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Description of problem:

Citing from [1]:
"Whenever I try to access my kubernetes services, it seems some requests get a slight pause that is pretty noticeable. Investigating it, I found that SSHing into my k8s nodes and trying to ping the different pods that are located on other nodes, I see the first ping packet completely lost. After doing that excursive for the first time, the next time I run ping command all packets seem to be fine."

[1] https://github.com/coreos/flannel/issues/172

Version-Release number of selected component (if applicable):
flannel-0.2.0-10.el7

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2481.html