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fix(config): apply ipv4_only IPv6 mode so TUN doesn't hijack the default IPv6 route #140

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fix(config): apply ipv4_only IPv6 mode so TUN doesn't hijack the default IPv6 route #140

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6 changes: 5 additions & 1 deletion v2/config/builder.go
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Original file line number Diff line number Diff line change
Expand Up @@ -437,7 +437,11 @@ func setInbound(options *option.Options, hopt *HiddifyOptions) {
// } else {
// inboundDomainStrategy = opt.IPv6Mode
// }
ipv6Enable := isIPv6Supported()
// Honor the user's IPv6 mode: IPv4-only must not give the TUN an IPv6
// address nor bind IPv6, otherwise the TUN captures the default IPv6
// route while egress has no usable IPv6, black-holing AAAA-first conns.
ipv6Enable := isIPv6Supported() &&
hopt.IPv6Mode != option.DomainStrategy(C.DomainStrategyIPv4Only)
if hopt.EnableTun {

opts := option.TunInboundOptions{
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