Lines Matching refs:of
14 Default value of TTL field (Time To Live) for outgoing (but not
36 TCP path mtu must still work but path MTU information of other
60 Controls the fwmark of kernel-generated IPv4 reply packets that are not
62 If unset, these packets have a fwmark of zero. If set, they have the
63 fwmark of the packet they are replying to.
67 Maximum number of routes allowed in the kernel. Increase
68 this when using large numbers of interfaces and/or routes.
73 Minimum number of entries to keep. Garbage collector will not
84 Maximum number of neighbor entries allowed. Increase this
85 when using large numbers of interfaces and when communicating
86 with large numbers of directly-connected peers.
90 The maximum number of bytes which may be used by packets
97 The maximum number of packets which may be queued for each
102 according to default value of unres_qlen_bytes and true size of
117 ipfrag_high_thresh bytes of memory is allocated for this purpose,
133 common IP source address. Note that reordering of packets is
134 not unusual, but if a large number of fragments arrive from a source
143 started. An ipfrag_max_dist value of zero disables this check.
147 reordering of packets occurs, which could lead to poor application
149 likelihood of incorrectly reassembling IP fragments that originate
156 The approximate size of the storage. Starting from this threshold
162 Minimum time-to-live of entries. Should be enough to cover fragment
168 Maximum time-to-live of entries. Unused entries will expire after
169 this period of time if there is no memory pressure on the pool (i.e.
170 when the number of entries in the pool is very small).
176 Limit of socket listen() backlog, known in userspace as SOMAXCONN.
186 option can harm clients of your server.
197 processes. The list is a subset of those listed in
202 Reserve max(window/2^tcp_app_win, mss) of window for application
210 total amount of sent packets. This is done if at least one prior
222 The initial value of search_low to be used by the packetization layer
230 Default is set as part of kernel configuration.
240 for triggering fast retransmit when the amount of outstanding data is
242 that limited transmit could be used). Also controls the use of
249 by a fourth of RTT. This mitigates connection falsely
250 recovers when network has a small degree of reordering
257 Control use of Explicit Congestion Notification (ECN) by TCP.
258 ECN is used only when both ends of the TCP connection indicate
275 The length of time an orphaned (no longer referenced by any
280 forever for the remote to close its end of the connection.
296 connection but that are invalid due to any of these reasons:
298 (a) out-of-window sequence number,
299 (b) out-of-window acknowledgment number, or
306 causing each side to send an unterminating stream of duplicate
309 Using 0 disables rate-limiting of dupacks in response to
327 will be aborted after ~11 minutes of retries.
333 An example of an application where this default should be
338 Maximal number of TCP sockets not attached to any user file handle,
347 up to ~64K of unswappable memory.
350 Maximal number of remembered connection requests, which have not
353 increase in proportion to the memory of machine.
357 Maximal number of timewait sockets held by system simultaneously.
364 tcp_mem - vector of 3 INTEGERs: min, pressure, max
365 min: below this number of pages TCP is not bothered about its
368 pressure: when amount of memory allocated by TCP exceeds this number
369 of pages, TCP moderates its memory consumption and enters memory
373 max: number of pages allowed for queueing by all TCP sockets.
375 Defaults are calculated at boot time from amount of available
389 2 - Always enabled, use initial MSS of tcp_base_mss.
398 will stop in respect to the width of search range in bytes. Default
410 This value influences the timeout of a locally closed TCP connection,
420 Initial reordering level of packets in a TCP stream.
426 Maximal reordering level of packets in a TCP stream.
446 This value influences the timeout of an alive TCP connection,
448 Given a value of N, a hypothetical TCP connection following
449 exponential backoff with an initial RTO of TCP_RTO_MIN would
452 The default value of 15 yields a hypothetical timeout of 924.6
458 which corresponds to a value of at least 8.
466 tcp_rmem - vector of 3 INTEGERs: min, default, max
467 min: Minimal size of receive buffer used by TCP sockets.
472 default: initial size of receive buffer used by TCP sockets.
474 Default: 87380 bytes. This value results in window of 65535 with
475 default setting of tcp_adv_win_scale and tcp_app_win:0 and a bit
478 max: maximal size of receive buffer allowed for automatically
481 automatic tuning of that socket's receive buffer size, in which
496 Use the Host requirements interpretation of the TCP urgent pointer field.
502 Number of times SYNACKs for a passive TCP connection attempt will
505 with the current initial RTO of 1second. With this the final timeout
510 Send out syncookies when the syn backlog queue of a socket
518 because of overload with legal connections, you should tune
524 of some services (f.e. SMTP relaying), visible not by you,
531 unconditionally generation of syncookies.
544 4: Send data in the opening SYN regardless of cookie availability and
548 0x400/0x800: Enable Fast Open on all listeners regardless of the
550 different ways of setting max_qlen without the TCP_FASTOPEN socket
556 respectively) must be also enabled before the rest of flags can take
562 Number of times initial SYNs for an active TCP connection attempt
565 with the current initial RTO of 1second. With this the final timeout
572 Minimal number of segments per TSO frame.
573 Since linux-3.12, TCP does an automatic sizing of TSO frames,
574 depending on flow rate, instead of filling 64Kbytes packets.
581 This allows control over what percentage of the congestion window
583 The setting of this parameter is a choice between burstiness and
589 It should not be changed without advice/request of technical
595 It should not be changed without advice/request of technical
601 tcp_wmem - vector of 3 INTEGERs: min, default, max
602 min: Amount of memory reserved for send buffers for TCP sockets.
603 Each TCP socket has rights to use it due to fact of its birth.
606 default: initial size of send buffer used by TCP sockets. This
611 max: Maximal amount of memory allowed for automatically tuned
614 automatic tuning of that socket's send buffer size, in which case
619 A TCP socket can control the amount of unsent bytes in its write queue,
621 reports POLLOUT events if the amount of unsent bytes is below a per
625 This global variable controls the amount of unsent data for
632 If set, assume no receipt of a window scaling option means the
639 Enable dynamic triggering of linear timeouts for thin streams.
651 Enable dynamic triggering of retransmissions after one dupACK
653 of a dupACK to determine if the stream is thin (less than 4
666 result in a large amount of packets queued in qdisc/device
667 on the local machine, hurting latency of other flows, for
669 tcp_limit_output_bytes limits the number of bytes on qdisc
674 Limits number of Challenge ACK sent per second, as recommended
680 udp_mem - vector of 3 INTEGERs: min, pressure, max
681 Number of pages allowed for queueing by all UDP sockets.
683 min: Below this number of pages UDP is not bothered about its
684 memory appetite. When amount of memory allocated by UDP exceeds
687 pressure: This value was introduced to follow format of tcp_mem.
689 max: Number of pages allowed for queueing by all UDP sockets.
691 Default is calculated at boot time from amount of available memory.
694 Minimal size of receive buffer used by UDP sockets in moderation.
696 total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
700 Minimal size of send buffer used by UDP sockets in moderation.
702 total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
710 miss. However, regardless of the setting the cache is still
716 The CIPSO label cache consists of a fixed size hash table with each
717 hash bucket containing a number of cache entries. This variable limits
718 the number of entries in each hash bucket; the larger the value the
719 more CIPSO label mappings that can be cached. When the number of
725 Enable the "Optimized Tag 1 Format" as defined in section 3.4.2.6 of
732 If set, do a very strict check of the CIPSO option when
748 ip_local_reserved_ports - list of comma separated ranges
755 list of ranges (e.g. "1,2-4,10-10" for ports 1, 2, 3, 4 and
793 certain kinds of local sockets. Currently we only do this
816 of ICMP packets sent on all targets.
820 Limit maximal number of ICMP packets sent per second from this host.
826 icmp_msgs_per_sec controls number of ICMP packets sent per second,
827 while icmp_msgs_burst controls the burst size of these packets.
831 Mask made of ICMP types for which rates are being limited.
861 If zero, icmp error messages are sent with the primary address of
864 If non-zero, the message will be sent with the primary address of
871 then the primary address of the first non-loopback interface that
872 has one will be used regardless of this setting.
877 Change the maximum number of multicast groups we can subscribe to.
885 The number of supported groups 'M' is bounded by the number of group
886 report entries you can fit into a single datagram of 65535 bytes.
890 Group records are variable length, with a minimum of 12 bytes.
899 "interface" is the name of your network interface)
910 log_martians for the interface will be enabled if at least one of
920 - at least one of conf/{all,interface}/accept_redirects is TRUE in the
938 the broadcast packets are received only on one of them.
940 to its medium, value of -1 means that medium is not known.
948 proxy_arp for the interface will be enabled if at least one of
974 shared_media for the interface will be enabled if at least one of
982 secure_redirects for the interface will be enabled if at least one of
989 send_redirects for the interface will be enabled if at least one of
1018 while routing. This enables the use of 127/8 for local routing purposes.
1048 of which cards (usually 1) will respond to an arp request.
1052 sense, because it increases the chance of successful communication.
1057 arp_filter for the interface will be enabled if at least one of
1069 address in ARP requests to be part of their logical network
1111 Define mode for notification of address and device changes.
1125 If the ARP table already contains the IP address of the
1130 The maximum number of multicast probes in INCOMPLETE state,
1135 The maximum number of unicast probes in PROBE state, when
1139 The maximum number of probes to send to the user space ARP daemon
1144 The maximum number of multicast probes after unicast and
1165 promote a corresponding secondary IP address instead of
1192 which restricts use of the IPv6 socket to IPv6 communication
1200 Protect the consistency (and unicity) of flow label.
1209 of the packet. This allows intermediate devices, such as routers,
1217 Controls the use of anycast addresses as source addresses for ICMPv6
1230 Controls the number of retries to generate a stable privacy
1243 ip6frag_high_thresh bytes of memory is allocated for this purpose,
1277 Controls the fwmark of kernel-generated IPv6 reply packets that are not
1279 If unset, these packets have a fwmark of zero. If set, they have the
1280 fwmark of the packet they are replying to.
1339 Maximum prefix length of Route Information in RA.
1382 The amount of Duplicate Address Detection probes to send.
1434 Number of seconds to wait after interface is brought up
1439 Number of seconds to wait between Router Solicitations.
1443 Number of Router Solicitations to send until assuming no
1473 Number of attempts before give up attempting to generate
1478 Maximum number of autoconfigured addresses per interface. Setting
1515 omitted since the sender of the solicitation has the correct link-
1523 Define mode for notification of address and device changes.
1539 0 - (default) No enforcement of a MLD version, MLDv1 fallback allowed
1544 Control RFC 6980 (Security Implications of IPv6 Fragmentation
1572 of a system and keep it stable after that.
1619 This allows use of e.g. "iptables -i br0.1" and makes the REDIRECT
1620 target work with vlan-on-top-of-bridge interfaces. When no matching
1629 Enable or disable extension of Dynamic Address Reconfiguration
1641 Dynamic Address Reconfiguration (ADD-IP) requires the use of
1642 authentication to protect the operations of adding or removing new
1646 allowing the ADD-IP extension. For reasons of interoperability,
1647 we provide this variable to control the enforcement of the
1661 required for secure operation of Dynamic Address Reconfiguration
1679 The limit of the number of new packets that can be initially sent. It
1692 The maximum number of retransmissions of INIT and COOKIE-ECHO chunks
1699 The maximum number of retransmissions that will be attempted on a given
1707 The number of retransmissions that will be attempted on a given path
1715 for details. Note also that a value of pf_retrans > path_max_retrans
1728 The maximum value (in milliseconds) of the round trip timeout. This
1734 The minimum value (in milliseconds) of the round trip timeout. This
1741 are sent at the specified interval on idle paths to probe the state of
1747 The amount of time (in milliseconds) that the implementation will wait
1753 The default lifetime of the SCTP cookie (in milliseconds). The cookie
1759 Enable or disable the ability to extend the lifetime of the SCTP cookie
1760 that is used during the establishment phase of SCTP association
1775 configuration of those algorithms at build time (CONFIG_CRYPTO_MD5 and
1786 of data may block other associations from delivering their data by
1787 consuming all of the receive buffer space. To work around this,
1789 to each association instead of the socket. This prevents the described
1805 sctp_mem - vector of 3 INTEGERs: min, pressure, max
1806 Number of pages allowed for queueing by all SCTP sockets.
1808 min: Below this number of pages SCTP is not bothered about its
1809 memory appetite. When amount of memory allocated by SCTP exceeds
1812 pressure: This value was introduced to follow format of tcp_mem.
1814 max: Number of pages allowed for queueing by all SCTP sockets.
1816 Default is calculated at boot time from amount of available memory.
1818 sctp_rmem - vector of 3 INTEGERs: min, default, max
1822 min: Minimal size of receive buffer used by SCTP socket.
1828 sctp_wmem - vector of 3 INTEGERs: min, default, max
1843 Please see: Documentation/sysctl/net.txt for descriptions of these entries.
1848 The maximum length of dgram socket receive queue