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Improved detect in ipv6IsEnabled() (#555)

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* Improved detect in ipv6IsEnabled()

* Added comments in ipv6IsEnabled.

Problem described in #155
This commit is contained in:
Lars Ekman 2018-10-27 05:51:38 +02:00 committed by Murali Reddy
parent 827bbbcd4d
commit f95cdedfaa
1 changed files with 8 additions and 1 deletions
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9
pkg/controllers/routing/utils.go
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@ -83,7 +83,14 @@ func ipv4IsEnabled() bool {
} }
func ipv6IsEnabled() bool { func ipv6IsEnabled() bool {
l, err := net.Listen("tcp6", "") // If ipv6 is disabled with;
//
// sysctl -w net.ipv6.conf.all.disable_ipv6=1
//
// It is still possible to listen on the any-address "::". So this
// function tries the loopback address "::1" which must be present
// if ipv6 is enabled.
l, err := net.Listen("tcp6", "[::1]:0")
if err != nil { if err != nil {
return false return false
} }