diff --git a/go.mod b/go.mod
index 29e26ab3..97469ce8 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/fatih/color v1.9.0
 	github.com/golang/mock v1.4.4
 	github.com/kyokomi/emoji v2.2.4+incompatible
-	github.com/qdm12/golibs v0.0.0-20201024185935-092412448c2c
+	github.com/qdm12/golibs v0.0.0-20201025221346-fe352060c25a
 	github.com/qdm12/ss-server v0.0.0-20200819124651-6428e626ee83
 	github.com/stretchr/testify v1.6.1
 	github.com/vishvananda/netlink v1.1.0
diff --git a/go.sum b/go.sum
index 3161d4b3..8aaed7db 100644
--- a/go.sum
+++ b/go.sum
@@ -74,6 +74,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/qdm12/golibs v0.0.0-20201024185935-092412448c2c h1:9EQyDXbeapnPeMeO8Yq7PE6zqYPGkHp/qijNBBTU74c=
 github.com/qdm12/golibs v0.0.0-20201024185935-092412448c2c/go.mod h1:pikkTN7g7zRuuAnERwqW1yAFq6pYmxrxpjiwGvb0Ysc=
+github.com/qdm12/golibs v0.0.0-20201025221346-fe352060c25a h1:v0zUA1FWeVkTEd9KyxfehbRVJeFGOqyMY6FHO/Q9ITU=
+github.com/qdm12/golibs v0.0.0-20201025221346-fe352060c25a/go.mod h1:pikkTN7g7zRuuAnERwqW1yAFq6pYmxrxpjiwGvb0Ysc=
 github.com/qdm12/ss-server v0.0.0-20200819124651-6428e626ee83 h1:b7sNsgsKxH0mbl9L1hdUp5KSDkZ/1kOQ+iHiBVgFElM=
 github.com/qdm12/ss-server v0.0.0-20200819124651-6428e626ee83/go.mod h1:ABVUkxubboL3vqBkOwDV9glX1/x7SnYrckBe5d+M/zw=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 h1:f/FNXud6gA3MNr8meMVVGxhp+QBTqY91tM8HjEuMjGg=
diff --git a/internal/params/params.go b/internal/params/params.go
index 369579f1..345d25a7 100644
--- a/internal/params/params.go
+++ b/internal/params/params.go
@@ -159,3 +159,10 @@ func (r *reader) GetVPNSP() (vpnServiceProvider models.VPNProvider, err error) {
 func (r *reader) GetVersionInformation() (enabled bool, err error) {
 	return r.envParams.GetOnOff("VERSION_INFORMATION", libparams.Default("on"))
 }
+
+func (r *reader) onRetroActive(oldKey, newKey string) {
+	r.logger.Warn(
+		"You are using the old environment variable %s, please consider changing it to %s",
+		oldKey, newKey,
+	)
+}
diff --git a/internal/params/routing.go b/internal/params/routing.go
index 9b21e475..d383cc35 100644
--- a/internal/params/routing.go
+++ b/internal/params/routing.go
@@ -4,13 +4,19 @@ import (
 	"fmt"
 	"net"
 	"strings"
+
+	libparams "github.com/qdm12/golibs/params"
 )
 
 // GetOutboundSubnets obtains the CIDR subnets from the comma separated list of the
 // environment variable FIREWALL_OUTBOUND_SUBNETS.
 func (r *reader) GetOutboundSubnets() (outboundSubnets []net.IPNet, err error) {
 	const key = "FIREWALL_OUTBOUND_SUBNETS"
-	s, err := r.envParams.GetEnv(key)
+	retroOption := libparams.RetroKeys(
+		[]string{"EXTRA_SUBNETS"},
+		r.onRetroActive,
+	)
+	s, err := r.envParams.GetEnv(key, retroOption)
 	if err != nil {
 		return nil, err
 	} else if s == "" {