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| author | xu xin <xu.xin16@zte.com.cn> | 2021-12-30 04:28:56 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-12-30 14:28:04 +0100 |
| commit | be1c5b53227ba8280f1ebb01c6f5da3c9eebdaad (patch) | |
| tree | 950702710e8c58a71e859d0110c5408b359d94ca /Documentation/networking | |
| parent | Merge tag 'mlx5-fixes-2021-12-28' of git://git.kernel.org/pub/scm/linux/kerne... (diff) | |
| download | linux-be1c5b53227ba8280f1ebb01c6f5da3c9eebdaad.tar.xz linux-be1c5b53227ba8280f1ebb01c6f5da3c9eebdaad.zip | |
Documentation: fix outdated interpretation of ip_no_pmtu_disc
The updating way of pmtu has changed, but documentation is still in the
old way. So this patch updates the interpretation of ip_no_pmtu_disc and
min_pmtu.
See commit 28d35bcdd3925 ("net: ipv4: don't let PMTU updates increase
route MTU")
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/ip-sysctl.rst | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index c04431144f7a..2572eecc3e86 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -25,7 +25,8 @@ ip_default_ttl - INTEGER ip_no_pmtu_disc - INTEGER Disable Path MTU Discovery. If enabled in mode 1 and a fragmentation-required ICMP is received, the PMTU to this - destination will be set to min_pmtu (see below). You will need + destination will be set to the smallest of the old MTU to + this destination and min_pmtu (see below). You will need to raise min_pmtu to the smallest interface MTU on your system manually if you want to avoid locally generated fragments. @@ -49,7 +50,8 @@ ip_no_pmtu_disc - INTEGER Default: FALSE min_pmtu - INTEGER - default 552 - minimum discovered Path MTU + default 552 - minimum Path MTU. Unless this is changed mannually, + each cached pmtu will never be lower than this setting. ip_forward_use_pmtu - BOOLEAN By default we don't trust protocol path MTUs while forwarding |