[PATCH] doc/ip-sysctl: tcp_timestamps is per src-dst not connection

[PATCH] doc/ip-sysctl: tcp_timestamps is per src-dst not connection

[Jörg Sommer]

Since 28ee1b746f493b7c62347d714f58fbf4f70df4f0 (secure_seq: downgrade to
per-host timestamp offsets) the random offset for TCP timestamps is the same
for all connections between a same source and destination addresses; the
port does not matter.

Signed-off-by: Jörg Sommer <joerg@jo-so.de>
---
 Documentation/networking/ip-sysctl.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 6921d8594b84..0d74f8d8a79e 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -1071,7 +1071,7 @@ tcp_timestamps - INTEGER
 
 	- 0: Disabled.
 	- 1: Enable timestamps as defined in RFC1323 and use random offset for
-	  each connection rather than only using the current time.
+	  each pair (src-addr, dst-addr) rather than only using the current time.
 	- 2: Like 1, but without random offsets.
 
 	Default: 1
-- 
2.51.0

Re: [PATCH] doc/ip-sysctl: tcp_timestamps is per src-dst not connection

[Kuniyuki Iwashima]

From: "Jörg Sommer" <joerg@jo-so.de>
Date: Mon,  2 Mar 2026 22:13:10 +0100
> Since 28ee1b746f493b7c62347d714f58fbf4f70df4f0 (secure_seq: downgrade to
> per-host timestamp offsets) the random offset for TCP timestamps is the same
> for all connections between a same source and destination addresses; the
> port does not matter.

We are going to revert the commit and then this doc change
will be unnecessary.

https://lore.kernel.org/netdev/20260302205527.1982836-1-edumazet@google.com/


> 
> Signed-off-by: Jörg Sommer <joerg@jo-so.de>
> ---
>  Documentation/networking/ip-sysctl.rst | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
> index 6921d8594b84..0d74f8d8a79e 100644
> --- a/Documentation/networking/ip-sysctl.rst
> +++ b/Documentation/networking/ip-sysctl.rst
> @@ -1071,7 +1071,7 @@ tcp_timestamps - INTEGER
>  
>  	- 0: Disabled.
>  	- 1: Enable timestamps as defined in RFC1323 and use random offset for
> -	  each connection rather than only using the current time.
> +	  each pair (src-addr, dst-addr) rather than only using the current time.
>  	- 2: Like 1, but without random offsets.
>  
>  	Default: 1
> -- 
> 2.51.0