simplified border router setup #4725

kaspar030 · 2016-01-31T16:21:27Z

I've been trying to automate border router setup.

edit check discussion for up-to-date instructions

OlegHahm · 2016-01-31T17:13:22Z

(seems to work if the global adress of the target node happens to be in the neighbor cache, if not, sometimes the lookup doesn't work, don't know exactly why)

This is strange. Normally, no lookup should be necessary for a direct neighbor in 6lo.

OlegHahm · 2016-01-31T17:14:39Z

ping between Linux and 6lbr 6lo-side

Why do you think this is important?

OlegHahm · 2016-01-31T17:15:30Z

The last two issues may be fixed by #4714

OlegHahm · 2016-01-31T17:17:32Z

Why is radvd required on the serial interface?

kaspar030 · 2016-01-31T17:47:10Z

ping between Linux and 6lbr 6lo-side

Why do you think this is important?
Because if I decide to use link-local addresses for routing because of simplicity, the 6lo configured address might be the only globally reachable one.
Also, because I would just expect a node to reply if all routing is set up correctly.

kaspar030 · 2016-01-31T17:48:14Z

Why is radvd required on the serial interface?

It is not needed, it was just there. I didn't want to hack prefix setup using induced shell commands or special handling within ethos. edit this is a kludge, as I said, we need to come up with something better, but the kludge is only 5 lines of code, so it's easily replacable.

kaspar030 · 2016-01-31T18:31:56Z

BTW, setting "START_RADVD" to anything else but "true" disables any hackery regarding prefixes. A prefix must be configured manually in that case.

kYc0o · 2016-02-01T12:09:22Z

I completely agree with this PR. I discussed some days ago with Cenk even the need of a shell on a 6lbr. I think that it could be very useful for debugging purposes or fine configs. Otherwise I think a SLIP interface preconfigured with a prefix should do the job an initialize the network automatically (ok this is not magic but I don't think the scenario is impossible) without a shell.
I'll test your scripts and give feedback.

OlegHahm · 2016-02-04T17:12:11Z

dist/tools/ethos/ethos.c

+static void _clear_neighbor_cache(const char *ifname)
+{
+    char tmp[20 + IFNAMSIZ];
+    snprintf(tmp, sizeof(tmp), "ip neigh flush dev %s", ifname);


Does this work for you?

If I have an entry with status FAILED it stays there even after the flushing.

Works for me, but it needs ethos to be called with root right / sudo, did you do that?

I did:

--> sudo ip a a beef::1/64 dev tap0 --> ping6 beef::2 PING beef::2(beef::2) 56 data bytes ^C --- beef::2 ping statistics --- 1 packets transmitted, 0 received, 100% packet loss, time 0ms --> ip n ... beef::2 dev tap0 FAILED ... --> sudo ip n flush dev tap0 --> ip n ... beef::2 dev tap0 FAILED ...

the flush flushes positive cache entries.
You can see the effect of the flush call when you

startup ethos

ping from linux

while linux is pinging, type "reboot" at ethos shell

The linux ping should continue seamlessly with that flush call enabled, if you comment it out, the linux ping stops after RIOT's reboot as RIOT's MAC address has changed.

Hm, okay. Do you know any way to wipe out "FAILED" entries? Because this is really annoying if you setup your tap interface and Linux decides to consider the prefix as on-link and then marks any 6lo node (except the 6LBR) as an unreachable neighbor.

iseitani · 2016-02-05T17:06:50Z

Dear all, I want to fix the Linux-6lo node connectivity issue ,is it possible to provide me some instructions?Thank you in advance!

OlegHahm · 2016-02-06T12:16:04Z

@kaspar030, if the purpose of this PR is to automate everything, you should consider to add an arbitrary non-link-local address to a Linux network interface.

OlegHahm · 2016-02-06T12:16:59Z

@iseitani

I want to fix the Linux-6lo node connectivity issue

Can you describe step-by-step which commands you executed and what is not working?

kaspar030 · 2016-02-06T12:32:36Z

@kaspar030, if the purpose of this PR is to automate everything, you should consider to add an arbitrary non-link-local address to a Linux network interface.

will do.

OlegHahm · 2016-02-06T12:41:11Z

Maybe this is a case for ULA.

kaspar030 · 2016-02-06T13:56:42Z

Maybe this is a case for ULA.

Good idea!

iseitani · 2016-02-06T17:21:05Z

Dear @OlegHahm ,

sudo sh start_network.sh /dev/ttyACM0 tap0 affe::/64 (copy-paste from[+])
ifconfig 5 add affe::5840:2276:95d0:f32e (BR's if)
ncache add 5 affe::5840:2478:8532:262a (Node's if)
plug the Node
5)export BOARD=samr21-xpro SERIAL='ATML2127031800003936' && make term

I tried both with and without step 3.
Steps 2 and 3 were validated with the output of ifconfig command in both R21 boards.
Moreover I used in both BR and Riot Node fibroute .
There is a record for affe:: with metric 1024 in my Linux rtable

I can ping from BR to the Node, the opposite is only successful when I ping the
IF that uses 802.15.4 .

What I want : How can the echo message start from the
node , get routed to the correct IF in BR and
get to the Linux.
Thank you!

[+] #4725

kaspar030 · 2016-02-07T15:01:41Z

rebased
added ULA creation
added UHCP (micro host control protocol) prototype implementation
adapted gnrc_border_router & scripts

Tested with two samr21-xpro's.

To try:

"make" in dist/tools/uhcpd and dist/tools/ethos
compile & flash gnrc_border_router
"sudo sh start_network.sh /dev/ACMx tap0 2001:db8::/64" edit (in dist/tools/ethos)

Now the 6lbr should answer pings on fe80::2%tap0, and it should announce 2001:db8::/64 to the wireless interface.

TODO edit (IMHO to be done in the next iteration, this is functional enough for gnrc_border_router):

conn_udp needs timeouts and a way to get/specify the interface used for multicast & link-local
uhcpd needs to save it's state, support more than one client, automatically set up routes, watch it's interface, ...
UHCP protocol is just one day old, a lot is missing (e.g., lifetimes, documentation...)

edit

get rid of fe80::1/2 and use UCHP server/client link local addresses

known issues (edit: unrelated to this PR):

RIOT doesn't reply correctly to it's own address from prefix unless pinged from 6lo
it seems like neighbor caching on RIOT is flakey. sometimes a reboot of 6lbr is necessary to ping fe80::2 from Linux, and sometimes 6lr needs to be rebooted in order to be able to ping it from Linux.

edit fixed prefix in start_network.sh ...

kaspar030 · 2016-02-07T18:05:52Z

Forgot to mention: if started correctly, one command is enough now to set up global connectivity for the 6lowpan network.

emmanuelsearch · 2016-02-08T09:38:25Z

So what is still WIP and what is not WIP anymore in this PR?
Can it be broken in several PRs or can additional functionalities be added later?

kYc0o · 2016-04-11T14:18:43Z

sys/net/gnrc/application_layer/uhcpc/gnrc_uhcpc.c

+        }
+    }
+
+    LOG_INFO("uhcpc: Using %u as border interface and %u as wireless interface.\n", gnrc_border_interface, gnrc_wireless_interface);


Can the LOG_INFO be set for gnrc_uhcpc instead? here and in the other logs. This helps to make the difference between this and uhcpc (I got confused while debugging)

aabadie · 2016-04-11T14:34:27Z

I rebased this branch on #5289 and I confirm that it's working now.
From a node running gnrc_networking example behind the BR, I can ping the Linux host on fd00::dead:beef::1.

kaspar030 · 2016-04-11T15:04:54Z

rebased
addressed comments

Using "NETOPT_IS_WIRED" flag now (good idea!), fixed gnrc_uhcpc log prefixes.

kYc0o · 2016-04-12T15:15:15Z

Last test works like a charm. Ping between nodes and BR works OK for the first ~15min, afterwards only the BR deleted the entries of the other nodes on the neighbour cache. After ~25min nodes can still be pinged between each other. So, I ACK this PR and independently of ND problems I think this should be merged. Any comments against that? @kaspar030 @authmillenon @OlegHahm @cgundogan

OlegHahm · 2016-04-12T15:23:47Z

Sounds fair to me.

aabadie · 2016-04-12T15:30:10Z

Just to let you know that I tested it yesterday with one of @haukepetersen's demo (node_imu).
Basically it generates a "lot" of traffic on the serial link as it sends CoAP messages every 50ms and after some time (a few seconds), ethos "disconnect" but it can recover. If one uses with another node behind the BR, ethos couldn't recover and I had to manually unplug/plug the BR usb link.
Appart from that, it's working well.

haukepetersen · 2016-04-12T15:39:00Z

I have the same opinion: let's merge this PR for now and look at the open issues for this in follow-ups, so we can finally create the release branch and use that as base for further testing/fixing.

I 2nd @kYc0o's ACK, Murdock (and even Travis) is green -> let's go

kaspar030 · 2016-04-12T16:30:57Z

nice!

emmanuelsearch · 2016-04-12T18:53:18Z

+1

miri64 · 2016-04-13T14:52:39Z

+1

kaspar030 added Area: network Area: Networking State: WIP State: The PR is still work-in-progress and its code is not in its final presentable form yet Discussion: RFC The issue/PR is used as a discussion starting point about the item of the issue/PR labels Jan 31, 2016

OlegHahm reviewed Feb 4, 2016
View reviewed changes

kaspar030 force-pushed the ethos_br_hack branch 2 times, most recently from 8c90e8b to e74e42a Compare February 5, 2016 18:46

kaspar030 force-pushed the ethos_br_hack branch 2 times, most recently from 23b18ec to 9abfb43 Compare February 7, 2016 14:53

kaspar030 added this to the Release 2016.03 milestone Feb 7, 2016

kaspar030 force-pushed the ethos_br_hack branch from 9abfb43 to b994769 Compare February 8, 2016 10:03

kaspar030 added CI: needs squashing Commits in this PR need to be squashed; If set, CI systems will mark this PR as unmergable and removed State: WIP State: The PR is still work-in-progress and its code is not in its final presentable form yet labels Feb 8, 2016

kYc0o reviewed Apr 11, 2016
View reviewed changes

kaspar030 added 17 commits April 11, 2016 17:03

sys: net: add UHCP protocol code and gnrc client implementation

4fb07a8

dist: tools: add UHCP daemon

e17045e

dist: ethos: add clean target

2ec71c9

examples: gnrc_border_router: switch to UHCP + ethos

ce16c24

dist: tools: ethos: add start_network.sh

ee37ea9

drivers: ethos: add missing irq.h include

e4a92a6

drivers: ethos: fix static const declarations

2cd2194

drivers: ethos: fix cast of length parameter

d33423b

sys: net: gnrc: uhcpc: fix pedantic errors

376b564

drivers: ethos: make internal function static

2783344

cpu: native: make netdev2_tap internal functions static

3344815

sys: net: gnrc: uhcpc: only start if multiple interfaces found

228d642

drivers: ethos: add missing tsrb dependency

7c9703b

examples: gnrc_border_router: clean up ethos configuration

0725d3e

sys: net: gnrc: uhcp: consider non-ethernet device as wireless

8f2e1d2

dist: ethos: fix start_network.sh trap (exit on INT QUIT TERM EXIT)

eea62a7

sys: net: gnrc_uhcpc: use IS_WIRED for border interface, fix log prefix

edb5f08

kaspar030 force-pushed the ethos_br_hack branch from 4455407 to edb5f08 Compare April 11, 2016 15:03

haukepetersen merged commit 5fe57b4 into RIOT-OS:master Apr 12, 2016

kaspar030 deleted the ethos_br_hack branch April 12, 2016 16:30

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simplified border router setup #4725

simplified border router setup #4725

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simplified border router setup #4725

simplified border router setup #4725

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