No internet with netctl-ifpluged albeit internet is connected

cutuchiqueno · 2014-09-23 09:13:55

I bought an external usb ethernet adaptor for my Dell XPS13

It is recognized by the system and I can manually get it up with ip link:

λ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
    link/ether 7c:7a:91:27:73:ba brd ff:ff:ff:ff:ff:ff
3: enp0s20u2u1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether 00:23:55:8c:31:60 brd ff:ff:ff:ff:ff:ff

At this point I don't have an IP for the interface. Since I want to use it with netctl-ifpluged I copied the example netctl config file and changed the interface name:

λ cat /etc/netctl/enp0s20u2u1-dhcp
Description='A basic dhcp ethernet connection'
Interface=enp0s20u2u1
Connection=ethernet
IP=dhcp

I than modified ipfluged.conf to handle the interface:

λ cat /etc/ifplugd/ifplugd.conf
# Specify the interfaces to control here, separated by spaces.
# Ifplugd processes will be started for each of these interfaces when
# the ifplugd init script is called with the "start" argument. You may
# use the magic string "auto" to make the init script start or stop
# ifplugd processes for ALL eth and wlan interfaces that are available
# according to /proc/net/dev. Note that the list of interfaces
# appearing in /proc/net/dev may depend on which kernel modules you
# have loaded.
INTERFACES="enp0s20u2u1"

# Additional parameters for ifplugd.
# (Run "ifplugd -h" for further information.)
ARGS="-fwI -u0 -d10"

I enabled the systemd service netctl-ifplugd@enp0s20u2u1.service and get the following:

λ systemctl status netctl-ifplugd@enp0s20u2u1.service
● netctl-ifplugd@enp0s20u2u1.service - Automatic wired network connection using netctl profiles
   Loaded: loaded (/usr/lib/systemd/system/netctl-ifplugd@.service; enabled)
   Active: active (running) since Di 2014-09-23 11:01:00 CEST; 3s ago
     Docs: man:netctl.special(7)
 Main PID: 1923 (ifplugd)
   CGroup: /system.slice/system-netctl\x2difplugd.slice/netctl-ifplugd@enp0s20u2u1.service
           ├─1923 /usr/bin/ifplugd -i enp0s20u2u1 -r /etc/ifplugd/netctl.action -bfIns
           ├─1926 /bin/bash /etc/ifplugd/netctl.action enp0s20u2u1 up
           ├─1945 /bin/bash /usr/lib/network/network start enp0s20u2u1-dhcp
           └─1951 dhcpcd -4 -q -t 30 -L enp0s20u2u1

Sep 23 11:01:00 sputnik3arch ifplugd[1923]: client: Reading profile 'wlp2s0-eduroam'
Sep 23 11:01:00 sputnik3arch ifplugd[1923]: client: Reading profile 'wlp2s0-britt'
Sep 23 11:01:00 sputnik3arch ifplugd[1923]: client: Reading profile 'enp0s20u2u1-dhcp'
Sep 23 11:01:00 sputnik3arch ifplugd[1923]: client: Reading profile 'wlp2s0-android'
Sep 23 11:01:00 sputnik3arch ifplugd[1923]: client: Starting network profile 'enp0s20u2u1-dhcp'...
Sep 23 11:01:00 sputnik3arch dhcpcd[1951]: version 6.4.3 starting
Sep 23 11:01:00 sputnik3arch dhcpcd[1951]: DUID 00:01:00:01:1a:aa:00:a7:7c:7a:91:27:73:ba
Sep 23 11:01:00 sputnik3arch dhcpcd[1951]: enp0s20u2u1: IAID 55:8c:31:60
Sep 23 11:01:01 sputnik3arch dhcpcd[1951]: enp0s20u2u1: soliciting a DHCP lease
Sep 23 11:01:02 sputnik3arch dhcpcd[1951]: enp0s20u2u1: offered 194.95.188.196 from 194.95.188.194 `saal.bbaw.de'

at this point I can ping for example Google, some seconds later I can't anymore and the status of ifpluged is

λ systemctl status netctl-ifplugd@enp0s20u2u1.service
● netctl-ifplugd@enp0s20u2u1.service - Automatic wired network connection using netctl profiles
   Loaded: loaded (/usr/lib/systemd/system/netctl-ifplugd@.service; enabled)
   Active: active (running) since Di 2014-09-23 11:01:00 CEST; 1min 53s ago
     Docs: man:netctl.special(7)
 Main PID: 1923 (ifplugd)
   CGroup: /system.slice/system-netctl\x2difplugd.slice/netctl-ifplugd@enp0s20u2u1.service
           ├─1923 /usr/bin/ifplugd -i enp0s20u2u1 -r /etc/ifplugd/netctl.action -bfIns
           └─2040 dhcpcd -4 -q -t 30 -L enp0s20u2u1

Sep 23 11:01:00 sputnik3arch dhcpcd[1951]: DUID 00:01:00:01:1a:aa:00:a7:7c:7a:91:27:73:ba
Sep 23 11:01:00 sputnik3arch dhcpcd[1951]: enp0s20u2u1: IAID 55:8c:31:60
Sep 23 11:01:01 sputnik3arch dhcpcd[1951]: enp0s20u2u1: soliciting a DHCP lease
Sep 23 11:01:02 sputnik3arch dhcpcd[1951]: enp0s20u2u1: offered 194.95.188.196 from 194.95.188.194 `saal.bbaw.de'
Sep 23 11:01:07 sputnik3arch dhcpcd[1951]: enp0s20u2u1: leased 194.95.188.196 for 300 seconds
Sep 23 11:01:07 sputnik3arch dhcpcd[1951]: enp0s20u2u1: adding route to 194.95.188.192/26
Sep 23 11:01:07 sputnik3arch dhcpcd[1951]: enp0s20u2u1: adding default route via 194.95.188.193
Sep 23 11:01:07 sputnik3arch dhcpcd[1951]: forked to background, child pid 2040
Sep 23 11:01:07 sputnik3arch ifplugd[1923]: client: Started network profile 'enp0s20u2u1-dhcp'
Sep 23 11:01:07 sputnik3arch ifplugd[1923]: Program executed successfully.

for some reason netctl-ifpluged starts a second dhcpd process 5 seconds after the first one and from this point I can not ping any external IP anymore. The Wifi interface on the other hand is going up and down all the time.

cfr · 2014-09-27 22:51:56

Not sure but shouldn't things normally NOT fork to the background if handled by systemd? I'm not sure since I don't use dhcpcd any longer (since it started to cause problems).

Have you tried dhclient in place of dhcpcd? I used the latter for ages but switched to dhclient a little bit ago when it started seeming to cause problems. I realise this isn't really an answer...

Do make sure that you have disabled all conflicting network services - whether systemd services or netctl profiles or whatever.

Last edited by cfr (2014-09-27 22:59:33)

Arch Linux

#1 2014-09-23 09:13:55

No internet with netctl-ifpluged albeit internet is connected

#2 2014-09-27 22:51:56

Re: No internet with netctl-ifpluged albeit internet is connected

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