diff -x CVS -Nru /mnt/marcus/gnu/cvs/hurd/pfinet/Makefile pfinet/Makefile
--- /mnt/marcus/gnu/cvs/hurd/pfinet/Makefile	Sat Feb  5 19:32:57 2000
+++ pfinet/Makefile	Sat Sep 30 23:00:30 2000
@@ -61,7 +61,7 @@
 LINUXSRCS	= $(core-srcs) $(ethernet-srcs) $(ipv4-srcs) $(arch-lib-srcs)
 SRCS		= sched.c timer-emul.c socket.c main.c ethernet.c \
 		  io-ops.c socket-ops.c misc.c time.c options.c loopback.c \
-		  kmem_cache.c stubs.c
+		  kmem_cache.c stubs.c dummy.c
 MIGSRCS		= ioServer.c socketServer.c startup_notifyServer.c
 OBJS		:= $(patsubst %.c,%.o,$(LINUXSRCS) $(SRCS) $(MIGSRCS))
 LCLHDRS		= config.h mapped-time.h mutations.h pfinet.h
diff -x CVS -Nru /mnt/marcus/gnu/cvs/hurd/pfinet/dummy.c pfinet/dummy.c
--- /mnt/marcus/gnu/cvs/hurd/pfinet/dummy.c	Thu Jan  1 01:00:00 1970
+++ pfinet/dummy.c	Sat Sep 30 22:58:20 2000
@@ -0,0 +1,122 @@
+/*
+   Copyright (C) 1995,96,98,99,2000 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell, p/BSG.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#include "pfinet.h"
+
+#include <device/device.h>
+#include <device/net_status.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <error.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+
+
+extern struct device ether_dev;
+
+struct net_device_stats *
+dummy_get_stats (struct device *dev)
+{
+  struct net_device_stats *stats = (struct net_device_stats *) dev->priv;
+  return stats;
+}
+
+int
+dummy_stop (struct device *dev)
+{
+  return 0;
+}
+
+void
+dummy_set_multi (struct device *dev)
+{
+}
+
+int
+dummy_open (struct device *dev)
+{
+  return 0;
+}
+
+int
+dummy_xmit (struct sk_buff *skb, struct device *dev)
+{
+  struct net_device_stats *stats = (struct net_device_stats *)dev->priv;
+
+  stats->tx_packets++;
+  stats->tx_bytes += skb->len;
+
+  dev_kfree_skb (skb);
+  return 0;
+}
+
+void
+setup_dummy_device (char *name)
+{
+  error_t err;
+ 
+  bzero (&ether_dev, sizeof ether_dev);
+
+  ether_dev.name = strdup (name);
+
+  ether_dev.priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
+  if (ether_dev.priv == NULL)
+    return ENOMEM;
+  memset(ether_dev.priv, 0, sizeof(struct net_device_stats));
+  ether_dev.get_stats = dummy_get_stats;
+
+  ether_dev.open = dummy_open;
+  ether_dev.stop = dummy_stop;
+  ether_dev.hard_start_xmit = dummy_xmit;
+  ether_dev.set_multicast_list = dummy_set_multi;
+
+  /* These are the ones set by drivers/net/net_init.c::ether_setup.  */
+  ether_dev.hard_header = eth_header;
+  ether_dev.rebuild_header = eth_rebuild_header;
+  ether_dev.hard_header_cache = eth_header_cache;
+  ether_dev.header_cache_update = eth_header_cache_update;
+  ether_dev.hard_header_parse = eth_header_parse;
+  /* We can't do these two (and we never try anyway).  */
+  /* ether_dev.change_mtu = eth_change_mtu; */
+  /* ether_dev.set_mac_address = eth_mac_addr; */
+
+  /* Some more fields */
+  ether_dev.type = ARPHRD_ETHER;
+  ether_dev.hard_header_len = ETH_HLEN;
+  ether_dev.addr_len = ETH_ALEN;
+  memset (ether_dev.broadcast, 0xff, ETH_ALEN);
+  ether_dev.flags = IFF_BROADCAST | IFF_MULTICAST;
+  dev_init_buffers (&ether_dev);
+
+  ether_dev.mtu = 1500;
+  ether_dev.tx_queue_len = 0;
+  ether_dev.flags |= IFF_NOARP;
+  ether_dev.flags &= ~IFF_MULTICAST;
+
+  /* That should be enough.  */
+
+  /* This call adds the device to the `dev_base' chain,
+     initializes its `ifindex' member (which matters!),
+     and tells the protocol stacks about the device.  */
+  err = - register_netdevice (&ether_dev);
+  assert_perror (err);
+}
diff -x CVS -Nru /mnt/marcus/gnu/cvs/hurd/pfinet/main.c pfinet/main.c
--- /mnt/marcus/gnu/cvs/hurd/pfinet/main.c	Sat Mar 18 19:37:15 2000
+++ pfinet/main.c	Sat Sep 30 22:57:35 2000
@@ -143,7 +147,14 @@
 
   name = already_open = strdup (name);
 
-  setup_ethernet_device (name);
+  if (!strcmp(name, "dummy"))
+    {
+      setup_dummy_device (name);
+    }
+  else
+    {
+      setup_ethernet_device (name);
+    }
 
   /* Turn on device. */
   dev_open (&ether_dev);
diff -x CVS -Nru /mnt/marcus/gnu/cvs/hurd/pfinet/pfinet.h pfinet/pfinet.h
--- /mnt/marcus/gnu/cvs/hurd/pfinet/pfinet.h	Wed Feb  9 22:59:19 2000
+++ pfinet/pfinet.h	Sat Sep 30 22:13:52 2000
@@ -57,6 +57,7 @@
 void ethernet_initialize (void);
 int ethernet_demuxer (mach_msg_header_t *, mach_msg_header_t *);
 void setup_ethernet_device (char *);
+void setup_dummy_device (char *);
 struct sock_user *make_sock_user (struct socket *, int, int, int);
 error_t make_sockaddr_port (struct socket *, int,
 			    mach_port_t *, mach_msg_type_name_t *);