Hello, After many years of managing wireless with Debian's ifupdown + wpa_supplicant, I tried iwd, and I love it so far: I really appreciate its polish, cleanliness, and responsiveness. Thanks much for this software! There seems to be a problem with its IPv6 support: on my system (Debian Sid, iwd 1.19 from distro repo), iwd works perfectly out of the box, and continues to work with "EnableNetworkConfiguration=True", but with "EnableIPv6=true", it segfaults immediately upon connect. (This is especially awkward when iwd is being managed by systemd, since I then get an endless loop of the daemon crashing and immediately restarting, with a steady stream of messages hitting syslog ;)) FWIW, some Arch users have reported similar issues: https://bugs.archlinux.org/task/71718 Here's my debug output: ***** root@lila:~# /usr/libexec/iwd -d Wireless daemon version 1.19 src/main.c:main() Using configuration directory /etc/iwd Loaded configuration from /etc/iwd/main.conf src/storage.c:storage_create_dirs() Using state directory /var/lib/iwd src/main.c:nl80211_appeared() Found nl80211 interface src/module.c:iwd_modules_init() src/wsc.c:wsc_init() src/resolve.c:resolve_resolvconf_init() Trying to find resolvconf in $PATH src/resolve.c:resolve_resolvconf_init() resolvconf found as: /sbin/resolvconf src/eap.c:__eap_method_enable() src/eap-wsc.c:eap_wsc_init() src/eap-md5.c:eap_md5_init() src/eap-tls.c:eap_tls_init() src/eap-ttls.c:eap_ttls_init() src/eap-mschapv2.c:eap_mschapv2_init() src/eap-sim.c:eap_sim_init() src/eap-aka.c:eap_aka_prime_init() src/eap-aka.c:eap_aka_init() src/eap-peap.c:eap_peap_init() src/eap-gtc.c:eap_gtc_init() src/eap-pwd.c:eap_pwd_init() src/manager.c:manager_wiphy_dump_callback() New wiphy phy0 added (0) Wiphy: 0, Name: phy0 Permanent Address: xx:xx:xx:xx:xx:xx 2.4Ghz Band: Bitrates (non-HT): 1.0 Mbps 2.0 Mbps 5.5 Mbps 11.0 Mbps 6.0 Mbps 9.0 Mbps 12.0 Mbps 18.0 Mbps 24.0 Mbps 36.0 Mbps 48.0 Mbps 54.0 Mbps HT Capabilities: HT40 Short GI for 20Mhz Short GI for 40Mhz HT RX MCS indexes: 0-15 5Ghz Band: Bitrates (non-HT): 6.0 Mbps 9.0 Mbps 12.0 Mbps 18.0 Mbps 24.0 Mbps 36.0 Mbps 48.0 Mbps 54.0 Mbps HT Capabilities: HT40 Short GI for 20Mhz Short GI for 40Mhz HT RX MCS indexes: 0-15 VHT Capabilities: Short GI for 80Mhz Max RX MCS: 0-9 for NSS: 2 Max TX MCS: 0-9 for NSS: 2 Ciphers: CCMP TKIP BIP Supported iftypes: ad-hoc station ap p2p-client p2p-go p2p-device src/manager.c:manager_create_interfaces() creating wlan0 src/manager.c:manager_create_interfaces() creating wlan0-p2p src/wiphy.c:wiphy_update_reg_domain() New reg domain country code for phy0 is US src/manager.c:manager_config_notify() Notification of command New Interface(7) src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/manager.c:manager_new_station_interface_cb() src/netdev.c:netdev_create_from_genl() Created interface wlan0[13 a] src/manager.c:manager_config_notify() Notification of command New Interface(7) src/manager.c:manager_new_p2p_interface_cb() src/p2p.c:p2p_device_update_from_genl() Created P2P device b src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/wiphy.c:wiphy_reg_notify() Notification of command Wiphy Reg Change(113) src/wiphy.c:wiphy_update_reg_domain() New reg domain country code for phy0 is XX src/netdev.c:netdev_set_4addr() netdev: 13 use_4addr: 0 src/netdev.c:netdev_initial_up_cb() Interface 13 initialized src/netconfig.c:netconfig_new() Starting netconfig for interface: 13 src/station.c:station_enter_state() Old State: disconnected, new state: autoconnect_quick src/wiphy.c:wiphy_radio_work_insert() Inserting work item 1 src/wiphy.c:wiphy_radio_work_next() Starting work item 1 src/rrm.c:rrm_add_frame_watches() src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/manager.c:manager_config_notify() Notification of command Set Interface(6) src/scan.c:scan_notify() Scan notification Trigger Scan(33) src/scan.c:scan_request_triggered() Active scan triggered for wdev a src/station.c:station_quick_scan_triggered() Quick scan triggered for wlan0 src/wiphy.c:wiphy_reg_notify() Notification of command Wiphy Reg Change(113) src/wiphy.c:wiphy_update_reg_domain() New reg domain country code for phy0 is US src/scan.c:scan_notify() Scan notification New Scan Results(34) src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/scan.c:get_scan_callback() get_scan_callback src/scan.c:scan_parse_bss_information_elements() Load: 0/255 src/scan.c:get_scan_callback() get_scan_callback src/scan.c:scan_parse_bss_information_elements() Load: 66/255 src/scan.c:get_scan_callback() get_scan_callback src/scan.c:scan_parse_bss_information_elements() Load: 212/255 src/scan.c:get_scan_callback() get_scan_callback src/scan.c:scan_parse_bss_information_elements() Load: 43/255 src/scan.c:scan_parse_advertisement_protocol() src/scan.c:get_scan_callback() get_scan_callback src/scan.c:scan_parse_bss_information_elements() Load: 206/255 src/scan.c:get_scan_callback() get_scan_callback src/scan.c:scan_parse_bss_information_elements() Load: 205/255 src/scan.c:get_scan_callback() get_scan_callback src/scan.c:get_scan_callback() get_scan_callback src/scan.c:get_scan_callback() get_scan_callback src/scan.c:get_scan_callback() get_scan_callback src/scan.c:scan_parse_bss_information_elements() Load: 68/255 src/scan.c:get_scan_callback() get_scan_callback src/scan.c:get_scan_callback() get_scan_callback src/scan.c:get_scan_callback() get_scan_callback src/scan.c:scan_parse_bss_information_elements() Load: 19/255 src/scan.c:get_scan_done() get_scan_done ... src/station.c:station_autoconnect_start() src/station.c:station_autoconnect_next() autoconnect: Trying SSID: nnnnnnnn src/station.c:station_autoconnect_next() autoconnect: 'xx:xx:xx:xx:xx:xx' freq: 5180, rank: 13107, strength: -6300 src/netdev.c:netdev_cqm_rssi_update() src/wiphy.c:wiphy_radio_work_insert() Inserting work item 2 src/station.c:__station_connect_network() connecting to BSS xx:xx:xx:xx:xx:xx src/station.c:station_enter_state() Old State: autoconnect_quick, new state: connecting (auto) src/scan.c:scan_cancel() Trying to cancel scan id 1 for wdev a src/wiphy.c:wiphy_radio_work_done() Work item 1 done src/wiphy.c:wiphy_radio_work_next() Starting work item 2 src/netdev.c:netdev_mlme_notify() MLME notification New Station(19) src/station.c:station_netdev_event() Associating src/netdev.c:netdev_mlme_notify() MLME notification Authenticate(37) src/netdev.c:netdev_authenticate_event() src/netdev.c:netdev_mlme_notify() MLME notification Associate(38) src/netdev.c:netdev_associate_event() src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/netdev.c:netdev_mlme_notify() MLME notification Connect(46) src/netdev.c:netdev_connect_event() src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/netdev.c:netdev_get_oci_cb() Obtained OCI: freq: 5180, width: 3, center1: 5210, center2: 0 src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/netdev.c:netdev_unicast_notify() Unicast notification Control Port Frame(129) src/netdev.c:netdev_control_port_frame_event() src/eapol.c:eapol_handle_ptk_1_of_4() ifindex=13 src/netdev.c:netdev_mlme_notify() MLME notification Control Port TX Status(139) src/netdev.c:netdev_unicast_notify() Unicast notification Control Port Frame(129) src/netdev.c:netdev_control_port_frame_event() src/eapol.c:eapol_handle_ptk_3_of_4() ifindex=13 src/netdev.c:netdev_set_gtk() 13 src/station.c:station_handshake_event() Setting keys src/netdev.c:netdev_set_tk() 13 src/netdev.c:netdev_set_rekey_offload() 13 src/netdev.c:netdev_mlme_notify() MLME notification Control Port TX Status(139) src/netdev.c:netdev_mlme_notify() MLME notification Notify CQM(64) src/station.c:station_connect_cb() 13, result: 0 src/station.c:station_connect_ok() src/wiphy.c:wiphy_radio_work_done() Work item 2 done src/netdev.c:netdev_link_notify() event 16 on ifindex 13 src/netconfig.c:netconfig_ifaddr_ipv6_added() ifindex 13: ifaddr fe80::1a5e:fff:fe82:bdec/64 Segmentation fault ***** And here's syslog: Nov 9 19:55:07 lila kernel: [ 952.596320] wlan0: authenticated Nov 9 19:55:07 lila kernel: [ 952.597667] wlan0: associate with xx:xx:xx:xx:xx:xx (try 1/3) Nov 9 19:55:07 lila kernel: [ 952.601524] wlan0: RX AssocResp from xx:xx:xx:xx:xx:xx (capab=0x11 status=0 aid=1) Nov 9 19:55:07 lila kernel: [ 952.603444] wlan0: associated Nov 9 19:55:07 lila kernel: [ 952.655558] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready Nov 9 19:55:08 lila avahi-daemon[771]: Joining mDNS multicast group on interface wlan0.IPv6 with address fe80::1a5e:fff:fe82:bdec. Nov 9 19:55:08 lila avahi-daemon[771]: New relevant interface wlan0.IPv6 for mDNS. Nov 9 19:55:08 lila avahi-daemon[771]: Registering new address record for fe80::1a5e:fff:fe82:bdec on wlan0.*. Nov 9 19:55:08 lila kernel: [ 953.801798] iwd[3276]: segfault at 0 ip 00007f3da1e5a231 sp 00007ffdbcbf18c8 error 4 in libc-2.32.so[7f3da1d21000+149000] Nov 9 19:55:08 lila kernel: [ 953.801833] Code: 84 00 00 00 00 00 0f 1f 00 31 c0 c5 f8 77 c3 66 2e 0f 1f 84 00 00 00 00 00 89 f9 48 89 fa c5 f9 ef c0 83 e1 3f 83 f9 20 77 1f <c5> fd 74 0f c5 fd d7 c1 85 c0 0f 85 df 00 00 00 48 83 c7 20 83 e1 Nov 9 19:55:08 lila kernel: [ 953.841933] wlan0: deauthenticating from xx:xx:xx:xx:xx:xx by local choice (Reason: 3=DEAUTH_LEAVING) Nov 9 19:55:08 lila avahi-daemon[771]: Interface wlan0.IPv6 no longer relevant for mDNS. Nov 9 19:55:08 lila avahi-daemon[771]: Leaving mDNS multicast group on interface wlan0.IPv6 with address fe80::1a5e:fff:fe82:bdec. Nov 9 19:55:08 lila avahi-daemon[771]: Withdrawing address record for fe80::1a5e:fff:fe82:bdec on wlan0. Tmore1 <tmore1(a)gmx.com&gt;