@ -459,9 +466,9 @@ main(int argc, char **argv)
 		close(probe_fd);
 	};
 
-	me.sll_family = AF_PACKET;
-	me.sll_ifindex = ifindex;
-	me.sll_protocol = htons(ETH_P_ARP);
+	me[0].sll_family = AF_PACKET;
+	me[0].sll_ifindex = ifindex;
+	me[0].sll_protocol = htons(ETH_P_ARP);
 	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
 		perror("bind");
 		exit(2);
@@ -474,14 +481,37 @@ main(int argc, char **argv)
 			exit(2);
 		}
 	}
-	if (me.sll_halen == 0) {
+	if (me[0].sll_halen == 0) {
 		if (!quiet)
 			printf("Interface \"%s\" is not ARPable (no ll address)\n", device);
 		exit(dad?0:2);
 	}
-
-	he = me;
-	memset(he.sll_addr, -1, he.sll_halen);
+	he[0] = me[0];
+	he[1] = me[1];
+	{
+		struct sysfs_class_device *dev;
+		struct sysfs_attribute *brdcast;
+		char *next_ch;
+
+		dev = sysfs_open_class_device("net", device);
+		if (!dev) {
+			perror("sysfs class device");
+			exit(2);
+		}
+		brdcast = sysfs_get_classdev_attr(dev, "broadcast");
+		if (!brdcast) {
+			perror("sysfs attribute broadcast");
+			exit(2);
+		}
+		if (sysfs_read_attribute(brdcast)) {
+			perror("sysfs read brdcast");
+			exit(2);
+		}
+		for (ch=0; ch<he[0].sll_halen; ch++) {
+			he[0].sll_addr[ch] = strtol(brdcast->value + (ch*3),
+						    &next_ch, 16);
+		}
+	}
 
 	if (!quiet) {
 		printf("ARPING %s ", inet_ntoa(dst));
@@ -501,7 +531,7 @@ main(int argc, char **argv)
 	while(1) {
 		sigset_t sset, osset;
 		unsigned char packet[4096];
-		struct sockaddr_ll from;
+		struct sockaddr_ll from[2];
 		socklen_t alen = sizeof(from);
 		int cc;
 
@@ -514,7 +544,7 @@ main(int argc, char **argv)
 		sigaddset(&sset, SIGALRM);
 		sigaddset(&sset, SIGINT);
 		sigprocmask(SIG_BLOCK, &sset, &osset);
-		recv_pack(packet, cc, &from);
+		recv_pack(packet, cc, &from[0]);
 		sigprocmask(SIG_SETMASK, &osset, NULL);
 	}
 }