No Error/ Warning when IPv6 is disabled about openr

[butjar]

I found the cause of this issue. I'm running the mininet install script on the VM which disables IPv6.

[saifhhasan]

Hello @butjar, thank you for raising the issue. Agree that Open/R should spit error or fatal when ipv6 is not enabled.

What are the logs when FibService comes up ?

Do you have good flag/syscall that can give status of ipv6 support on host ?

[butjar]

Hello @butjar, thank you for raising the issue. Agree that Open/R should spit error or fatal when ipv6 is not enabled.

👍

What are the logs when FibService comes up ?

Successful log looks like this:

Log file created at: 2019/04/24 15:08:09
Running on machine: mininet-vm
Log line format: [IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line] msg
I0424 15:08:09.430593 10772 Main.cpp:164]
I0424 15:08:09.441813 10777 Main.cpp:249] Starting Watchdog thread ...
I0424 15:08:09.442754 10772 NetlinkMessage.cpp:113] Netlink socket created.45
I0424 15:08:09.454826 10781 Main.cpp:284] Starting NetlinkEvl thread ...
I0424 15:08:09.467128 10787 Main.cpp:352] Starting main event loop...
I0424 15:08:09.470342 10786 Main.cpp:334] Starting NetlinkSystem server...
I0424 15:08:09.471438 10786 ThriftServer.cpp:226] libevent 2.0.21-stable method
epoll
I0424 15:08:09.471803 10786 ThriftServer.cpp:297] Using 0 SSL handshake threads
I0424 15:08:09.472631 10785 Main.cpp:310] Starting NetlinkFib server...
I0424 15:08:09.472726 10785 ThriftServer.cpp:226] libevent 2.0.21-stable method
epoll
I0424 15:08:09.472792 10785 ThriftServer.cpp:297] Using 0 SSL handshake threads
I0424 15:08:10.472007 10772 Main.cpp:92] Waiting for FibService to come up...
I0424 15:08:10.486464 10792 ThreadManager-inl.h:367] ThreadManager::add called w
ith numa == true, but not a NumaThreadManager
I0424 15:08:10.488356 10772 Main.cpp:103] FibService up. Waited for 1021 ms.
I0424 15:08:10.488356 10772 Main.cpp:103] FibService up. Waited for 1021 ms.
I0424 15:08:10.489377 10772 PersistentStore.cpp:144] Failed to read file content
s from '/tmp/aq_persistent_config_store.bin'. Error (2): No such file or directo
se from file: /tmp/aq_persistent_config_store.bin
I0424 15:08:10.491820 10845 Main.cpp:127] Starting PERSISTENT_STORE thread ...
I0424 15:08:10.493969 10846 Main.cpp:387] Starting ZmqMonitor thread...
I0424 15:08:10.496381 10847 Main.cpp:127] Starting KVSTORE thread ...
I0424 15:08:10.499099 10848 Main.cpp:127] Starting PREFIX_MANAGER thread ...
I0424 15:08:10.501531 10849 Main.cpp:127] Starting SPARK thread ...
I0424 15:08:10.501585 10849 Spark.cpp:237] Constructing Spark server for node r1
callbacks...
I0424 15:08:10.507259 10772 LinkMonitor.cpp:157] Loading link-monitor config
vents
I0424 15:08:10.510160 10850 Main.cpp:127] Starting LINK_MONITOR thread ...
fig. Setting node as UNDRAINED
I0424 15:08:10.512239 10851 Main.cpp:127] Starting DECISION thread ...
lbacks...
I0424 15:08:10.514895 10852 Main.cpp:127] Starting FIB thread ...
I0424 15:08:10.515913 10853 Main.cpp:793] Starting thriftCtrlServer thread ...

Do you have good flag/syscall that can give status of ipv6 support on host ?

The mininet install script for example disables IPv6 with several kernel parameters:

• In /etc/sysctl.conf:
  • net.ipv6.conf.all.disable_ipv6 = 1
  • net.ipv6.conf.default.disable_ipv6 = 1
  • net.ipv6.conf.lo.disable_ipv6 = 1
• In /etc/default/grub:
  • GRUB_CMDLINE_LINUX_DEFAULT="quiet splash ipv6.disable=1"

Maybe you could do something like this:

sysctl -a | grep disable_ipv6

I guess it's best to debug the FibService Thread and check what happens if you disable IPv6 like above and why it is not coming up.

[saifhhasan]

Hello @butjar - we have added solid check for IPv6 that is impossible to overlook - 89d390e#diff-3ff745aa12685f9160c30eaec4070600

Closing the issue. Thanks for flagging it and making Open/R better :)

[butjar]

Awesome 👍