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Bug #1456

closed

UDP multicast does not work properly

Added by Yi Huang over 10 years ago. Updated over 10 years ago.

Status:
Rejected
Priority:
Normal
Assignee:
-
Category:
Faces
Target version:
v0.1
Start date:
Due date:
% Done:

0%

Estimated time:

Description

NFD commit c1d6a6b089489a41f30355829435e86eb559d088

Steps to reproduce:

Follow the steps in task 1390 or run the attached script.

The script I am using is attached. Please place them in the same directory with same path on each node.

When I test with ethernet multicast face, the test passed. The command to test with ethernet face is:

./multicast-test.sh eth1 10.0.0.2 10.0.0.3

However, when I test with udp multicast face (./multicast-test.sh 10.0.0.1 10.0.0.2 10.0.0.3), it failed because no data come back for ndn:/test-mcast/B/1. ndn-traffic-server log on host B shows that it saw the interest.

Additional information:

I have run traceroute from all three nodes and they are able to reach the other two nodes within one hop.
I have tested tcp-udp-tunnel scenario using A and B from above. The test passed.
In multicast-test.sh I tried to comment out the lines that starts nfd and ndn-traffic-server on C. I still cannot get data back for ndn:/test-mcast/B/1.

Files

Download all files
multicast-test.sh (2.65 KB) multicast-test.sh Yi Huang, 04/09/2014 08:37 PM
NDNTrafficServerB.conf (969 Bytes) NDNTrafficServerB.conf Yi Huang, 04/09/2014 08:37 PM
NDNTrafficServerC.conf (969 Bytes) NDNTrafficServerC.conf Yi Huang, 04/09/2014 08:37 PM
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 #1

Updated by Yi Huang over 10 years ago

  • Tracker changed from Task to Bug
  • Target version set to v0.1
  • Start date deleted (04/09/2014)
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 #2

Updated by Junxiao Shi over 10 years ago

  • Category set to Faces
  • Status changed from New to Rejected

I cannot reproduce this bug with NFD commit edae353eae13ff94c2d780489b36b832cced2212.

Attempted steps:

  1. start NFD on hostA and hostB (two hosts are enough because report says bug persists if hostC doesn't run NFD)

  2. on hostA, execute

    build/bin/nfdc set-strategy ndn:/ ndn:/localhost/nfd/strategy/broadcast
for faceid in `build/bin/nfd-status -f | grep -e 'udp4://' -e ':56363' | awk '{ print $1 }' | cut -d= -f2`
do
    build/bin/nfdc add-nexthop ndn:/test-mcast $faceid
done

  3. on hostB, start ndnpingserver /test-mcast

  4. on hostA, execute ndnping /test-mcast

ndnping is able to receive Data in the last step.

I believe these simplified steps are equivalent to those listed in #1390 for testing UDP multicast between two hosts.

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 #3

Updated by Yi Huang over 10 years ago

That is why I didn't understand and thought it might be a VM specific issue. Actually host C works as expected. Only ndn:/test-mcast/B/1 cannot get data back.

When I run my script with nfd and traffic generator disabled on B, the test passed as well.

However, when I disable nfd and traffic generator on C, the test failed. I cannot even get data for ndn:/test-mcast/Z/1. server log shows that the server saw the interest.

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 #4

Updated by Junxiao Shi over 10 years ago

Please report these from host B:

  • In nfd.conf, what's the value of udp.mcast?
  • Does tcpdump show a Data packet from B's unicast IP to the multicast group IP? What's the size of this packet, compared to MTU?
  • Set log level of Forwarder to TRACE. Does the log show outgoing Data pipeline is entered for a Data toward the multicast face?

Also try using 10.0.0.3 as B, and 10.0.0.2 as C. Does the problem persist on B?

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