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test: make test-net-connect-options-ipv6.js better

Improve the robustness of test-net-connect-options-ipv6.js

PPC Suse build team encountered intermittent failures related
to dns.  Improve test to make it more robust in the face
of intermittent dns issues.

PR-URL: #5791
Reviewed-By: James M Snell <>
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mhdawson committed Mar 18, 2016
1 parent d3a7534 commit 287bdabe407bcfae7a82f0189351ac0191d6e4d1
Showing with 15 additions and 1 deletion.
  1. +15 −1 test/parallel/test-net-connect-options-ipv6.js
@@ -40,7 +40,21 @@ function tryConnect() {
}).on('error', function(err) {
if (err.syscall === 'getaddrinfo' && err.code === 'ENOTFOUND') {
// ENOTFOUND means we don't have the requested address. In this
// case we try the next one in the list and if we run out of
// candidates we assume IPv6 is not supported on the
// machine and skip the test.
// EAI_AGAIN means we tried to remotely resolve the address and
// timed out or hit some intermittent connectivity issue with the
// dns server. Although we are looking for local loopback addresses
// we may go remote since the list we search includes addresses that
// cover more than is available on any one distribution. The
// net is that if we get an EAI_AGAIN we were looking for an
// address which does not exist in this distribution so the error
// is not significant and we should just move on and try the
// next address in the list.
if ((err.syscall === 'getaddrinfo') && ((err.code === 'ENOTFOUND') ||
(err.code === 'EAI_AGAIN'))) {
if (host !== 'localhost' || --localhostTries === 0)
host = hosts[++hostIdx];
if (host)

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