diff --git a/internal/pkg/config/root.go b/internal/pkg/config/root.go
index 45bf788f..f649bd35 100644
--- a/internal/pkg/config/root.go
+++ b/internal/pkg/config/root.go
@@ -29,7 +29,6 @@ type WarewulfYaml struct {
 	Ipaddr6     string        `yaml:"ipaddr6,omitempty"`
 	Netmask     string        `yaml:"netmask,omitempty"`
 	Network     string        `yaml:"network,omitempty"`
-	Ipv6net     string        `yaml:"ipv6net,omitempty"`
 	Fqdn        string        `yaml:"fqdn,omitempty"`
 	Warewulf    *WarewulfConf `yaml:"warewulf,omitempty"`
 	API         *APIConf      `yaml:"api,omitempty"`
@@ -141,11 +140,7 @@ func (conf *WarewulfYaml) Parse(data []byte, autodetect bool) error {
 	}
 
 	if conf.Ipaddr6 != "" {
-		if _, network, err := net.ParseCIDR(conf.Ipaddr6); err == nil {
-			if conf.Ipv6net == "" {
-				conf.Ipv6net = network.IP.String()
-			}
-		} else {
+		if _, _, err := net.ParseCIDR(conf.Ipaddr6); err != nil {
 			return fmt.Errorf("invalid ipv6 address: must use CIDR notation: %s", conf.Ipaddr6)
 		}
 	}
diff --git a/internal/pkg/config/root_test.go b/internal/pkg/config/root_test.go
index bad61665..db4b9a86 100644
--- a/internal/pkg/config/root_test.go
+++ b/internal/pkg/config/root_test.go
@@ -153,53 +153,6 @@ ipaddr6: "2001:db8::1/64"
 `,
 			result: `
 ipaddr6: "2001:db8::1/64"
-ipv6net: "2001:db8::"
-warewulf:
-  autobuild overlays: true
-  grubboot: false
-  host overlay: true
-  port: 9873
-  secure: true
-  update interval: 60
-nfs:
-  enabled: true
-  systemd name: nfsd
-dhcp:
-  enabled: true
-  systemd name: dhcpd
-  template: default
-image mounts:
-- dest: /etc/resolv.conf
-  source: /etc/resolv.conf
-ssh:
-  key types:
-  - ed25519
-  - ecdsa
-  - rsa
-  - dsa
-tftp:
-  enabled: true
-  ipxe:
-    "00:00": undionly.kpxe
-    "00:07": ipxe-snponly-x86_64.efi
-    "00:09": ipxe-snponly-x86_64.efi
-    "00:0B": arm64-efi/snponly.efi
-  systemd name: tftp
-api:
-  enabled: false
-  allowed subnets:
-  - 127.0.0.0/8
-  - ::1/128
-`,
-		},
-		"ipv6 cidr conflict": {
-			input: `
-ipaddr6: "2001:db8:1::1/64"
-ipv6net: "2001:db8:2::"
-`,
-			result: `
-ipaddr6: "2001:db8:1::1/64"
-ipv6net: "2001:db8:2::"
 warewulf:
   autobuild overlays: true
   grubboot: false
diff --git a/internal/pkg/upgrade/config.go b/internal/pkg/upgrade/config.go
index 65fc2803..80b05e5e 100644
--- a/internal/pkg/upgrade/config.go
+++ b/internal/pkg/upgrade/config.go
@@ -45,7 +45,9 @@ func (legacy *WarewulfYaml) Upgrade() (upgraded *config.WarewulfYaml) {
 	upgraded.Ipaddr6 = legacy.Ipaddr6
 	upgraded.Netmask = legacy.Netmask
 	upgraded.Network = legacy.Network
-	upgraded.Ipv6net = legacy.Ipv6net
+	if legacy.Ipv6net != "" {
+		logIgnore("Ipv6net", legacy.Ipv6net, "obsolete")
+	}
 	upgraded.Fqdn = legacy.Fqdn
 	if legacy.Warewulf != nil {
 		upgraded.Warewulf = legacy.Warewulf.Upgrade()