diff --git a/kernel/run.py b/kernel/run.py
index ff588750..1010909f 100644
--- a/kernel/run.py
+++ b/kernel/run.py
@@ -49,6 +49,7 @@ def get_network_config(workers):
         config['tap{}'.format(2*i)] = {
             'mid': i,
             'mac': '56:b4:44:e9:62:d{:x}'.format(i),
+            'ip' : f"172.31.0.1{i}"
         }
     return config
 
@@ -215,8 +216,10 @@ def build_kernel(args):
             build_args = ['build', '--target', KERNEL_TARGET]
             if args.no_kfeatures:
                 build_args += ["--no-default-features"]
+                log(" - enable feature --no-default-features")
             for feature in args.kfeatures:
                 build_args += ['--features', feature]
+                log(" - enable feature {}".format(feature))
             build_args += CARGO_DEFAULT_ARGS
             build_args += CARGO_NOSTD_BUILD_ARGS
             if args.verbose:
@@ -233,6 +236,16 @@ def build_user_libraries(args):
     build_args += ["--features", "rumprt"]
     if args.nic == "virtio-net-pci":
         build_args += ["--features", "virtio"]
+        log(" - enable feature virtio")
+
+    for featurelist in args.ufeatures:
+        for feature in featurelist.split(',') :
+            if ':' in feature:
+                mod_part, feature_part = feature.split(':')
+                if "libvibrio" == mod_part:
+                    log(" - enable feature {}".format(feature_part))
+                    build_args += ['--features', feature_part]
+
     # else: use e1000 / wm0
     build_args += CARGO_DEFAULT_ARGS
     build_args += CARGO_NOSTD_BUILD_ARGS
@@ -259,18 +272,21 @@ def build_userspace(args):
         if not (USR_PATH / module).exists():
             log("User module {} not found, skipping.".format(module))
             continue
+        log("build user-space module {}".format(module))
         with local.cwd(USR_PATH / module):
             with local.env(RUSTFLAGS=USER_RUSTFLAGS):
                 with local.env(RUST_TARGET_PATH=USR_PATH.absolute()):
                     build_args = build_args_default.copy()
-                    for feature in args.ufeatures:
-                        if ':' in feature:
-                            mod_part, feature_part = feature.split(':')
-                            if module == mod_part:
-                                build_args += ['--features', feature_part]
-                        else:
-                            build_args += ['--features', feature]
-                    log("Build user-module {}".format(module))
+                    for featurelist in args.ufeatures:
+                        for feature in featurelist.split(',') :
+                            if ':' in feature:
+                                mod_part, feature_part = feature.split(':')
+                                if module == mod_part:
+                                    log(" - enable feature {}".format(feature_part))
+                                    build_args += ['--features', feature_part]
+                            else:
+                                log(" - enable feature {}".format(feature))
+                                build_args += ['--features', feature]
                     if args.verbose:
                         print("cd {}".format(USR_PATH / module))
                         print("RUSTFLAGS={} RUST_TARGET_PATH={} cargo ".format(
@@ -742,8 +758,10 @@ def configure_network(args):
         assert args.workers <= MAX_WORKERS, "Too many workers, can't configure network"
         sudo[ip[['link', 'add', 'br0', 'type', 'bridge']]]()
         sudo[ip[['addr', 'add', NETWORK_INFRA_IP, 'brd', '+', 'dev', 'br0']]]()
+
         for _, ncfg in zip(range(0, args.workers), NETWORK_CONFIG):
             sudo[tunctl[['-t', ncfg, '-u', user, '-g', group]]]()
+            sudo[ip[['link', 'set',  'address', NETWORK_CONFIG[ncfg]['mac'], 'dev', ncfg]]]()
             sudo[ip[['link', 'set', ncfg, 'up']]](retcode=(0, 1))
             sudo[brctl[['addif', 'br0', ncfg]]]()
         sudo[ip[['link', 'set', 'br0', 'up']]](retcode=(0, 1))
diff --git a/kernel/tests/dhcpd.conf b/kernel/tests/dhcpd.conf
index 26e798af..929c5f1e 100644
--- a/kernel/tests/dhcpd.conf
+++ b/kernel/tests/dhcpd.conf
@@ -5,7 +5,7 @@ option domain-name-servers ns1.example.org, ns2.example.org;
 ddns-update-style none;
 
 subnet 172.31.0.0 netmask 255.255.255.0 {
-  range 172.31.0.12 172.31.0.16;
+  range 172.31.0.118 172.31.0.118;
   option routers 172.31.0.20;
   option subnet-mask 255.255.255.0;
   default-lease-time 1;
@@ -20,4 +20,34 @@ host nrk1 {
 host nrk2 {
   hardware ethernet 56:b4:44:e9:62:d1;
   fixed-address 172.31.0.11;
+}
+
+host nrk3 {
+  hardware ethernet 56:b4:44:e9:62:d2;
+  fixed-address 172.31.0.12;
+}
+
+host nrk4 {
+  hardware ethernet 56:b4:44:e9:62:d3;
+  fixed-address 172.31.0.13;
+}
+
+host nrk5 {
+  hardware ethernet 56:b4:44:e9:62:d4;
+  fixed-address 172.31.0.14;
+}
+
+host nrk6 {
+  hardware ethernet 56:b4:44:e9:62:d5;
+  fixed-address 172.31.0.15;
+}
+
+host nrk7 {
+  hardware ethernet 56:b4:44:e9:62:d6;
+  fixed-address 172.31.0.16;
+}
+
+host nrk8 {
+  hardware ethernet 56:b4:44:e9:62:d7;
+  fixed-address 172.31.0.17;
 }
\ No newline at end of file