Defaults DOT_IPV6 to off

Dockerfile

@@ -65,7 +65,7 @@ ENV VPNSP="private internet access" \
     DOT_VERBOSITY_DETAILS=0 \
     DOT_VALIDATION_LOGLEVEL=0 \
     DOT_CACHING=on \
-    DOT_IPV6=on \
+    DOT_IPV6=off \
     BLOCK_MALICIOUS=on \
     BLOCK_SURVEILLANCE=off \
     BLOCK_ADS=off \

README.md

@@ -135,7 +135,7 @@ docker run --rm --network=container:pia alpine:3.11 wget -qO- https://ipinfo.io
 | `DOT` | `on` | | ✅ | ✅ | ✅ | Activate DNS over TLS | `on`, `off` |
 | `DOT_PROVIDERS` | `cloudflare` | | ✅ | ✅ | ✅ | Comma delimited list of DNS over TLS providers | `cloudflare`, `google`, `quad9`, `quadrant`, `cleanbrowsing`, `securedns`, `libredns` |
 | `DOT_CACHING` | `on` | |  ✅ | ✅ | ✅ | DNS over TLS Unbound caching | `on`, `off` |
-| `DOT_IPV6` | `on` | | ✅ | ✅ | ✅ | DNS over TLS IPv6 resolution | `on`, `off` |
+| `DOT_IPV6` | `off` | | ✅ | ✅ | ✅ | DNS over TLS IPv6 resolution | `on`, `off` |
 | `DOT_PRIVATE_ADDRESS` | All private CIDRs ranges | | ✅ | ✅ | ✅ | Comma separated list of CIDRs or single IP addresses Unbound won't resolve to. Note that the default setting prevents DNS rebinding | |
 | `DOT_VERBOSITY` | `1` | | ✅ | ✅ | ✅ | DNS over TLS Unbound verbosity level | `0`, `1`, `2`, `3`, `4`, `5` |
 | `DOT_VERBOSITY_DETAILS` | `0` | | ✅ | ✅ | ✅ | Unbound details verbosity level | `0`, `1`, `2`, `3`, `4` |

docker-compose.yml

@@ -41,7 +41,7 @@ services:
       # DNS over TLS
       - DOT=on
       - DOT_PROVIDERS=cloudflare
-      - DOT_IPV6=on
+      - DOT_IPV6=off
       - DOT_VERBOSITY=1
       - BLOCK_MALICIOUS=on
       - BLOCK_SURVEILLANCE=off

internal/params/dns.go

@@ -130,5 +130,5 @@ func (p *reader) GetDNSOverTLSPrivateAddresses() (privateAddresses []string, err
 // GetDNSOverTLSIPv6 obtains if Unbound should resolve ipv6 addresses using ipv6 DNS over TLS
 //  servers from the environment variable DOT_IPV6
 func (p *reader) GetDNSOverTLSIPv6() (ipv6 bool, err error) {
-	return p.envParams.GetOnOff("DOT_IPV6")
+	return p.envParams.GetOnOff("DOT_IPV6", libparams.Default("off"))
 }