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-rw-r--r--Documentation/networking/ip-sysctl.txt8
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 3c12d9a7ed00..8a984e994e61 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -16,8 +16,12 @@ ip_default_ttl - INTEGER
Default: 64 (as recommended by RFC1700)
ip_no_pmtu_disc - BOOLEAN
- Disable Path MTU Discovery.
- default FALSE
+ Disable Path MTU Discovery. If enabled and a
+ fragmentation-required ICMP is received, the PMTU to this
+ destination will be set to 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.
+ Default: FALSE
min_pmtu - INTEGER
default 552 - minimum discovered Path MTU