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Documentation: fix outdated interpretation of ip_no_pmtu_disc

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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 28d35bcdd3 ("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>
This commit is contained in:
xu xin 2021-12-30 03:28:56 +00:00 committed by David S. Miller
parent ccc0c9be75
commit be1c5b5322
1 changed files with 4 additions and 2 deletions
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6
Documentation/networking/ip-sysctl.rst
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@ -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