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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-12-14 05:13:45 +0100
committerDavid S. Miller <davem@davemloft.net>2013-12-18 16:58:20 -0500
commitcd174e67a6b312fce9bab502ba2b0583e11f537f (patch)
tree992dc562f0562abdf9d549c1d06725f001270570 /Documentation/networking
parent974eda11c54290a1be8f8b155edae7d791e5ce57 (diff)
ipv4: new ip_no_pmtu_disc mode to always discard incoming frag needed msgs
This new mode discards all incoming fragmentation-needed notifications as I guess was originally intended with this knob. To not break backward compatibility too much, I only added a special case for mode 2 in the receiving path. Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/ip-sysctl.txt10
1 files changed, 8 insertions, 2 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index f76d177895d9..d71afa8bd828 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -15,12 +15,18 @@ ip_default_ttl - INTEGER
forwarded) IP packets. Should be between 1 and 255 inclusive.
Default: 64 (as recommended by RFC1700)
-ip_no_pmtu_disc - BOOLEAN
- Disable Path MTU Discovery. If enabled and a
+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
to raise min_pmtu to the smallest interface MTU on your system
manually if you want to avoid locally generated fragments.
+
+ In mode 2 incoming Path MTU Discovery messages will be
+ discarded. Outgoing frames are handled the same as in mode 1,
+ implicitly setting IP_PMTUDISC_DONT on every created socket.
+
+ Possible values: 0-2
Default: FALSE
min_pmtu - INTEGER