wpa_supplicant and routes

pholthau · Posted: Mon Nov 10, 2008 9:51 pm Post subject: wpa_supplicant and routes

Hi!

I am using wpa_supplicant to authenticate a wired interface (IEEE802.1X).

This is the relevant part in /etc/conf.d/net:

Wormo · Posted: Tue Nov 11, 2008 6:34 am Post subject: Re: wpa_supplicant and routes

pholthau · Posted: Tue Nov 11, 2008 7:49 am Post subject:

Thanks, trying that now. But this is really confusing me. Why should I put these routes to /etc/conf.d/net if they are not used for every dhcpcd refresh? I thought the route_eth0 var can be used for routes that are _not_ provided by the dhcp server.
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Wormo · Posted: Tue Nov 11, 2008 7:22 pm Post subject:

I suspect the problem is that you have link-level static routes -- those are not so common. Typical static routes point to gateways, e.g. "x.x.x.0/24 via x.x.x.y". Your link-level routes seem hard to distinguish from automatically generated routes from discarded ip addresses on the 129. and 212. networks that should be deleted as stale. Perhaps you'd like to bring it up as a feature request to the dhcpcd developer and see what he thinks?

http://roy.marples.name/
http://freshmeat.net/projects/dhcpcd/

UberLord · Posted: Tue Nov 11, 2008 9:09 pm Post subject:

dhcpcd-4 does not go out of its way to delete routes that it does not control.
Unlike dhcpcd-3 which did.

Do this in /etc/dhcpcd.enter-hook AND /etc/dhcpcd.exit-hook

route

Then with the routes you have configured active, do this
pkill -9 dhcpcd
dhcpcd -d ${iface}

pkill -9 is needed so that dhcpcd doesn't tear anything down on exit.
replace $iface with the name of your real interface, or leave it out.
The output should clairfy what dhcpcd does.
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Wormo · Posted: Tue Nov 11, 2008 9:17 pm Post subject:

How's that for service, dhcpcd developer came to you

sounds like you have a good reason to move to dhcpcd-4

UberLord · Posted: Tue Nov 11, 2008 9:19 pm Post subject:

pholthau · Posted: Thu Nov 13, 2008 7:38 am Post subject:

Okay, what I've done now: Stopped eth0. Removed everything in /var/lib/dhcpcd/
The following int /etc/dhcpcd.enter-hook:
route >> /root/route.enter

And /etc/dhcpcd.exit-hook as well:
route >> /root/route.exit

After starting eth0 I get the following two route outputs in route.enter:

- first one without anything eth0 related.
- second one with a single route for eth0 that seems to be provided by the dhcp server (not a default one, but a 212. net).

route.exit output is the same.

The routes that I specified in /etc/conf.d/net are not shown. They _are_ set however.

The above describes the output right after interface startup. I will report back in a few hours, after the dhcp server has updated the lease. But I guess the routes are already "forgotten" somehow

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pholthau · Posted: Thu Nov 13, 2008 7:47 am Post subject:

Oh what I just found was that there was a file /var/lib/dhcpcd/dhcpcd-eth0.info with some interesting lines:
ROUTES=''
INTERFACE='eth0'
CLASSID='dhcpcd 3.2.3'
plus a netmask/network that corresponds to the netmask/network for the route that I mentioned in my last post. Could it be that this file (apparently a leftover from dhcpcd 3) is interfering somehow?
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UberLord · Posted: Thu Nov 13, 2008 10:09 am Post subject:

The old info file is harmless and won't affect anything. I'm starting to think it's not dhcpcd related.
Try this

IN_BACKGROUND=true /etc/init.d/net.eth0 stop
IN_BACKGROUND=true /etc/init.d/net.eth0 start

I'm guessing that it will show dhcpcd being run but no routes being added. If so, please post the whole conf.d/net with comments stripped.
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pholthau · Posted: Thu Nov 13, 2008 2:26 pm Post subject:

there you go:

http://wwwhomes.uni-bielefeld.de/pholthaus/public/system/dhcpcd-outputs.txt
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UberLord · Posted: Thu Nov 13, 2008 2:37 pm Post subject:

So the routes are added? Do they show in the routing table?
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pholthau · Posted: Thu Nov 13, 2008 3:53 pm Post subject:

Yes they show up in the routing table. But only in the beginnging. After 4 hours, when the dhcp server refreshes the lease, they're gone.

They show up in the route output of enter/exit-hook, too. But only one time. The first time that the lease gets renewed.
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UberLord · Posted: Thu Nov 13, 2008 3:56 pm Post subject:

so if you do this

dhcpcd -x
dhcpcd -dB eth0

launch another terminal

route -n
<verify routes there>
dhcpcd -n eth1
<swap back to first terminal, verify dhcpcd has renewed lease>
route -n
<verify routes there>

Does it work as expected?
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pholthau · Posted: Thu Nov 13, 2008 9:10 pm Post subject:

sorry for the late reply, i was doing some sports (believe it or not

). should I do it when the interface is up? and shouldn't it be dhcpcd -x eth0? and everytime eth0 not eth1?

supposing that I should do it when the interface is up

UberLord · Posted: Fri Nov 14, 2008 9:43 am Post subject:

OK, manually re-add the routes after dhcpcd -x, or replace the dhcpcd -x command with pkill -9 dhcpcd with the routes in place.
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pholthau · Posted: Sat Nov 15, 2008 1:30 pm Post subject:

It's a bit tricky to remotely run the commands you told me

but today, i had access to the machine. dhcpcd -n eth0 issued two times.

UberLord · Posted: Sat Nov 15, 2008 4:08 pm Post subject:

pholthau · Posted: Sat Nov 15, 2008 5:08 pm Post subject:

That's my university's dhcp server. I don't have influence on it's behavior

Don't have a clue why it's NAKing. Can I disable it somehow?

EDIT: I think that they don't want us to offer services on the network so they force a new address by NAK. But a question remains: Why are the routes not added again? Since they are not part of the dhcp request but static, imo they shouldn't be deleted by the dhcp server response.....
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UberLord · Posted: Sat Nov 15, 2008 5:42 pm Post subject:

pholthau · Posted: Sun Nov 16, 2008 10:58 am Post subject:

Okay, I guess, i'll re-add them manually.

Thanks for your troubleshooting and explaining all the details to me!
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