diff --git a/mdb/admin.py b/mdb/admin.py
index ee3ce25..e025f20 100644
--- a/mdb/admin.py
+++ b/mdb/admin.py
@@ -1,5 +1,8 @@
-from mdb.models import *
-from django.contrib import admin
+from django.contrib import admin, messages
+
+from mdb.models import Ip6Address, Interface, Ip4Address, DhcpOption, DhcpCustomField, DomainSrvRecord, DomainTxtRecord, \
+    DomainCnameRecord, DomainARecord, Domain, Host, Ip4Subnet, Ip6Subnet, Nameserver, MailExchange, OperatingSystem, \
+    HostType, DhcpConfig
 
 
 class Ip6AddressInline(admin.TabularInline):
@@ -40,6 +43,26 @@ class HostAdmin(admin.ModelAdmin):
         #                ('kerberos_principal_name', 'kerberos_principal_created_date'))
         # }),
     )
+    actions = ['set_installable']
+
+    def _get_host_warning_message(self, host, ifs):
+        ifs_str = ', '.join([_if.name for _if in ifs])
+        return 'Host {} might not be installable since interface(s) {} has no IP set.'.format(host, ifs_str)
+
+    def set_installable(self, request, queryset):
+        invalid_ifs_per_host = []
+
+        for obj in queryset:
+            invalid_ifs = obj.interface_set.filter(ip4address__isnull=True)
+            if invalid_ifs.exists():
+                invalid_ifs_per_host.append(self._get_host_warning_message(obj, invalid_ifs))
+            obj.pxe_installable = True
+            obj.save()  # triggers post save signal
+
+        if invalid_ifs_per_host:
+            self.message_user(request, message='\n'.join(invalid_ifs_per_host), level=messages.WARNING)
+
+    set_installable.short_description = "Mark selected hosts as PXE installable"
 
     def get_queryset(self, request):
         return super(HostAdmin, self).get_queryset(request).select_related()
diff --git a/mdb/models.py b/mdb/models.py
index b23f135..de99e47 100644
--- a/mdb/models.py
+++ b/mdb/models.py
@@ -53,12 +53,12 @@ class Domain(models.Model):
     def num_records(self):
         host_a_records = Host.objects.filter(interface__domain=self).count()
         size = {
-            "cname": self.domaincnamerecord_set.count(),
-            "srv": self.domainsrvrecord_set.count(),
-            "txt": self.domaintxtrecord_set.count(),
-            "a": self.domainarecord_set.count() + host_a_records
+            "CNAME": self.domaincnamerecord_set.count(),
+            "SRV": self.domainsrvrecord_set.count(),
+            "TXT": self.domaintxtrecord_set.count(),
+            "A": self.domainarecord_set.count() + host_a_records
         }
-        return size
+        return ', '.join(['{}: {}'.format(k, v) for k, v in size.items()])
 
     num_records.short_description = "Num Records"
 
@@ -526,11 +526,11 @@ class Host(models.Model):
 
     def mac_addresses(self):
         addresses = self.interface_set.filter(macaddr__isnull=False).values_list('macaddr', flat=True)
-        return ",".join(addresses)
+        return ", ".join(addresses)
 
     def ip_addresses(self):
         addresses = self.interface_set.filter(ip4address__isnull=False).values_list('ip4address__address', flat=True)
-        return ",".join(addresses)
+        return ", ".join(addresses)
 
     def as_pxe_files(self):
         return host_as_pxe_files(self)
diff --git a/mdb/signals.py b/mdb/signals.py
index d18e467..bd91bbc 100644
--- a/mdb/signals.py
+++ b/mdb/signals.py
@@ -87,21 +87,40 @@ def update_domain_serial_when_change_to_host(sender, instance, created, **kwargs
 
 @receiver(post_save, sender=Host)
 def create_pxe_key_and_write_pxe_files_when_host_changes(sender, instance, created, **kwargs):
-    if not instance.pxe_key:
+    host = instance
+
+    if not host.pxe_key:
         # generate key (prevent infinite recursion by using update)
         pxe_key = uuid.uuid4().hex
-        Host.objects.filter(pk=instance.pk).update(pxe_key=pxe_key)
-        instance.pxe_key = pxe_key
+        Host.objects.filter(pk=host.pk).update(pxe_key=pxe_key)
+        host.pxe_key = pxe_key
 
-    for pxe_file_name, pxe_file in instance.as_pxe_files():
+    for pxe_file_name, pxe_file in host.as_pxe_files():
         path = os.path.join(settings.MDB_PXE_TFTP_ROOT, pxe_file_name)
-        if instance.pxe_installable:
+        if host.pxe_installable:
             with open(path, 'w+') as f:
                 f.write(pxe_file)
                 logger.info("Created or updated {}".format(path))
+
+            # Also set necessary fields for pxe installation
+            interfaces = host.interface_set.exclude(ip4address__isnull=True)
+
+            for _if in interfaces:
+                changed = False
+                if not _if.pxe_filename:
+                    _if.pxe_filename = 'pxelinux.0'  # don't overwrite
+                    changed = True
+                if not _if.dhcp_client:
+                    _if.dhcp_client = True
+                    changed = True
+
+                if changed:
+                    _if.save()
+
         else:
-            os.unlink(path)
-            logger.info("deleted {}".format(path))
+            if os.path.exists(path):
+                os.unlink(path)
+                logger.info("deleted {}".format(path))
 
 
 @receiver(pre_delete, sender=Interface)
diff --git a/mdb/utils.py b/mdb/utils.py
index 19e734b..766d5c1 100644
--- a/mdb/utils.py
+++ b/mdb/utils.py
@@ -68,13 +68,12 @@ def get_pxe_filename(interface, filename_format='mac_addr'):
 
 
 def host_as_pxe_files(host):
-    """ Returns a list of filename,content for each host """
+    """ Returns a list of filename,content for each host interface with an IPv4 address """
     from mdb.models import Host
     assert isinstance(host, Host)
 
     pxe_files = []
-    ifs = host.interface_set.filter(dhcp_client=True)
-    for _if in ifs:
+    for _if in host.interface_set.exclude(ip4address__isnull=True):
         filename = get_pxe_filename(_if)
         content = render_pxelinux_cfg(_if, host)
         pxe_files.append((filename, content))