UBUNTU: Ubuntu-4.15.0-96.97

[mirror_ubuntu-bionic-kernel.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 46c7e1085efcccc178a644917e5e80fa736781fd..b31d5ffb352f4619fc1b46623dc38384b5ef7cab 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -133,14 +133,11 @@ min_adv_mss - INTEGER
 
 IP Fragmentation:
 
-ipfrag_high_thresh - INTEGER
-       Maximum memory used to reassemble IP fragments. When
-       ipfrag_high_thresh bytes of memory is allocated for this purpose,
-       the fragment handler will toss packets until ipfrag_low_thresh
-       is reached. This also serves as a maximum limit to namespaces
-       different from the initial one.
-
-ipfrag_low_thresh - INTEGER
+ipfrag_high_thresh - LONG INTEGER
+       Maximum memory used to reassemble IP fragments.
+
+ipfrag_low_thresh - LONG INTEGER
+       (Obsolete since linux-4.17)
        Maximum memory used to reassemble IP fragments before the kernel
        begins to remove incomplete fragment queues to free up resources.
        The kernel still accepts new fragments for defragmentation.
@@ -244,6 +241,14 @@ tcp_base_mss - INTEGER
        Path MTU discovery (MTU probing).  If MTU probing is enabled,
        this is the initial MSS used by the connection.
 
+tcp_min_snd_mss - INTEGER
+       TCP SYN and SYNACK messages usually advertise an ADVMSS option,
+       as described in RFC 1122 and RFC 6691.
+       If this ADVMSS option is smaller than tcp_min_snd_mss,
+       it is silently capped to tcp_min_snd_mss.
+
+       Default : 48 (at least 8 bytes of payload per segment)
+
 tcp_congestion_control - STRING
        Set the congestion control algorithm to be used for new
        connections. The algorithm "reno" is always available, but
@@ -404,6 +409,7 @@ tcp_min_rtt_wlen - INTEGER
        minimum RTT when it is moved to a longer path (e.g., due to traffic
        engineering). A longer window makes the filter more resistant to RTT
        inflations such as transient congestion. The unit is seconds.
+       Possible values: 0 - 86400 (1 day)
        Default: 300
 
 tcp_moderate_rcvbuf - BOOLEAN
@@ -508,7 +514,7 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max
        min: Minimal size of receive buffer used by TCP sockets.
        It is guaranteed to each TCP socket, even under moderate memory
        pressure.
-       Default: 1 page
+       Default: 4K
 
        default: initial size of receive buffer used by TCP sockets.
        This value overrides net.core.rmem_default used by other protocols.
@@ -666,7 +672,7 @@ tcp_window_scaling - BOOLEAN
 tcp_wmem - vector of 3 INTEGERs: min, default, max
        min: Amount of memory reserved for send buffers for TCP sockets.
        Each TCP socket has rights to use it due to fact of its birth.
-       Default: 1 page
+       Default: 4K
 
        default: initial size of send buffer used by TCP sockets.  This
        value overrides net.core.wmem_default used by other protocols.
@@ -1385,26 +1391,26 @@ mld_qrv - INTEGER
        Default: 2 (as specified by RFC3810 9.1)
        Minimum: 1 (as specified by RFC6636 4.5)
 
-max_dst_opts_cnt - INTEGER
+max_dst_opts_number - INTEGER
        Maximum number of non-padding TLVs allowed in a Destination
        options extension header. If this value is less than zero
        then unknown options are disallowed and the number of known
        TLVs allowed is the absolute value of this number.
        Default: 8
 
-max_hbh_opts_cnt - INTEGER
+max_hbh_opts_number - INTEGER
        Maximum number of non-padding TLVs allowed in a Hop-by-Hop
        options extension header. If this value is less than zero
        then unknown options are disallowed and the number of known
        TLVs allowed is the absolute value of this number.
        Default: 8
 
-max dst_opts_len - INTEGER
+max_dst_opts_length - INTEGER
        Maximum length allowed for a Destination options extension
        header.
        Default: INT_MAX (unlimited)
 
-max hbh_opts_len - INTEGER
+max_hbh_length - INTEGER
        Maximum length allowed for a Hop-by-Hop options extension
        header.
        Default: INT_MAX (unlimited)