[PATCH docs/manager/network/perl-rs v4 0/6] sdn: enable force_forwarding for ipv6 forwarding

[PATCH docs/manager/network/perl-rs v4 0/6] sdn: enable force_forwarding for ipv6 forwarding

[Lukas Sichert]

Gabriel's upstream kernel patch [1] added
net.ipv6.conf.<iface>.force_forwarding. This allows enabling IPv6
forwarding on selected interfaces without requiring
net.ipv6.conf.all.forwarding.

This is useful for SDN setups because all.forwarding has host-wide side
effects. In particular, it disables Router Advertisement processing by
default, which can break SLAAC on unrelated interfaces. SDN only needs
forwarding on the VNet, exit-node, or fabric interfaces that participate
in routed IPv6 traffic.

This series generates ifupdown post-up/post-down commands for those
interfaces so force_forwarding is enabled when the interface is brought
up and reset when it is brought down. /network/interfaces.d/sdn gets
regenerated on SDN Apply. This means that removing a VNet also removes
the corresponding 'post-down' commands configured to the interface of
the VNet. Therefore it cannot happen, that deleting one VNet in the GUI
removes force_forwarding on the outgoing interfaces, which might be used
by other VNets as well. The tests are adjusted for the generated
/etc/network/interfaces.d/sdn output. Also the series rewrites the
documentation to reflect the updated behaviour and removes the UI warning
to enable 'all.forwarding'.


[1] lkml.org/lkml/2025/7/7/577

changes from v3 to v4 (thanks @Stefan):
-wrap resolving outgoing interface in eval block
-remove unnecessary 'ip6-forward' for vrfbr interface
-Drop the fabric edit GUI hint that told users to enable
net.ipv6.conf.all.forwarding
-remove whitespace formatting changes

changes from v2 to v3 (thanks @Gabriel):
-Move the IPv6 force_forwarding post-up/post-down commands out of the
subnet loop, so they are generated only once for the VNet instead of
once per subnet.
-Enable ip6-forward and force_forwarding on EVPN L3VNI VRF bridge
interfaces, fixing IPv6 forwarding when traffic exits through another
node.

changes from v1 to v2 (thanks @Gabriel, @Hannes):
-add force_forwarding also to bgp fabrics
-explicitly mention the force_forwarding flag in the documentation
-add a reference link to the sysctl documentation
-mention bgp as a fabric with ipv6 support


network:

Lukas Sichert (2):
  sdn: evpn: enable force_forwarding for ipv6 forwarding to subnets
  sdn: simple: enable force_forwarding for ipv6 forwarding to subnets

 src/PVE/Network/SDN/Zones/EvpnPlugin.pm       | 34 ++++++++++++++++++-
 src/PVE/Network/SDN/Zones/SimplePlugin.pm     | 25 +++++++++++++-
 .../expected_sdn_interfaces                   |  6 ++++
 .../exitnode_snat/expected_sdn_interfaces     |  4 +++
 .../exitnodenullroute/expected_sdn_interfaces |  6 ++++
 .../evpn/ipv4ipv6/expected_sdn_interfaces     |  4 +++
 .../zones/evpn/ipv6/expected_sdn_interfaces   |  4 +++
 .../evpn/ipv6underlay/expected_sdn_interfaces |  4 +++
 .../simple/ipv4v6/expected_sdn_interfaces     |  4 +++
 .../simple/ipv6snat/expected_sdn_interfaces   |  4 +++
 10 files changed, 93 insertions(+), 2 deletions(-)


perl-rs:

Lukas Sichert (2):
  fabrics: openfabric: enable force_forwarding for ipv6 transit traffic
  fabrics: bgp: enable force_forwarding for ipv6 transit traffic

 pve-rs/src/bindings/sdn/fabrics.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)


manager:

Lukas Sichert (1):
  ui: sdn: remove IPv6 forwarding hint from fabric edit window

 www/manager6/sdn/fabrics/FabricEdit.js | 59 +++++++++-----------------
 1 file changed, 20 insertions(+), 39 deletions(-)


docs:

Lukas Sichert (1):
  sdn: drop global ipv6 forwarding workaround from OpenFabric docs

 pvesdn.adoc | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)


Summary over all repositories:
  13 files changed, 136 insertions(+), 57 deletions(-)

-- 
Generated by murpp 0.12.0

[PATCH network v4 1/6] sdn: evpn: enable force_forwarding for ipv6 forwarding to subnets

[Lukas Sichert]

EVPN zones can route IPv6 subnet traffic through a VNet, an outgoing
interface, and, for L3VNI setups, a VRF bridge. Until now, this depended
on global IPv6 forwarding state, which also changes Router Advertisement
handling for the whole host.

Use the per-interface 'force_forwarding' setting instead. For IPv6
subnets that need forwarding, generate post-up/post-down commands for
the VNet interface, the outgoing interface, and the EVPN VRF bridge
where applicable.
Update the expected SDN interface output in the zone tests accordingly

Signed-off-by: Lukas Sichert <l.sichert@proxmox.com>
---
 src/PVE/Network/SDN/Zones/EvpnPlugin.pm       | 34 ++++++++++++++++++-
 .../expected_sdn_interfaces                   |  6 ++++
 .../exitnode_snat/expected_sdn_interfaces     |  4 +++
 .../exitnodenullroute/expected_sdn_interfaces |  6 ++++
 .../evpn/ipv4ipv6/expected_sdn_interfaces     |  4 +++
 .../zones/evpn/ipv6/expected_sdn_interfaces   |  4 +++
 .../evpn/ipv6underlay/expected_sdn_interfaces |  4 +++
 7 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
index 0e79707..80de5bf 100644
--- a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
+++ b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
@@ -302,7 +302,32 @@ sub generate_sdn_config {
     push @iface_config, "mtu $mtu" if $mtu;
     push @iface_config, "alias $alias" if $alias;
     push @iface_config, "ip-forward on" if $enable_forward_v4;
-    push @iface_config, "ip6-forward on" if $enable_forward_v6;
+
+    if ($enable_forward_v6) {
+        push @iface_config, "ip6-forward on";
+
+        push @iface_config, "post-up echo 1 > /proc/sys/net/ipv6/conf/$vnetid/force_forwarding";
+        push @iface_config, "post-down echo 0 > /proc/sys/net/ipv6/conf/$vnetid/force_forwarding";
+
+        if ($is_evpn_gateway) {
+            #find outgoing ipv6 interface
+            my ($outip, $outiface);
+            eval {
+                ($outip, $outiface) =
+                    PVE::Network::SDN::Zones::Plugin::get_local_route_ip('2001:4860:4860::8888');
+            };
+            if ($@) {
+                my $msg = "interface for IPv6 forwarding could not be resolved: $@";
+                log_warn($msg);
+            } elsif ($outiface) {
+                push @iface_config,
+                    "post-up echo 1 > /proc/sys/net/ipv6/conf/$outiface/force_forwarding";
+                push @iface_config,
+                    "post-down echo 0 > /proc/sys/net/ipv6/conf/$outiface/force_forwarding";
+            }
+        }
+    }
+
     push @iface_config, "arp-accept on" if $ipv4 || $ipv6;
     push @iface_config, "vrf $vrf_iface" if $vrf_iface;
     push(@{ $config->{$vnetid} }, @iface_config) if !$config->{$vnetid};
@@ -342,6 +367,13 @@ sub generate_sdn_config {
             push @iface_config, "bridge_fd 0";
             push @iface_config, "mtu $mtu" if $mtu;
             push @iface_config, "vrf $vrf_iface";
+
+            if ($enable_forward_v6) {
+                push @iface_config,
+                    "post-up echo 1 > /proc/sys/net/ipv6/conf/$brvrf/force_forwarding";
+                push @iface_config,
+                    "post-down echo 0 > /proc/sys/net/ipv6/conf/$brvrf/force_forwarding";
+            }
             push(@{ $config->{$brvrf} }, @iface_config) if !$config->{$brvrf};
         }
 
diff --git a/src/test/zones/evpn/exitnode_local_routing_ipv6/expected_sdn_interfaces b/src/test/zones/evpn/exitnode_local_routing_ipv6/expected_sdn_interfaces
index b46d4e7..7b8dc3c 100644
--- a/src/test/zones/evpn/exitnode_local_routing_ipv6/expected_sdn_interfaces
+++ b/src/test/zones/evpn/exitnode_local_routing_ipv6/expected_sdn_interfaces
@@ -8,6 +8,10 @@ iface myvnet
 	bridge_fd 0
 	mtu 1450
 	ip6-forward on
+	post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
 	arp-accept on
 	vrf vrf_myzone
 
@@ -23,6 +27,8 @@ iface vrfbr_myzone
 	bridge_fd 0
 	mtu 1450
 	vrf vrf_myzone
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
 
 auto vrfvx_myzone
 iface vrfvx_myzone
diff --git a/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces b/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces
index 0d7d174..2addde0 100644
--- a/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces
+++ b/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces
@@ -27,6 +27,10 @@ iface myvnet2
 	bridge_fd 0
 	mtu 1450
 	ip6-forward on
+	post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet2/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet2/force_forwarding
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
 	arp-accept on
 	vrf vrf_myzone
 
diff --git a/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces b/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces
index 4bf5ccf..e406258 100644
--- a/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces
+++ b/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces
@@ -14,6 +14,10 @@ iface myvnet
 	mtu 1450
 	ip-forward on
 	ip6-forward on
+	post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
 	arp-accept on
 	vrf vrf_myzone
 
@@ -47,6 +51,8 @@ iface vrfbr_myzone
 	bridge_fd 0
 	mtu 1450
 	vrf vrf_myzone
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
 
 auto vrfbr_myzone2
 iface vrfbr_myzone2
diff --git a/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces b/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces
index 7a5d741..a1fdb2b 100644
--- a/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces
+++ b/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces
@@ -11,6 +11,8 @@ iface myvnet
 	mtu 1450
 	ip-forward on
 	ip6-forward on
+	post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
 	arp-accept on
 	vrf vrf_myzone
 
@@ -26,6 +28,8 @@ iface vrfbr_myzone
 	bridge_fd 0
 	mtu 1450
 	vrf vrf_myzone
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
 
 auto vrfvx_myzone
 iface vrfvx_myzone
diff --git a/src/test/zones/evpn/ipv6/expected_sdn_interfaces b/src/test/zones/evpn/ipv6/expected_sdn_interfaces
index b2bdbfe..4363842 100644
--- a/src/test/zones/evpn/ipv6/expected_sdn_interfaces
+++ b/src/test/zones/evpn/ipv6/expected_sdn_interfaces
@@ -9,6 +9,8 @@ iface myvnet
 	bridge_fd 0
 	mtu 1450
 	ip6-forward on
+	post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
 	arp-accept on
 	vrf vrf_myzone
 
@@ -24,6 +26,8 @@ iface vrfbr_myzone
 	bridge_fd 0
 	mtu 1450
 	vrf vrf_myzone
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
 
 auto vrfvx_myzone
 iface vrfvx_myzone
diff --git a/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces b/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces
index 3b91f75..7aaf569 100644
--- a/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces
+++ b/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces
@@ -9,6 +9,8 @@ iface myvnet
 	bridge_fd 0
 	mtu 1450
 	ip6-forward on
+	post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
 	arp-accept on
 	vrf vrf_myzone
 
@@ -24,6 +26,8 @@ iface vrfbr_myzone
 	bridge_fd 0
 	mtu 1450
 	vrf vrf_myzone
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding
 
 auto vrfvx_myzone
 iface vrfvx_myzone
-- 
2.47.3

[PATCH network v4 2/6] sdn: simple: enable force_forwarding for ipv6 forwarding to subnets

[Lukas Sichert]

Simple zones can route ipv6 subnet traffic through a VNet bridge. Until
now, this depended on global ipv6 forwarding state, which also changes
Router Advertisement handling for the whole host.

Use the per-interface 'force_forwarding' setting instead. For ipv6
subnets that need forwarding, generate post-up/post-down commands for
both the VNet interface and the outgoing interface.
Update the expected SDN interface output in the zone tests accordingly.

Signed-off-by: Lukas Sichert <l.sichert@proxmox.com>
---
 src/PVE/Network/SDN/Zones/SimplePlugin.pm     | 25 ++++++++++++++++++-
 .../simple/ipv4v6/expected_sdn_interfaces     |  4 +++
 .../simple/ipv6snat/expected_sdn_interfaces   |  4 +++
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/src/PVE/Network/SDN/Zones/SimplePlugin.pm b/src/PVE/Network/SDN/Zones/SimplePlugin.pm
index 347eee9..854a761 100644
--- a/src/PVE/Network/SDN/Zones/SimplePlugin.pm
+++ b/src/PVE/Network/SDN/Zones/SimplePlugin.pm
@@ -149,7 +149,30 @@ sub generate_sdn_config {
     push @iface_config, "mtu $mtu" if $mtu;
     push @iface_config, "alias $alias" if $alias;
     push @iface_config, "ip-forward on" if $enable_forward_v4;
-    push @iface_config, "ip6-forward on" if $enable_forward_v6;
+
+    if ($enable_forward_v6) {
+        push @iface_config, "ip6-forward on";
+
+        push @iface_config, "post-up echo 1 > /proc/sys/net/ipv6/conf/$vnetid/force_forwarding";
+        push @iface_config, "post-down echo 0 > /proc/sys/net/ipv6/conf/$vnetid/force_forwarding";
+
+        #find outgoing ipv6 interface
+        my ($outip, $outiface);
+        eval {
+            ($outip, $outiface) =
+                PVE::Network::SDN::Zones::Plugin::get_local_route_ip('2001:4860:4860::8888');
+        };
+        if ($@) {
+            my $msg = "interface for IPv6 forwarding could not be resolved: $@";
+            log_warn($msg);
+        } elsif ($outiface) {
+            push @iface_config,
+                "post-up echo 1 > /proc/sys/net/ipv6/conf/$outiface/force_forwarding";
+            push @iface_config,
+                "post-down echo 0 > /proc/sys/net/ipv6/conf/$outiface/force_forwarding";
+        }
+
+    }
 
     push @{ $config->{$vnetid} }, @iface_config;
 
diff --git a/src/test/zones/simple/ipv4v6/expected_sdn_interfaces b/src/test/zones/simple/ipv4v6/expected_sdn_interfaces
index 34ed5db..61b7258 100644
--- a/src/test/zones/simple/ipv4v6/expected_sdn_interfaces
+++ b/src/test/zones/simple/ipv4v6/expected_sdn_interfaces
@@ -9,3 +9,7 @@ iface myvnet
 	bridge_fd 0
 	ip-forward on
 	ip6-forward on
+	post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
diff --git a/src/test/zones/simple/ipv6snat/expected_sdn_interfaces b/src/test/zones/simple/ipv6snat/expected_sdn_interfaces
index 5f6d40b..4df3371 100644
--- a/src/test/zones/simple/ipv6snat/expected_sdn_interfaces
+++ b/src/test/zones/simple/ipv6snat/expected_sdn_interfaces
@@ -11,3 +11,7 @@ iface myvnet
 	bridge_stp off
 	bridge_fd 0
 	ip6-forward on
+	post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding
+	post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
+	post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding
-- 
2.47.3

[PATCH perl-rs v4 3/6] fabrics: openfabric: enable force_forwarding for ipv6 transit traffic

[Lukas Sichert]

In a non-full-mesh OpenFabric setup, nodes may need to relay traffic
between peers that are not directly connected. This requires forwarding
ipv6 packets between fabric bridges. With the addition of
'force_forwarding' to the Linux kernel, this can be done without
enabling 'all.forwarding', which disables Router Advertisements.

Configure fabric bridges with the required 'post-up'/'post-down'
commands to enable 'force_forwarding'.

Signed-off-by: Lukas Sichert <l.sichert@proxmox.com>
---
 pve-rs/src/bindings/sdn/fabrics.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pve-rs/src/bindings/sdn/fabrics.rs b/pve-rs/src/bindings/sdn/fabrics.rs
index f96b6b1..785b537 100644
--- a/pve-rs/src/bindings/sdn/fabrics.rs
+++ b/pve-rs/src/bindings/sdn/fabrics.rs
@@ -596,6 +596,16 @@ pub mod pve_rs_sdn_fabrics {
             writeln!(interface, "\tlink-type {link_type}")?;
         }
         writeln!(interface, "\tip-forward 1")?;
+        if cidr.is_ipv6() {
+            writeln!(
+                interface,
+                "\tpost-up echo 1 > /proc/sys/net/ipv6/conf/{name}/force_forwarding"
+            )?;
+            writeln!(
+                interface,
+                "\tpost-down echo 0 > /proc/sys/net/ipv6/conf/{name}/force_forwarding"
+            )?;
+        }
 
         Ok(interface)
     }
-- 
2.47.3

[PATCH perl-rs v4 4/6] fabrics: bgp: enable force_forwarding for ipv6 transit traffic

[Lukas Sichert]

In a non-full-mesh BGP-fabric setup, nodes may need to relay traffic
between peers that are not directly connected. This requires forwarding
ipv6 packets between fabric bridges. With the addition of
'force_forwarding' to the Linux kernel, this can be done without
enabling 'all.forwarding', which disables Router Advertisements.

Configure fabric bridges with the required 'post-up'/'post-down'
commands to enable 'force_forwarding'.

Signed-off-by: Lukas Sichert <l.sichert@proxmox.com>
---
 pve-rs/src/bindings/sdn/fabrics.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pve-rs/src/bindings/sdn/fabrics.rs b/pve-rs/src/bindings/sdn/fabrics.rs
index 785b537..000ecb7 100644
--- a/pve-rs/src/bindings/sdn/fabrics.rs
+++ b/pve-rs/src/bindings/sdn/fabrics.rs
@@ -774,6 +774,14 @@ pub mod pve_rs_sdn_fabrics {
                             writeln!(interfaces, "iface {name} inet manual")?;
                             writeln!(interfaces, "\tip-forward 1")?;
                             writeln!(interfaces, "\tip6-forward 1")?;
+                            writeln!(
+                                interfaces,
+                                "\tpost-up echo 1 > /proc/sys/net/ipv6/conf/{name}/force_forwarding"
+                            )?;
+                            writeln!(
+                                interfaces,
+                                "\tpost-down echo 0 > /proc/sys/net/ipv6/conf/{name}/force_forwarding"
+                            )?;
                             // BGP unnumbered uses RAs to discover peer link-local
                             // addresses. frr listens for them itself, but the kernel
                             // would otherwise install RA-derived routes we don't want.
-- 
2.47.3

[PATCH manager v4 5/6] ui: sdn: remove IPv6 forwarding hint from fabric edit window

[Lukas Sichert]

The fabric edit window warned users to enable global IPv6 forwarding
when configuring an IPv6 fabric prefix. This is no longer required, as
the SDN backend now enables per-interface IPv6 forwarding where needed
via force_forwarding.

Remove the hint to avoid suggesting the broader host-wide sysctl
setting, which can disable Router Advertisements on the host.

Signed-off-by: Lukas Sichert <l.sichert@proxmox.com>
---
 www/manager6/sdn/fabrics/FabricEdit.js | 59 +++++++++-----------------
 1 file changed, 20 insertions(+), 39 deletions(-)

diff --git a/www/manager6/sdn/fabrics/FabricEdit.js b/www/manager6/sdn/fabrics/FabricEdit.js
index e9e0d1fa..a8c71785 100644
--- a/www/manager6/sdn/fabrics/FabricEdit.js
+++ b/www/manager6/sdn/fabrics/FabricEdit.js
@@ -13,12 +13,6 @@ Ext.define('PVE.sdn.Fabric.Fabric.Edit', {
 
     baseUrl: '/cluster/sdn/fabrics/fabric',
 
-    viewModel: {
-        data: {
-            showIpv6ForwardingHint: false,
-        },
-    },
-
     items: [
         {
             xtype: 'textfield',
@@ -83,42 +77,29 @@ Ext.define('PVE.sdn.Fabric.Fabric.Edit', {
         }
 
         if (me.hasIpv6Support) {
-            me.items.push(
-                {
-                    xtype: 'displayfield',
-                    value: 'To make IPv6 fabrics work, enable global IPv6 forwarding on all nodes. Click on the Help button for more details.',
-                    bind: {
-                        hidden: '{!showIpv6ForwardingHint}',
-                    },
-                    userCls: 'pmx-hint',
+            me.items.push({
+                xtype: 'proxmoxtextfield',
+                fieldLabel: gettext('IPv6 Prefix'),
+                labelWidth: 120,
+                name: 'ip6_prefix',
+                disabled: me.disableIpPrefixEdit,
+                allowBlank: true,
+                vtype: 'IP6CIDRAddress',
+                skipEmptyText: true,
+                deleteEmpty: !me.isCreate,
+                validator: function (value) {
+                    let ipPrefix = this.up('window').down('[name=ip_prefix]')?.getValue();
+                    if (value || ipPrefix) {
+                        return true;
+                    }
+                    return gettext('Either IPv4 Prefix or IPv6 Prefix is required');
                 },
-                {
-                    xtype: 'proxmoxtextfield',
-                    fieldLabel: gettext('IPv6 Prefix'),
-                    labelWidth: 120,
-                    name: 'ip6_prefix',
-                    disabled: me.disableIpPrefixEdit,
-                    allowBlank: true,
-                    vtype: 'IP6CIDRAddress',
-                    skipEmptyText: true,
-                    deleteEmpty: !me.isCreate,
-                    validator: function (value) {
-                        let ipPrefix = this.up('window').down('[name=ip_prefix]')?.getValue();
-                        if (value || ipPrefix) {
-                            return true;
-                        }
-                        return gettext('Either IPv4 Prefix or IPv6 Prefix is required');
-                    },
-                    listeners: {
-                        change: function (textbox, value) {
-                            let win = textbox.up('window');
-                            let vm = win.getViewModel();
-                            vm.set('showIpv6ForwardingHint', !!value);
-                            win.down('[name=ip_prefix]')?.validate();
-                        },
+                listeners: {
+                    change: function (textbox) {
+                        textbox.up('window').down('[name=ip_prefix]')?.validate();
                     },
                 },
-            );
+            });
         }
 
         if (me.additionalTabs.length > 0) {
-- 
2.47.3

[PATCH docs v4 6/6] sdn: drop global ipv6 forwarding workaround from OpenFabric docs

[Lukas Sichert]

OpenFabric fabrics with ipv6 need forwarding on transit nodes so packets
can be relayed between peers that are not directly connected.

Drop the old recommendation to enable host-wide
net.ipv6.conf.all.forwarding from the documentation. The generated fabric
interface configuration now handles the required forwarding setup, so the
manual global forwarding workaround is no longer needed.

Signed-off-by: Lukas Sichert <l.sichert@proxmox.com>
---
 pvesdn.adoc | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

diff --git a/pvesdn.adoc b/pvesdn.adoc
index d20a0eb..d11fec7 100644
--- a/pvesdn.adoc
+++ b/pvesdn.adoc
@@ -604,23 +604,12 @@ behavior and proper source address selection throughout the fabric.
 Notes on IPv6
 ^^^^^^^^^^^^^
 
-IPv6 is currently only usable on OpenFabric fabrics. These IPv6 Fabrics need
-global IPv6 forwarding enabled on all nodes contained in the fabric. Without
+IPv6 is currently only usable on OpenFabric and BGP fabrics. These IPv6 Fabrics
+need IPv6 forwarding enabled on all transit nodes contained in the fabric. Without
 IPv6 forwarding, non-full-mesh fabrics won't work because the transit nodes
-don't forward packets to the outer nodes. Currently there isn't an easy way to
-enable IPv6 forwarding per-interface like with IPv4, so it has to be enabled
-globally. This can be accomplished by appending this line:
-
-----
-post-up sysctl -w net.ipv6.conf.all.forwarding=1
-----
-
-to a fabric interface in the `/etc/network/interfaces` file. This will enable
-IPv6 forwarding globally once that interface comes up. Note that this affects
-how your interfaces handle automatic IPv6 setup (SLAAC), Neighbour
-Advertisements, Router Solicitations, and Router Advertisements. More details
-here: https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt under
-`net.ipv6.conf.all.forwarding`.
+don't forward packets to the outer nodes. IPv6 forwarding is enabled by default
+on the necessary interfaces using the force_forwarding flag. More details here:
+docs.kernel.org/networking/ip-sysctl.html
 
 [[pvesdn_openfabric]]
 OpenFabric
-- 
2.47.3