[pve-devel] [PATCH docs] Update SDN docs example to use sysctl.d over sysctl.conf.

[pve-devel] [PATCH docs] Update SDN docs example to use sysctl.d over sysctl.conf.

[Manuel Federanko]

Debian trixie does not read /etc/sysctl.conf anymore [1]

[1] https://www.debian.org/releases/trixie/release-notes/issues.html#etc-sysctl-conf-is-no-longer-honored

Suggested-by: Lukas Wagner <l.wagner@proxmox.com>
Signed-off-by: Manuel Federanko <m.federanko@proxmox.com>
---
 pvesdn.adoc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pvesdn.adoc b/pvesdn.adoc
index d20a0eb..f404f11 100644
--- a/pvesdn.adoc
+++ b/pvesdn.adoc
@@ -1408,7 +1408,7 @@ If you have multiple gateway nodes, you should disable the `rp_filter` (Strict
 Reverse Path Filter) option, because packets can arrive at one node but go out
 from another node.
 
-Add the following to `/etc/sysctl.conf`:
+Create a drop-in sysctl file `/etc/sysctl.d/99-rp-filter.conf`:
 
 -----
 net.ipv4.conf.default.rp_filter=0
-- 
2.47.3


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Re: [pve-devel] [PATCH docs] Update SDN docs example to use sysctl.d over sysctl.conf.

[Gabriel Goller]

On 27.01.2026 11:55, Manuel Federanko wrote:
> Debian trixie does not read /etc/sysctl.conf anymore [1]
> 
> [1] https://www.debian.org/releases/trixie/release-notes/issues.html#etc-sysctl-conf-is-no-longer-honored
> 
> Suggested-by: Lukas Wagner <l.wagner@proxmox.com>
> Signed-off-by: Manuel Federanko <m.federanko@proxmox.com>
> ---
>  pvesdn.adoc | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/pvesdn.adoc b/pvesdn.adoc
> index d20a0eb..f404f11 100644
> --- a/pvesdn.adoc
> +++ b/pvesdn.adoc
> @@ -1408,7 +1408,7 @@ If you have multiple gateway nodes, you should disable the `rp_filter` (Strict
>  Reverse Path Filter) option, because packets can arrive at one node but go out
>  from another node.
>  
> -Add the following to `/etc/sysctl.conf`:
> +Create a drop-in sysctl file `/etc/sysctl.d/99-rp-filter.conf`:
>  
>  -----
>  net.ipv4.conf.default.rp_filter=0
> -- 

Hmm maybe we should add "execute `systemctl restart systemd-sysctl` to
reload the configs" or something?
I know this wasn't included previously but maybe this would be nice.

Either way -- LGTM:

Reviewed-by: Gabriel Goller <g.goller@proxmox.com>



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Re: [pve-devel] [PATCH docs] Update SDN docs example to use sysctl.d over sysctl.conf.

[Gabriel Goller]

On 28.01.2026 11:34, Manuel Federanko wrote:
> > Hmm maybe we should add "execute `systemctl restart systemd-sysctl`
> > to reload the configs" or something?
> 
> We could add this to all occurences throughout the docs then, not just
> this one.

Yep, I agree. Maybe check if this is the correct way to do, I've also
seen people use `service procps start`. If in doubt, you can also ask
@Fabian.


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