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troglobit / pimd

PIM-SM/SSM multicast routing for UNIX and Linux
http://troglobit.com/projects/pimd/
BSD 3-Clause "New" or "Revised" License
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PIMD can't find the unicast route #159

Closed miiguelpereiraa closed 4 years ago

miiguelpereiraa commented 4 years ago

Hi,

I'm working with the topology below.

image

The pimd daemon is running on R1. The S1 is a OVS switch controlled by ONOS, running a PIM app. In the test that I'm trying to do, both S1 and R1 detect each other has PIM Neighbours, but when R1 (running pimd) receives a PIM Join message at interface 2, sent by S1, it searches the unicast routing table for a route to H2 (10.0.2.1) but it can't find the static route configured (see prints bellow)

Screenshot from 2020-07-15 10-46-35

Screenshot from 2020-07-15 10-48-08

I've tried to configure a direct route to 10.0.2.1 but it didn't work. I've already tried to change the rp_filter option to "0" at R1 but the problem persisted. Could you please help me solve this problem?

Thank you very much in advance.

troglobit commented 4 years ago

Hmm, that's really odd. Is there something else I should know before trying to replicate? E.g., host system OS/architecture and pimd version.

miiguelpereiraa commented 4 years ago

Hi,

Thank you very much for your response. In the test that I talked about earlier, I was starting pimd with a configuration file that I made where I disabled interface 1 of R1 (because I only wanted to listen to pim messages at interface 2). Has I was trying to debug the problem, I listed the IGMP interfaces in pimd and I noticed that just interface 2 of R1 was listed. Then I tested running pimd with its default configuration (without using any config file) so that pimd was activated at all interfaces and the problem was resolved. I was able to receive traffic at H1 from the group and source that I was interested in.

I guess I can't disable pimd in interfaces where I will receive multicast traffic.

Best Regards.

troglobit commented 4 years ago

Hi, yeah that's correct. A PIM router must have access to all interfaces it is supposed to act on. Even on a receiver-only network.

Since you've resolved the issue yourself, I'm assuming we can close it.