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#1 2016-06-18 16:43:02

johnp636
Member
From: St. Louis, MO, USA
Registered: 2013-12-30
Posts: 21

[Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

I've set up a Raspberry Pi Zero to enable its USB gadget ethernet subsystem.  On my Arch x86_64 desktop machine, I have avahi-daemon.service running.  When I connect the Zero to a USB port, I can see it show up in the output of avahi-browse: 

$ avahi-browse -art 
[...]
+ enp0s26u1u1u3 IPv6 raspberrypi [62:22:a1:e8:3c:a3]               Workstation          local
[...]
= enp0s26u1u1u3 IPv6 raspberrypi [62:22:a1:e8:3c:a3]               Workstation          local
   hostname = [raspberrypi.local]
   address = [fe80::9469:84c0:ec07:4d1e]
   port = [9]
   txt = []

I can successfully ssh into the Zero with this command: 

$ ssh -6 pi@fe80::9469:84c0:ec07:4d1e%enp0s26u1u1u3    # connection is OK with this

I'd like to be able to use the raspberrypi.local hostname, but I can't figure out how to get that to resolve.  I would also like to be able to ssh to raspberrypi.local without having to specify the cryptic enp<something> interface name.  

$ ssh -6 pi@raspberrypi.local
ssh: connect to host raspberrypi.local port 22: Invalid argument

I imagine the problem is that I'm not specifying an interface or route for ssh to raspberrypi.local.  Trying to ping the Zero fails, but it appears my desktop machine (storm) is trying to reach it via the wrong interface, enp7s0.  

$ ping -c 2 -6 -I enp0s26u1u1u3 raspberrypi.local
PING raspberrypi.local(raspberrypi.local (fe80::9469:84c0:ec07:4d1e)) 56 data bytes
From storm.local (fe80::8e89:a5ff:fe32:ea0d%enp7s0) icmp_seq=1 Destination unreachable: Address unreachable
From storm.local (fe80::8e89:a5ff:fe32:ea0d%enp7s0) icmp_seq=2 Destination unreachable: Address unreachable

--- raspberrypi.local ping statistics ---
2 packets transmitted, 0 received, +2 errors, 100% packet loss, time 1007ms

Last edited by johnp636 (2016-06-21 18:37:24)

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#2 2016-06-18 17:19:48

johnp636
Member
From: St. Louis, MO, USA
Registered: 2013-12-30
Posts: 21

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

Here are the messages from avahi-daemon.service and avahi-dnsconfd.service.  

# journalctl -b -u avahi-daemon
-- Logs begin at Sat 2014-04-19 10:51:38 CDT, end at Sat 2016-06-18 12:15:11 CDT. --
Jun 18 12:13:46 storm systemd[1]: Starting Avahi mDNS/DNS-SD Stack...
Jun 18 12:13:46 storm avahi-daemon[1344]: Found user 'avahi' (UID 84) and group 'avahi' (GID 84).
Jun 18 12:13:46 storm avahi-daemon[1344]: Successfully dropped root privileges.
Jun 18 12:13:46 storm avahi-daemon[1344]: avahi-daemon 0.6.32 starting up.
Jun 18 12:13:46 storm systemd[1]: Started Avahi mDNS/DNS-SD Stack.
Jun 18 12:13:46 storm avahi-daemon[1344]: Successfully called chroot().
Jun 18 12:13:46 storm avahi-daemon[1344]: Successfully dropped remaining capabilities.
Jun 18 12:13:46 storm avahi-daemon[1344]: No service file found in /etc/avahi/services.
Jun 18 12:13:46 storm avahi-daemon[1344]: Joining mDNS multicast group on interface enp7s0.IPv6 with address fe80::8e89:a5ff:fe32:ea
Jun 18 12:13:46 storm avahi-daemon[1344]: New relevant interface enp7s0.IPv6 for mDNS.
Jun 18 12:13:46 storm avahi-daemon[1344]: Joining mDNS multicast group on interface enp7s0.IPv4 with address 192.168.1.101.
Jun 18 12:13:46 storm avahi-daemon[1344]: New relevant interface enp7s0.IPv4 for mDNS.
Jun 18 12:13:46 storm avahi-daemon[1344]: Network interface enumeration completed.
Jun 18 12:13:46 storm avahi-daemon[1344]: Registering new address record for fe80::8e89:a5ff:fe32:ea0d on enp7s0.*.
Jun 18 12:13:46 storm avahi-daemon[1344]: Registering new address record for 192.168.1.101 on enp7s0.IPv4.
Jun 18 12:13:47 storm avahi-daemon[1344]: Server startup complete. Host name is storm.local. Local service cookie is 785245565.
Jun 18 12:14:26 storm avahi-daemon[1344]: Joining mDNS multicast group on interface enp0s26u1u1u3i1.IPv6 with address fe80::4c02:9ff
Jun 18 12:14:26 storm avahi-daemon[1344]: New relevant interface enp0s26u1u1u3i1.IPv6 for mDNS.
Jun 18 12:14:26 storm avahi-daemon[1344]: Registering new address record for fe80::4c02:9fff:fe82:dc86 on enp0s26u1u1u3i1.*.

# journalctl -b -u avahi-dnsconfd
-- Logs begin at Sat 2014-04-19 10:51:38 CDT, end at Sat 2016-06-18 12:18:25 CDT. --
Jun 18 12:18:25 storm systemd[1]: Stopped Avahi DNS Configuration Daemon.
Jun 18 12:18:25 storm systemd[1]: Started Avahi DNS Configuration Daemon.
Jun 18 12:18:25 storm avahi-dnsconfd[2023]: Successfully connected to Avahi daemon.

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#3 2016-06-19 00:34:15

johnp636
Member
From: St. Louis, MO, USA
Registered: 2013-12-30
Posts: 21

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

In case it helps to explain what's going on, here is what I see on the Zero. 

pi@raspberrypi:~ $ ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: usb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 5e:6c:a5:ba:79:70 brd ff:ff:ff:ff:ff:ff
    inet 169.254.31.48/16 brd 169.254.255.255 scope global usb0
       valid_lft forever preferred_lft forever
    inet6 fe80::4e4d:42e0:7573:d93c/64 scope link 
       valid_lft forever preferred_lft forever

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#4 2016-06-19 03:45:26

x33a
Forum Fellow
Registered: 2009-08-15
Posts: 4,587

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

Show the output of

ip route

on both the machines.

and the output of

ip addr

on the desktop.

Mod note: Unless someone replies to your post, it is advisable to edit your existing post and keep adding newer information to that post itself.

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#5 2016-06-19 12:16:40

johnp636
Member
From: St. Louis, MO, USA
Registered: 2013-12-30
Posts: 21

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

Sorry about the serial posting. 

By the way, there was a reboot since my last post, so the address of the Pi has changed. 

On the desktop:

[root@storm ~]# ip route
default via 192.168.1.1 dev enp7s0  proto dhcp  src 192.168.1.101  metric 10 
192.168.1.0/24 dev enp7s0  proto kernel  scope link  src 192.168.1.101 
192.168.1.1 dev enp7s0  proto dhcp  scope link  src 192.168.1.101  metric 10 
[root@storm ~]# ip -6 route
fe80::/64 dev enp7s0  proto kernel  metric 256  pref medium
fe80::/64 dev enp0s26u1u1u3i1  proto kernel  metric 256  pref medium
default via fe80::224:a5ff:fed9:2c29 dev enp7s0  proto ra  metric 1024  pref medium
[root@storm ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 8c:89:a5:32:ea:0d brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.101/24 brd 192.168.1.255 scope global dynamic enp7s0
       valid_lft 43066sec preferred_lft 43066sec
    inet6 fe80::8e89:a5ff:fe32:ea0d/64 scope link 
       valid_lft forever preferred_lft forever
3: enp0s26u1u1u3i1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
    link/ether 4e:02:9f:82:dc:86 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::4c02:9fff:fe82:dc86/64 scope link 
       valid_lft forever preferred_lft forever

Also on the desktop: 

$ avahi-browse -art
+ enp0s26u1u1u3i1 IPv6 raspberrypi [ce:a6:f7:d5:a6:2e]               Workstation          local
[...]
= enp0s26u1u1u3i1 IPv6 raspberrypi [ce:a6:f7:d5:a6:2e]               Workstation          local
   hostname = [raspberrypi.local]
   address = [fe80::8d2f:967a:ebc8:7972]
   port = [9]
   txt = []

On the Pi Zero:

pi@raspberrypi:~ $ ip route
169.254.0.0/16 dev usb0  proto kernel  scope link  src 169.254.31.48  metric 202 
pi@raspberrypi:~ $ ip -6 route
fe80::/64 dev usb0  proto kernel  metric 256 
pi@raspberrypi:~ $ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: usb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether ce:a6:f7:d5:a6:2e brd ff:ff:ff:ff:ff:ff
    inet 169.254.31.48/16 brd 169.254.255.255 scope global usb0
       valid_lft forever preferred_lft forever
    inet6 fe80::8d2f:967a:ebc8:7972/64 scope link 
       valid_lft forever preferred_lft forever

Last edited by johnp636 (2016-06-19 13:54:58)

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#6 2016-06-20 11:11:10

x33a
Forum Fellow
Registered: 2009-08-15
Posts: 4,587

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

So, the Pi only has a link local address? Try giving a 192 series IP to the pi and ping it from the desktop.

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#7 2016-06-21 02:26:43

johnp636
Member
From: St. Louis, MO, USA
Registered: 2013-12-30
Posts: 21

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

Giving the Pi another IP address defeats the purpose of this exercise, that is, finding it via Avahi name lookup.  I've made some progress, however.  I can tell ssh which of the desktop interfaces to use, and then it finds the Pi.  

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 8c:89:a5:32:ea:0d brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.101/24 brd 192.168.1.255 scope global dynamic enp7s0
       valid_lft 38107sec preferred_lft 38107sec
    inet6 fe80::8e89:a5ff:fe32:ea0d/64 scope link 
       valid_lft forever preferred_lft forever
3: enp0s26u1u1u3i1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
    link/ether 4e:02:9f:82:dc:86 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::4c02:9fff:fe82:dc86/64 scope link 
       valid_lft forever preferred_lft forever
$ # use the desktop's link-locak IPv6 address for the USB gadget ethernet interface
$ ssh -6 -o BindAddress=fe80::4c02:9fff:fe82:dc86%enp0s26u1u1u3i1 pi@raspberrypi.local  # succeeds

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#8 2016-06-21 03:37:08

x33a
Forum Fellow
Registered: 2009-08-15
Posts: 4,587

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

johnp636 wrote:

Giving the Pi another IP address defeats the purpose of this exercise, that is, finding it via Avahi name lookup.  I've made some progress, however.  I can tell ssh which of the desktop interfaces to use, and then it finds the Pi.

Ah, nevermind. I somehow missed out that you wanted to only use Avahi. Glad that you could find a solution.

PS: If you are satisfied with your solution, then please mark the thread as solved.

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#9 2016-06-21 18:56:01

johnp636
Member
From: St. Louis, MO, USA
Registered: 2013-12-30
Posts: 21

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

In case someone would like to try this, I'll add some more information.  To let the Pi Zero get a network connection of its own on my network, I set up a bridge and let systemd-networkd add both my desktop machine's Ethernet NIC and the USB gadget Ethernet NIC to the bridge.  This way, my Pi gets its own IP address on my network from my router via DHCP. 

Finding it as raspberrypi.local still works.  

# cat MyBridge.netdev 
[NetDev]
Name=br0
Kind=bridge
# cat MyBridge.network 
[Match]
Name=br0

[Network]
DHCP=ipv4
# cat 50-dhcp.network 
[Match]
Name=en*

[Network]
Bridge=br0
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 8c:89:a5:32:ea:0d brd ff:ff:ff:ff:ff:ff
    inet6 fe80::8e89:a5ff:fe32:ea0d/64 scope link 
       valid_lft forever preferred_lft forever
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 92:ef:b2:67:5b:17 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.48/24 brd 192.168.1.255 scope global dynamic br0
       valid_lft 42719sec preferred_lft 42719sec
    inet6 fe80::90ef:b2ff:fe67:5b17/64 scope link 
       valid_lft forever preferred_lft forever
5: enp0s26u1u1u3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 1a:0b:ad:f6:16:cf brd ff:ff:ff:ff:ff:ff
    inet6 fe80::180b:adff:fef6:16cf/64 scope link 
       valid_lft forever preferred_lft forever
$ ssh pi@raspberrypi.local
[...]
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: usb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether e6:41:f4:3c:9a:2a brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.49/24 brd 192.168.1.255 scope global usb0
       valid_lft forever preferred_lft forever
    inet6 fe80::3beb:a16b:cbe2:2616/64 scope link 
       valid_lft forever preferred_lft forever

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#10 2016-09-13 05:29:15

lilorox
Member
Registered: 2011-10-16
Posts: 25

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

Sorry to dig up this solved post but did you finally manage to use avahi?

Did you try to use nss-mdns as stated on avahi's wiki page?

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#11 2016-09-17 20:23:51

johnp636
Member
From: St. Louis, MO, USA
Registered: 2013-12-30
Posts: 21

Re: [Solved] Connecting to Raspberry Pi Zero using USB ethernet and Avahi

lilorox wrote:

Sorry to dig up this solved post but did you finally manage to use avahi?

Did you try to use nss-mdns as stated on avahi's wiki page?

After taking the approach of letting the Pi Zero on my home network by bridging, I didn't try again to get nss-mdns to work.  Finding the Pi Zero using its IPv6 link-local address seemed to work, though.

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