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
284 The length of time an orphaned (no longer referenced by any
289 forever for the remote to close its end of the connection.
305 connection but that are invalid due to any of these reasons:
307 (a) out-of-window sequence number,
308 (b) out-of-window acknowledgment number, or
315 causing each side to send an unterminating stream of duplicate
318 Using 0 disables rate-limiting of dupacks in response to
336 will be aborted after ~11 minutes of retries.
342 An example of an application where this default should be
347 Maximal number of TCP sockets not attached to any user file handle,
356 up to ~64K of unswappable memory.
359 Maximal number of remembered connection requests, which have not
362 increase in proportion to the memory of machine.
366 Maximal number of timewait sockets held by system simultaneously.
373 tcp_mem - vector of 3 INTEGERs: min, pressure, max
374 min: below this number of pages TCP is not bothered about its
377 pressure: when amount of memory allocated by TCP exceeds this number
378 of pages, TCP moderates its memory consumption and enters memory
382 max: number of pages allowed for queueing by all TCP sockets.
384 Defaults are calculated at boot time from amount of available
388 The window length of the windowed min filter to track the minimum RTT.
406 2 - Always enabled, use initial MSS of tcp_base_mss.
415 will stop in respect to the width of search range in bytes. Default
427 This value influences the timeout of a locally closed TCP connection,
440 RACK: 0x1 enables the RACK loss detection for fast detection of lost
446 Initial reordering level of packets in a TCP stream.
452 Maximal reordering level of packets in a TCP stream.
472 This value influences the timeout of an alive TCP connection,
474 Given a value of N, a hypothetical TCP connection following
475 exponential backoff with an initial RTO of TCP_RTO_MIN would
478 The default value of 15 yields a hypothetical timeout of 924.6
484 which corresponds to a value of at least 8.
492 tcp_rmem - vector of 3 INTEGERs: min, default, max
493 min: Minimal size of receive buffer used by TCP sockets.
498 default: initial size of receive buffer used by TCP sockets.
500 Default: 87380 bytes. This value results in window of 65535 with
501 default setting of tcp_adv_win_scale and tcp_app_win:0 and a bit
504 max: maximal size of receive buffer allowed for automatically
507 automatic tuning of that socket's receive buffer size, in which
522 Use the Host requirements interpretation of the TCP urgent pointer field.
528 Number of times SYNACKs for a passive TCP connection attempt will
531 with the current initial RTO of 1second. With this the final timeout
536 Send out syncookies when the syn backlog queue of a socket
544 because of overload with legal connections, you should tune
550 of some services (f.e. SMTP relaying), visible not by you,
557 unconditionally generation of syncookies.
570 4: Send data in the opening SYN regardless of cookie availability and
574 0x400/0x800: Enable Fast Open on all listeners regardless of the
576 different ways of setting max_qlen without the TCP_FASTOPEN socket
582 respectively) must be also enabled before the rest of flags can take
588 Number of times initial SYNs for an active TCP connection attempt
591 with the current initial RTO of 1second. With this the final timeout
598 Minimal number of segments per TSO frame.
599 Since linux-3.12, TCP does an automatic sizing of TSO frames,
600 depending on flow rate, instead of filling 64Kbytes packets.
622 This allows control over what percentage of the congestion window
624 The setting of this parameter is a choice between burstiness and
630 It should not be changed without advice/request of technical
636 It should not be changed without advice/request of technical
642 tcp_wmem - vector of 3 INTEGERs: min, default, max
643 min: Amount of memory reserved for send buffers for TCP sockets.
644 Each TCP socket has rights to use it due to fact of its birth.
647 default: initial size of send buffer used by TCP sockets. This
652 max: Maximal amount of memory allowed for automatically tuned
655 automatic tuning of that socket's send buffer size, in which case
660 A TCP socket can control the amount of unsent bytes in its write queue,
662 reports POLLOUT events if the amount of unsent bytes is below a per
666 This global variable controls the amount of unsent data for
673 If set, assume no receipt of a window scaling option means the
680 Enable dynamic triggering of linear timeouts for thin streams.
692 Enable dynamic triggering of retransmissions after one dupACK
694 of a dupACK to determine if the stream is thin (less than 4
707 result in a large amount of packets queued in qdisc/device
708 on the local machine, hurting latency of other flows, for
710 tcp_limit_output_bytes limits the number of bytes on qdisc
715 Limits number of Challenge ACK sent per second, as recommended
721 udp_mem - vector of 3 INTEGERs: min, pressure, max
722 Number of pages allowed for queueing by all UDP sockets.
724 min: Below this number of pages UDP is not bothered about its
725 memory appetite. When amount of memory allocated by UDP exceeds
728 pressure: This value was introduced to follow format of tcp_mem.
730 max: Number of pages allowed for queueing by all UDP sockets.
732 Default is calculated at boot time from amount of available memory.
735 Minimal size of receive buffer used by UDP sockets in moderation.
737 total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
741 Minimal size of send buffer used by UDP sockets in moderation.
743 total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
751 miss. However, regardless of the setting the cache is still
757 The CIPSO label cache consists of a fixed size hash table with each
758 hash bucket containing a number of cache entries. This variable limits
759 the number of entries in each hash bucket; the larger the value the
760 more CIPSO label mappings that can be cached. When the number of
766 Enable the "Optimized Tag 1 Format" as defined in section 3.4.2.6 of
773 If set, do a very strict check of the CIPSO option when
791 ip_local_reserved_ports - list of comma separated ranges
798 list of ranges (e.g. "1,2-4,10-10" for ports 1, 2, 3, 4 and
836 certain kinds of local sockets. Currently we only do this
859 of ICMP packets sent on all targets.
863 Limit maximal number of ICMP packets sent per second from this host.
869 icmp_msgs_per_sec controls number of ICMP packets sent per second,
870 while icmp_msgs_burst controls the burst size of these packets.
874 Mask made of ICMP types for which rates are being limited.
904 If zero, icmp error messages are sent with the primary address of
907 If non-zero, the message will be sent with the primary address of
914 then the primary address of the first non-loopback interface that
915 has one will be used regardless of this setting.
920 Change the maximum number of multicast groups we can subscribe to.
928 The number of supported groups 'M' is bounded by the number of group
929 report entries you can fit into a single datagram of 65535 bytes.
933 Group records are variable length, with a minimum of 12 bytes.
942 "interface" is the name of your network interface)
953 log_martians for the interface will be enabled if at least one of
963 - at least one of conf/{all,interface}/accept_redirects is TRUE in the
981 the broadcast packets are received only on one of them.
983 to its medium, value of -1 means that medium is not known.
991 proxy_arp for the interface will be enabled if at least one of
1017 shared_media for the interface will be enabled if at least one of
1025 secure_redirects for the interface will be enabled if at least one of
1032 send_redirects for the interface will be enabled if at least one of
1061 while routing. This enables the use of 127/8 for local routing purposes.
1091 of which cards (usually 1) will respond to an arp request.
1095 sense, because it increases the chance of successful communication.
1100 arp_filter for the interface will be enabled if at least one of
1112 address in ARP requests to be part of their logical network
1154 Define mode for notification of address and device changes.
1168 If the ARP table already contains the IP address of the
1173 The maximum number of multicast probes in INCOMPLETE state,
1178 The maximum number of unicast probes in PROBE state, when
1182 The maximum number of probes to send to the user space ARP daemon
1187 The maximum number of multicast probes after unicast and
1208 promote a corresponding secondary IP address instead of
1220 limit (4096 * number of online cpus) to take effect.
1246 which restricts use of the IPv6 socket to IPv6 communication
1254 Protect the consistency (and unicity) of flow label.
1262 Automatically generate flow labels based on a flow hash of the
1285 Controls the use of anycast addresses as source addresses for ICMPv6
1298 Controls the number of retries to generate a stable privacy
1311 ip6frag_high_thresh bytes of memory is allocated for this purpose,
1345 Controls the fwmark of kernel-generated IPv6 reply packets that are not
1347 If unset, these packets have a fwmark of zero. If set, they have the
1348 fwmark of the packet they are replying to.
1407 Maximum prefix length of Route Information in RA.
1450 The amount of Duplicate Address Detection probes to send.
1507 Number of seconds to wait after interface is brought up
1512 Number of seconds to wait between Router Solicitations.
1516 Number of Router Solicitations to send until assuming no
1522 routed via this interface are restricted to the set of addresses
1553 Number of attempts before give up attempting to generate
1558 Maximum number of autoconfigured addresses per interface. Setting
1595 omitted since the sender of the solicitation has the correct link-
1603 Define mode for notification of address and device changes.
1619 0 - (default) No enforcement of a MLD version, MLDv1 fallback allowed
1624 Control RFC 6980 (Security Implications of IPv6 Fragmentation
1652 of a system and keep it stable after that.
1667 limit (4096 * number of online cpus) to take effect.
1705 This allows use of e.g. "iptables -i br0.1" and makes the REDIRECT
1706 target work with vlan-on-top-of-bridge interfaces. When no matching
1715 Enable or disable extension of Dynamic Address Reconfiguration
1727 Dynamic Address Reconfiguration (ADD-IP) requires the use of
1728 authentication to protect the operations of adding or removing new
1732 allowing the ADD-IP extension. For reasons of interoperability,
1733 we provide this variable to control the enforcement of the
1747 required for secure operation of Dynamic Address Reconfiguration
1765 The limit of the number of new packets that can be initially sent. It
1778 The maximum number of retransmissions of INIT and COOKIE-ECHO chunks
1785 The maximum number of retransmissions that will be attempted on a given
1793 The number of retransmissions that will be attempted on a given path
1801 for details. Note also that a value of pf_retrans > path_max_retrans
1814 The maximum value (in milliseconds) of the round trip timeout. This
1820 The minimum value (in milliseconds) of the round trip timeout. This
1827 are sent at the specified interval on idle paths to probe the state of
1833 The amount of time (in milliseconds) that the implementation will wait
1839 The default lifetime of the SCTP cookie (in milliseconds). The cookie
1845 Enable or disable the ability to extend the lifetime of the SCTP cookie
1846 that is used during the establishment phase of SCTP association
1861 configuration of those algorithms at build time (CONFIG_CRYPTO_MD5 and
1872 of data may block other associations from delivering their data by
1873 consuming all of the receive buffer space. To work around this,
1875 to each association instead of the socket. This prevents the described
1891 sctp_mem - vector of 3 INTEGERs: min, pressure, max
1892 Number of pages allowed for queueing by all SCTP sockets.
1894 min: Below this number of pages SCTP is not bothered about its
1895 memory appetite. When amount of memory allocated by SCTP exceeds
1898 pressure: This value was introduced to follow format of tcp_mem.
1900 max: Number of pages allowed for queueing by all SCTP sockets.
1902 Default is calculated at boot time from amount of available memory.
1904 sctp_rmem - vector of 3 INTEGERs: min, default, max
1908 min: Minimal size of receive buffer used by SCTP socket.
1914 sctp_wmem - vector of 3 INTEGERs: min, default, max
1929 Please see: Documentation/sysctl/net.txt for descriptions of these entries.
1934 The maximum length of dgram socket receive queue