Comments (28)
fhunleth
commented on June 5, 2024
1
Update: Since we switched away from using IPv4 link-local addressing on USB gadget Ethernet with the official Nerves systems, mDNS has been work very well. If anyone else runs into this and is running Nerves, definitely verify that you're not using link-local addresses on the connection.
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fhunleth
commented on June 5, 2024
@mobileoverlord @tmecklem Do either you have anything to add? I'm trying to capture the conversation on July 12th regarding this issue since others are seeing it as well.
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tmecklem
commented on June 5, 2024
That captures it pretty well. I'm willing to do more investigation or capture logs if needed. I'm working with this (and experiencing it) quite a bit now.
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fhunleth
commented on June 5, 2024
Believe it or not, I'm not sure that I'm seeing it on Linux. Either that or I'm getting really lucky.
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entone
commented on June 5, 2024
I'm wondering if you guys can capture the IP address of the node when it's not working and when it is working. There's a TTL setting for the IP registration, I'm wondering if there may be a cache issue from previous deployment attempts.
I'm on Linux as well and will start investigating. The "one" test for the mDNS library "should" fail if this was an issue, but that does run locally, so maybe certain routers are at fault.
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entone
commented on June 5, 2024
@tmecklem could you run the mix test in you local dev environment?
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entone
commented on June 5, 2024
I've updated the tests to be a bit more thorough
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tmecklem
commented on June 5, 2024
System Software Overview:
System Version: macOS 10.12.5 (16F73)
Kernel Version: Darwin 16.6.0
Boot Volume: Macintosh HD
Boot Mode: Normal
Computer Name: xxxxxx
User Name: xxxxxx
Secure Virtual Memory: Enabled
System Integrity Protection: Enabled
Time since boot: 1 day 5:18
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro11,2
Processor Name: Intel Core i7
Processor Speed: 2 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 8 GB
Boot ROM Version: MBP112.0138.B25
SMC Version (system): 2.18f15
13:01 $ mix test
warning: variable "address" is unused
test/mdns_test.exs:45
warning: variable "char_host" is unused
test/mdns_test.exs:45
warning: variable "address" is unused
test/mdns_test.exs:56
13:01:03.622 [debug] Testing Server
13:01:03.625 [debug] [flags: [:up, :loopback, :running, :multicast], addr: {127, 0, 0, 1}, netmask: {255, 0, 0, 0}, addr: {0, 0, 0, 0, 0, 0, 0, 1}, netmask: {65535, 65535, 65535, 65535, 65535, 65535, 65535, 65535}, addr: {65152, 0, 0, 0, 0, 0, 0, 1}, netmask: {65535, 65535, 65535, 65535, 0, 0, 0, 0}]
13:01:03.626 [debug] [flags: [:pointtopoint, :multicast]]
13:01:03.626 [debug] [flags: []]
13:01:03.626 [debug] [flags: [:up, :broadcast, :running, :multicast], hwaddr: [120, 49, 193, 198, 55, 92], addr: {65152, 0, 0, 0, 7295, 44286, 11481, 20117}, netmask: {65535, 65535, 65535, 65535, 0, 0, 0, 0}, addr: {10, 20, 30, 37}, netmask: {255, 255, 255, 0}, broadaddr: {10, 20, 30, 255}]
13:01:03.626 [debug] {65152, 0, 0, 0, 7295, 44286, 11481, 20117}
13:01:03.648 [debug] Address: {65152, 0, 0, 0, 7295, 44286, 11481, 20117}
13:01:03.648 [debug] Hostname: usVTVKQYsw.local
1) test client and server (MdnsTest)
test/mdns_test.exs:26
** (exit) exited in: GenServer.call(Mdns.Server, {:start, []}, 5000)
** (EXIT) an exception was raised:
** (MatchError) no match of right hand side value: {:error, :eaddrinuse}
(mdns) lib/mdns/server.ex:66: Mdns.Server.handle_call/3
(stdlib) gen_server.erl:636: :gen_server.try_handle_call/4
(stdlib) gen_server.erl:665: :gen_server.handle_msg/6
(stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
stacktrace:
(elixir) lib/gen_server.ex:737: GenServer.call/3
test/mdns_test.exs:33: (test)
Finished in 0.09 seconds
1 test, 1 failure
Randomized with seed 556480
13:01:03.668 [error] GenServer Mdns.Server terminating
** (MatchError) no match of right hand side value: {:error, :eaddrinuse}
(mdns) lib/mdns/server.ex:66: Mdns.Server.handle_call/3
(stdlib) gen_server.erl:636: :gen_server.try_handle_call/4
(stdlib) gen_server.erl:665: :gen_server.handle_msg/6
(stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message (from #PID<0.166.0>): {:start, []}
State: %Mdns.Server.State{ip: {0, 0, 0, 0}, services: [], udp: nil}
Client #PID<0.166.0> is alive
(stdlib) gen.erl:169: :gen.do_call/4
(elixir) lib/gen_server.ex:734: GenServer.call/3
test/mdns_test.exs:33: MdnsTest."test client and server"/1
(ex_unit) lib/ex_unit/runner.ex:302: ExUnit.Runner.exec_test/1
(stdlib) timer.erl:166: :timer.tc/1
(ex_unit) lib/ex_unit/runner.ex:250: anonymous fn/3 in ExUnit.Runner.spawn_test/3
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entone
commented on June 5, 2024
Ok, to run mDNS locally on OSX you need to kill the default mDNS server running locally.
In OS X, you can disable it by opening terminal and typing the following:
launchctl unload /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
launchctl unload /System/Library/LaunchDaemons/com.apple.mDNSResponderHelper.plist
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entone
commented on June 5, 2024
The test will probably still not work, as the address function is returning your ipv6 address, and I specifically look for the ipv4. Will try to fix.
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entone
commented on June 5, 2024
Address function in the test is updated to return ipv4 addresses
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aadavids
commented on June 5, 2024
I'm one of the others seeing something similar, except I haven't been able to contact the device at all. This in Linux (Ubuntu 16.10). Here's my mix test output in my dev env:
$ mix test
warning: variable "address" is unused
test/mdns_test.exs:46
warning: variable "char_host" is unused
test/mdns_test.exs:46
warning: variable "address" is unused
test/mdns_test.exs:57
15:40:02.072 [debug] Testing Server
15:40:02.073 [debug] [flags: [:up, :loopback, :running], hwaddr: [0, 0, 0, 0, 0, 0], addr: {127, 0, 0, 1}, netmask: {255, 0, 0, 0}, addr: {0, 0, 0, 0, 0, 0, 0, 1}, netmask: {65535, 65535, 65535, 65535, 65535, 65535, 65535, 65535}]
15:40:02.073 [debug] [flags: [:up, :broadcast, :running, :multicast], hwaddr: [68, 28, 168, 228, 46, 205], addr: {10, 0, 1, 143}, netmask: {255, 255, 255, 0}, broadaddr: {10, 0, 1, 255}, addr: {65152, 0, 0, 0, 60569, 35875, 46618, 58212}, netmask: {65535, 65535, 65535, 65535, 0, 0, 0, 0}]
15:40:02.073 [debug] {10, 0, 1, 143}
15:40:02.084 [debug] Address: {10, 0, 1, 143}
15:40:02.084 [debug] Hostname: dcFIOwMwed.local
15:40:02.089 [debug] {:error, :nxdomain}
1) test client and server (MdnsTest)
test/mdns_test.exs:27
match (=) failed
code: {:ok, {:hostent, char_host, [], :inet, 4, [address]}} = lookup
right: {:error, :nxdomain}
stacktrace:
test/mdns_test.exs:46: (test)
Finished in 0.06 seconds
1 test, 1 failure
Randomized with seed 21530
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entone
commented on June 5, 2024
Odd that a hostname lookup would fail in .005 seconds. The mDNS server doesn't even log the event on my test for .1 seconds.
15:29:53.363 [debug] Testing Server
15:29:53.364 [debug] [flags: [:up, :loopback, :running], hwaddr: [0, 0, 0, 0, 0, 0], addr: {127, 0, 0, 1}, netmask: {255, 0, 0, 0}, addr: {0, 0, 0, 0, 0, 0, 0, 1}, netmask: {65535, 65535, 65535, 65535, 65535, 65535, 65535, 65535}]
15:29:53.364 [debug] [flags: [:up, :broadcast, :running, :multicast], hwaddr: [128, 250, 91, 28, 72, 194]]
15:29:53.364 [debug] [flags: [:up, :broadcast, :running, :multicast], hwaddr: [172, 253, 206, 104, 164, 192], addr: {192, 168, 1, 112}, netmask: {255, 255, 255, 0}, broadaddr: {192, 168, 1, 255}, addr: {65152, 0, 0, 0, 58013, 57918, 36336, 23701}, netmask: {65535, 65535, 65535, 65535, 0, 0, 0, 0}]
15:29:53.364 [debug] {192, 168, 1, 112}
15:29:53.375 [debug] Address: {192, 168, 1, 112}
15:29:53.375 [debug] Hostname: dg5DoV1zN1.local
15:29:53.481 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: 'dg5DoV1zN1.local', type: :a}]}
15:29:53.482 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: 'dg5DoV1zN1.local', type: :a}]}
15:29:53.482 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: 'dg5DoV1zN1.local', type: :a}]}
15:29:53.482 [debug] {:ok, {:hostent, 'dg5DoV1zN1.local', [], :inet, 4, [{192, 168, 1, 112}]}}
15:29:53.482 [debug] Testing Client
15:29:53.482 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: 'dg5DoV1zN1.local', type: :a}]}
15:29:53.482 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: 'dg5DoV1zN1.local', type: :a}]}
15:29:53.483 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: 'dg5DoV1zN1.local', type: :a}]}
15:29:53.483 [debug] Got Response: %DNS.Record{anlist: [%DNS.Resource{bm: [], class: :in, cnt: 0, data: {192, 168, 1, 112}, domain: 'dg5DoV1zN1.local', func: false, tm: :undefined, ttl: 10, type: :a}], arlist: [], header: %DNS.Header{aa: true, id: 0, opcode: :query, pr: false, qr: true, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: []}
15:29:53.483 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: '_nerves._tcp.local', type: :ptr}]}
15:29:53.483 [debug] Got Response: %DNS.Record{anlist: [%DNS.Resource{bm: [], class: :in, cnt: 0, data: {192, 168, 1, 112}, domain: 'dg5DoV1zN1.local', func: false, tm: :undefined, ttl: 10, type: :a}], arlist: [], header: %DNS.Header{aa: true, id: 0, opcode: :query, pr: false, qr: true, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: []}
15:29:53.483 [debug] Got Response: %DNS.Record{anlist: [%DNS.Resource{bm: [], class: :in, cnt: 0, data: '_rosetta._tcp.local', domain: '_nerves._tcp.local', func: false, tm: :undefined, ttl: 10, type: :ptr}], arlist: [], header: %DNS.Header{aa: true, id: 0, opcode: :query, pr: false, qr: true, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: []}
.
15:29:53.483 [debug] Device: {:"_nerves._tcp.local", %Mdns.Client.Device{domain: nil, ip: {192, 168, 1, 112}, payload: %{}, services: ["_rosetta._tcp.local", "_nerves._tcp.local"]}}
from mdns.
entone
commented on June 5, 2024
Can you modify your test to not include the .local in the host name? and report back
from mdns.
entone
commented on June 5, 2024
There's also this bug for 16.10, https://askubuntu.com/questions/837982/how-to-configure-local-dns-lookup-in-ubuntu-16-10#838395
Oh mDNS, the ugly duckling of the network world, so much promise...
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aadavids
commented on June 5, 2024
Yes, I was wondering if it was an issue with my environment. Here's the modified test:
$ mix test
warning: variable "address" is unused
test/mdns_test.exs:46
warning: variable "char_host" is unused
test/mdns_test.exs:46
warning: variable "address" is unused
test/mdns_test.exs:57
16:41:33.399 [debug] Testing Server
16:41:33.401 [debug] [flags: [:up, :loopback, :running], hwaddr: [0, 0, 0, 0, 0, 0], addr: {127, 0, 0, 1}, netmask: {255, 0, 0, 0}, addr: {0, 0, 0, 0, 0, 0, 0, 1}, netmask: {65535, 65535, 65535, 65535, 65535, 65535, 65535, 65535}]
16:41:33.401 [debug] [flags: [:up, :broadcast, :running, :multicast], hwaddr: [68, 28, 168, 228, 46, 205], addr: {10, 0, 1, 143}, netmask: {255, 255, 255, 0}, broadaddr: {10, 0, 1, 255}, addr: {65152, 0, 0, 0, 60569, 35875, 46618, 58212}, netmask: {65535, 65535, 65535, 65535, 0, 0, 0, 0}]
16:41:33.401 [debug] {10, 0, 1, 143}
16:41:33.410 [debug] Address: {10, 0, 1, 143}
16:41:33.410 [debug] Hostname: SnzOJR7UJG
16:41:34.344 [debug] {:error, :nxdomain}
1) test client and server (MdnsTest)
test/mdns_test.exs:27
match (=) failed
code: {:ok, {:hostent, char_host, [], :inet, 4, [address]}} = lookup
right: {:error, :nxdomain}
stacktrace:
test/mdns_test.exs:46: (test)
Finished in 0.9 seconds
1 test, 1 failure
Randomized with seed 350735
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entone
commented on June 5, 2024
Ok, same issue. Are you able to ping any other local machines on your network?
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aadavids
commented on June 5, 2024
Update: I tried reinstalling libnss-resolve (sudo apt purge libnss-resolve and sudo apt install libnss-resolve), and now the unmodified tests pass.
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aadavids
commented on June 5, 2024
$ mix test
warning: variable "address" is unused
test/mdns_test.exs:46
warning: variable "char_host" is unused
test/mdns_test.exs:46
warning: variable "address" is unused
test/mdns_test.exs:57
16:47:58.365 [debug] Testing Server
16:47:58.366 [debug] [flags: [:up, :loopback, :running], hwaddr: [0, 0, 0, 0, 0, 0], addr: {127, 0, 0, 1}, netmask: {255, 0, 0, 0}, addr: {0, 0, 0, 0, 0, 0, 0, 1}, netmask: {65535, 65535, 65535, 65535, 65535, 65535, 65535, 65535}]
16:47:58.367 [debug] [flags: [:up, :broadcast, :running, :multicast], hwaddr: [68, 28, 168, 228, 46, 205], addr: {10, 0, 1, 143}, netmask: {255, 255, 255, 0}, broadaddr: {10, 0, 1, 255}, addr: {65152, 0, 0, 0, 60569, 35875, 46618, 58212}, netmask: {65535, 65535, 65535, 65535, 0, 0, 0, 0}]
16:47:58.367 [debug] {10, 0, 1, 143}
16:47:58.376 [debug] Address: {10, 0, 1, 143}
16:47:58.376 [debug] Hostname: QWecd3h2EW.local
16:47:58.497 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: 'QWecd3h2EW.local', type: :a}]}
16:47:58.505 [debug] {:ok, {:hostent, 'QWecd3h2EW.local', [], :inet, 4, [{10, 0, 1, 143}]}}
16:47:58.505 [debug] Testing Client
16:47:58.506 [debug] Got Query: %DNS.Record{anlist: [], arlist: [], header: %DNS.Header{aa: false, id: 0, opcode: :query, pr: false, qr: false, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: [%DNS.Query{class: :in, domain: '_nerves._tcp.local', type: :ptr}]}
16:47:58.507 [debug] Got Response: %DNS.Record{anlist: [%DNS.Resource{bm: [], class: :in, cnt: 0, data: '_rosetta._tcp.local', domain: '_nerves._tcp.local', func: false, tm: :undefined, ttl: 10, type: :ptr}], arlist: [], header: %DNS.Header{aa: true, id: 0, opcode: :query, pr: false, qr: true, ra: false, rcode: 0, rd: false, tc: false}, nslist: [], qdlist: []}
.
16:47:58.507 [debug] Device: {:"_nerves._tcp.local", %Mdns.Client.Device{domain: nil, ip: {10, 0, 1, 143}, payload: %{}, services: ["_rosetta._tcp.local", "_nerves._tcp.local"]}}
Finished in 0.1 seconds
1 test, 0 failures
Randomized with seed 314710
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entone
commented on June 5, 2024
excellent, thank you for testing this. hopefully that resolves your network deployment tests as well.
I always run an LTS version of Ubuntu, for the record.
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aadavids
commented on June 5, 2024
Yeah, sticking with LTS is probably the smarter thing to do :).
Unfortunately still unable to contact the device.
from mdns.
entone
commented on June 5, 2024
can you run ping nerves.local or whatever the hostname is set to for the device.
are you sure the device is on the network?
Is this rpi0w?
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aadavids
commented on June 5, 2024
It's a BeagleBone black, running a port of "gadget mode" from the rpi0. So it's supposed to set up a connection over the USB interface.
I'm unable to ping the BBB from linux. Interestingly, I tried the same device with my mac at home, and it worked. The first ping packet always times out, but after that it's good. So the issue on linux might be unrelated.
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fhunleth
commented on June 5, 2024
@aadavids Hmm... Could you try a couple things on Linux? First, could you check that the virtual Ethernet interface that shows up on Linux is getting assigned a link local IP address? For example, run ifconfig -a in a terminal and look for a 169.254.0.0/16 address . The next thing to try is to run wireshark and capture all of the traffic on the virtual Ethernet interface. Wireshark labels packets, so you should see some mDNS packets go through. Or, maybe this is another Ubuntu 16.10 bug?
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aadavids
commented on June 5, 2024
Sorry, I won't have that much time to test things until Monday, but here's the network config:
enp0s20f0u1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::3d1b:5fa7:7b82:5256 prefixlen 64 scopeid 0x20<link>
ether 1a:52:97:d4:b5:03 txqueuelen 1000 (Ethernet)
RX packets 2 bytes 80 (80.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 45 bytes 6338 (6.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
So it looks like it's getting an ipv6 address?
from mdns.
entone
commented on June 5, 2024
Hmm, if the virtual interface is only getting an ipv6 address, that could be an issue. I haven't tested mDNS with ipv6 and I'm pretty sure the rpi0 firmware only uses ipv4 as well.
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fhunleth
commented on June 5, 2024
I had thought that IPv4 link local addresses would be assigned by default unless they were explicitly disabled. It may be that the system is waiting for DHCP to time out before assigning an address?
Also, regarding rpi0 firmware only using ipv4, that's sadly correct. For some reason I had thought that it just wasn't used. Not that it will change much since applications need to support it, but I'll start moving it into the systems: nerves-project/nerves_system_rpi0#19.
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aadavids
commented on June 5, 2024
I captured some of the traffic on the virtual Ethernet interface and I can see MDNS packets. I also tried to ping the device a couple times while wireshark was running. mdns.pcapng.tar.gz
So then I guess the issue seems to be that the virtual Ethernet interface is getting an ipv6 address?
from mdns.
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