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    <p>$NS_TIMES is not set value which lead  run if4-addr-chage to
      failure.<br>
      failure message as below:<br>
--------------------------------------------------------------------------------------------<br>
      /opt/ltp/testcases/bin/if4-addr-change: line 24: / 20: syntax
      error: operand expected (error token is "/ 20")<br>
--------------------------------------------------------------------------------------------<br>
      Signed-off-by:  Lianwen Sun  <a class="moz-txt-link-rfc2396E" href="mailto:sunlw.fnst@cn.fujitsu.com"><sunlw.fnst@cn.fujitsu.com></a><br>
      ---<br>
       testcases/network/stress/interface/if4-addr-change | 4 ++--<br>
       1 file changed, 2 insertions(+), 2 deletions(-)<br>
      <br>
      diff --git a/testcases/network/stress/interface/if4-addr-change
      b/testcases/network/stress/interface/if4-addr-change<br>
      index a665b85ff..4eaabd70c 100644<br>
      --- a/testcases/network/stress/interface/if4-addr-change<br>
      +++ b/testcases/network/stress/interface/if4-addr-change<br>
      @@ -21,12 +21,12 @@ TST_TOTAL=1<br>
       TCID=if4-addr-change<br>
       TST_CLEANUP="do_cleanup"<br>
      <br>
      +. test_net.sh<br>
      +<br>
       CHECK_INTERVAL=${CHECK_INTERVAL:-$(($NS_TIMES / 20))}<br>
       # Maximum host portion of the IPv4 address on the local host<br>
       LHOST_IPV4_HOST_MAX="254"<br>
      <br>
      -. test_net.sh<br>
      -<br>
       do_cleanup()<br>
       {<br>
              tst_restore_ipaddr<br>
      -- <br>
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