From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [IPv6:2a01:7e0:0:424::9]) by lore.proxmox.com (Postfix) with ESMTPS id 6C4F41FF141 for ; Tue, 02 Jun 2026 11:01:47 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id A26A7BACF; Tue, 2 Jun 2026 11:01:45 +0200 (CEST) Date: Tue, 2 Jun 2026 11:01:40 +0200 From: Gabriel Goller To: Lukas Sichert Subject: Re: [PATCH docs 4/4] sdn: drop global IPv6 forwarding workaround from OpenFabric docs Message-ID: Mail-Followup-To: Lukas Sichert , pve-devel@lists.proxmox.com References: <20260601151550.118977-1-l.sichert@proxmox.com> <20260601151550.118977-5-l.sichert@proxmox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260601151550.118977-5-l.sichert@proxmox.com> User-Agent: NeoMutt/20241002-35-39f9a6 X-Bm-Milter-Handled: 55990f41-d878-4baa-be0a-ee34c49e34d2 X-Bm-Transport-Timestamp: 1780390865845 X-SPAM-LEVEL: Spam detection results: 0 AWL 0.029 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% DMARC_MISSING 0.1 Missing DMARC policy KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record Message-ID-Hash: WLRPPPX3SOI6WM5R2WJ7DK6TPX2P4S2V X-Message-ID-Hash: WLRPPPX3SOI6WM5R2WJ7DK6TPX2P4S2V X-MailFrom: g.goller@proxmox.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: pve-devel@lists.proxmox.com X-Mailman-Version: 3.3.10 Precedence: list List-Id: Proxmox VE development discussion List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On 01.06.2026 17:15, Lukas Sichert wrote: > 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 > --- > pvesdn.adoc | 18 +++--------------- > 1 file changed, 3 insertions(+), 15 deletions(-) > > diff --git a/pvesdn.adoc b/pvesdn.adoc > index d20a0eb..ac7240c 100644 > --- a/pvesdn.adoc > +++ b/pvesdn.adoc > @@ -605,22 +605,10 @@ 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 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 fowarding is enabled per default > +on the necessary interfaces. > > [[pvesdn_openfabric]] > OpenFabric > -- I'd mention here somewhere that `force_forwarding` is used (and maybe link to the kernel docs).