1 /proc/sys/net/ipv4/* Variables:
7 Forward Packets between interfaces.
9 This variable is special, its change resets all configuration
10 parameters to their default state (RFC1122 for hosts, RFC1812
13 ip_default_ttl - INTEGER
16 ip_no_pmtu_disc - BOOLEAN
17 Disable Path MTU Discovery.
21 default 562 - minimum discovered Path MTU
24 Time, in seconds, that cached PMTU information is kept.
27 The advertised MSS depends on the first hop route MTU, but will
28 never be lower than this setting.
32 ipfrag_high_thresh - INTEGER
33 Maximum memory used to reassemble IP fragments. When
34 ipfrag_high_thresh bytes of memory is allocated for this purpose,
35 the fragment handler will toss packets until ipfrag_low_thresh
38 ipfrag_low_thresh - INTEGER
39 See ipfrag_high_thresh
42 Time in seconds to keep an IP fragment in memory.
44 ipfrag_secret_interval - INTEGER
45 Regeneration interval (in seconds) of the hash secret (or lifetime
46 for the hash secret) for IP fragments.
51 inet_peer_threshold - INTEGER
52 The approximate size of the storage. Starting from this threshold
53 entries will be thrown aggressively. This threshold also determines
54 entries' time-to-live and time intervals between garbage collection
55 passes. More entries, less time-to-live, less GC interval.
57 inet_peer_minttl - INTEGER
58 Minimum time-to-live of entries. Should be enough to cover fragment
59 time-to-live on the reassembling side. This minimum time-to-live is
60 guaranteed if the pool size is less than inet_peer_threshold.
61 Measured in jiffies(1).
63 inet_peer_maxttl - INTEGER
64 Maximum time-to-live of entries. Unused entries will expire after
65 this period of time if there is no memory pressure on the pool (i.e.
66 when the number of entries in the pool is very small).
67 Measured in jiffies(1).
69 inet_peer_gc_mintime - INTEGER
70 Minimum interval between garbage collection passes. This interval is
71 in effect under high memory pressure on the pool.
72 Measured in jiffies(1).
74 inet_peer_gc_maxtime - INTEGER
75 Minimum interval between garbage collection passes. This interval is
76 in effect under low (or absent) memory pressure on the pool.
77 Measured in jiffies(1).
81 tcp_syn_retries - INTEGER
82 Number of times initial SYNs for an active TCP connection attempt
83 will be retransmitted. Should not be higher than 255. Default value
84 is 5, which corresponds to ~180seconds.
86 tcp_synack_retries - INTEGER
87 Number of times SYNACKs for a passive TCP connection attempt will
88 be retransmitted. Should not be higher than 255. Default value
89 is 5, which corresponds to ~180seconds.
91 tcp_keepalive_time - INTEGER
92 How often TCP sends out keepalive messages when keepalive is enabled.
95 tcp_keepalive_probes - INTEGER
96 How many keepalive probes TCP sends out, until it decides that the
97 connection is broken. Default value: 9.
99 tcp_keepalive_intvl - INTEGER
100 How frequently the probes are send out. Multiplied by
101 tcp_keepalive_probes it is time to kill not responding connection,
102 after probes started. Default value: 75sec i.e. connection
103 will be aborted after ~11 minutes of retries.
105 tcp_retries1 - INTEGER
106 How many times to retry before deciding that something is wrong
107 and it is necessary to report this suspicion to network layer.
108 Minimal RFC value is 3, it is default, which corresponds
109 to ~3sec-8min depending on RTO.
111 tcp_retries2 - INTEGER
112 How may times to retry before killing alive TCP connection.
113 RFC1122 says that the limit should be longer than 100 sec.
114 It is too small number. Default value 15 corresponds to ~13-30min
117 tcp_orphan_retries - INTEGER
118 How may times to retry before killing TCP connection, closed
119 by our side. Default value 7 corresponds to ~50sec-16min
120 depending on RTO. If you machine is loaded WEB server,
121 you should think about lowering this value, such sockets
122 may consume significant resources. Cf. tcp_max_orphans.
124 tcp_fin_timeout - INTEGER
125 Time to hold socket in state FIN-WAIT-2, if it was closed
126 by our side. Peer can be broken and never close its side,
127 or even died unexpectedly. Default value is 60sec.
128 Usual value used in 2.2 was 180 seconds, you may restore
129 it, but remember that if your machine is even underloaded WEB server,
130 you risk to overflow memory with kilotons of dead sockets,
131 FIN-WAIT-2 sockets are less dangerous than FIN-WAIT-1,
132 because they eat maximum 1.5K of memory, but they tend
133 to live longer. Cf. tcp_max_orphans.
135 tcp_max_tw_buckets - INTEGER
136 Maximal number of timewait sockets held by system simultaneously.
137 If this number is exceeded time-wait socket is immediately destroyed
138 and warning is printed. This limit exists only to prevent
139 simple DoS attacks, you _must_ not lower the limit artificially,
140 but rather increase it (probably, after increasing installed memory),
141 if network conditions require more than default value.
143 tcp_tw_recycle - BOOLEAN
144 Enable fast recycling TIME-WAIT sockets. Default value is 0.
145 It should not be changed without advice/request of technical
148 tcp_tw_reuse - BOOLEAN
149 Allow to reuse TIME-WAIT sockets for new connections when it is
150 safe from protocol viewpoint. Default value is 0.
151 It should not be changed without advice/request of technical
154 tcp_max_orphans - INTEGER
155 Maximal number of TCP sockets not attached to any user file handle,
156 held by system. If this number is exceeded orphaned connections are
157 reset immediately and warning is printed. This limit exists
158 only to prevent simple DoS attacks, you _must_ not rely on this
159 or lower the limit artificially, but rather increase it
160 (probably, after increasing installed memory),
161 if network conditions require more than default value,
162 and tune network services to linger and kill such states
163 more aggressively. Let me to remind again: each orphan eats
164 up to ~64K of unswappable memory.
166 tcp_abort_on_overflow - BOOLEAN
167 If listening service is too slow to accept new connections,
168 reset them. Default state is FALSE. It means that if overflow
169 occurred due to a burst, connection will recover. Enable this
170 option _only_ if you are really sure that listening daemon
171 cannot be tuned to accept connections faster. Enabling this
172 option can harm clients of your server.
174 tcp_syncookies - BOOLEAN
175 Only valid when the kernel was compiled with CONFIG_SYNCOOKIES
176 Send out syncookies when the syn backlog queue of a socket
177 overflows. This is to prevent against the common 'syn flood attack'
180 Note, that syncookies is fallback facility.
181 It MUST NOT be used to help highly loaded servers to stand
182 against legal connection rate. If you see synflood warnings
183 in your logs, but investigation shows that they occur
184 because of overload with legal connections, you should tune
185 another parameters until this warning disappear.
186 See: tcp_max_syn_backlog, tcp_synack_retries, tcp_abort_on_overflow.
188 syncookies seriously violate TCP protocol, do not allow
189 to use TCP extensions, can result in serious degradation
190 of some services (f.e. SMTP relaying), visible not by you,
191 but your clients and relays, contacting you. While you see
192 synflood warnings in logs not being really flooded, your server
193 is seriously misconfigured.
196 Use the Host requirements interpretation of the TCP urg pointer field.
197 Most hosts use the older BSD interpretation, so if you turn this on
198 Linux might not communicate correctly with them.
201 tcp_max_syn_backlog - INTEGER
202 Maximal number of remembered connection requests, which are
203 still did not receive an acknowledgment from connecting client.
204 Default value is 1024 for systems with more than 128Mb of memory,
205 and 128 for low memory machines. If server suffers of overload,
206 try to increase this number.
208 tcp_window_scaling - BOOLEAN
209 Enable window scaling as defined in RFC1323.
211 tcp_timestamps - BOOLEAN
212 Enable timestamps as defined in RFC1323.
215 Enable select acknowledgments (SACKS).
218 Enable FACK congestion avoidance and fast retransmission.
219 The value is not used, if tcp_sack is not enabled.
222 Allows TCP to send "duplicate" SACKs.
225 Enable Explicit Congestion Notification in TCP.
227 tcp_reordering - INTEGER
228 Maximal reordering of packets in a TCP stream.
231 tcp_retrans_collapse - BOOLEAN
232 Bug-to-bug compatibility with some broken printers.
233 On retransmit try to send bigger packets to work around bugs in
236 tcp_wmem - vector of 3 INTEGERs: min, default, max
237 min: Amount of memory reserved for send buffers for TCP socket.
238 Each TCP socket has rights to use it due to fact of its birth.
241 default: Amount of memory allowed for send buffers for TCP socket
242 by default. This value overrides net.core.wmem_default used
243 by other protocols, it is usually lower than net.core.wmem_default.
246 max: Maximal amount of memory allowed for automatically selected
247 send buffers for TCP socket. This value does not override
248 net.core.wmem_max, "static" selection via SO_SNDBUF does not use this.
251 tcp_rmem - vector of 3 INTEGERs: min, default, max
252 min: Minimal size of receive buffer used by TCP sockets.
253 It is guaranteed to each TCP socket, even under moderate memory
257 default: default size of receive buffer used by TCP sockets.
258 This value overrides net.core.rmem_default used by other protocols.
259 Default: 87380 bytes. This value results in window of 65535 with
260 default setting of tcp_adv_win_scale and tcp_app_win:0 and a bit
261 less for default tcp_app_win. See below about these variables.
263 max: maximal size of receive buffer allowed for automatically
264 selected receiver buffers for TCP socket. This value does not override
265 net.core.rmem_max, "static" selection via SO_RCVBUF does not use this.
266 Default: 87380*2 bytes.
268 tcp_mem - vector of 3 INTEGERs: min, pressure, max
269 low: below this number of pages TCP is not bothered about its
272 pressure: when amount of memory allocated by TCP exceeds this number
273 of pages, TCP moderates its memory consumption and enters memory
274 pressure mode, which is exited when memory consumption falls
277 high: number of pages allowed for queueing by all TCP sockets.
279 Defaults are calculated at boot time from amount of available
282 tcp_app_win - INTEGER
283 Reserve max(window/2^tcp_app_win, mss) of window for application
284 buffer. Value 0 is special, it means that nothing is reserved.
287 tcp_adv_win_scale - INTEGER
288 Count buffering overhead as bytes/2^tcp_adv_win_scale
289 (if tcp_adv_win_scale > 0) or bytes-bytes/2^(-tcp_adv_win_scale),
293 tcp_rfc1337 - BOOLEAN
294 If set, the TCP stack behaves conforming to RFC1337. If unset,
295 we are not conforming to RFC, but prevent TCP TIME_WAIT
299 tcp_low_latency - BOOLEAN
300 If set, the TCP stack makes decisions that prefer lower
301 latency as opposed to higher throughput. By default, this
302 option is not set meaning that higher throughput is preferred.
303 An example of an application where this default should be
304 changed would be a Beowulf compute cluster.
307 tcp_westwood - BOOLEAN
308 Enable TCP Westwood+ congestion control algorithm.
309 TCP Westwood+ is a sender-side only modification of the TCP Reno
310 protocol stack that optimizes the performance of TCP congestion
311 control. It is based on end-to-end bandwidth estimation to set
312 congestion window and slow start threshold after a congestion
313 episode. Using this estimation, TCP Westwood+ adaptively sets a
314 slow start threshold and a congestion window which takes into
315 account the bandwidth used at the time congestion is experienced.
316 TCP Westwood+ significantly increases fairness wrt TCP Reno in
317 wired networks and throughput over wireless links.
320 tcp_vegas_cong_avoid - BOOLEAN
321 Enable TCP Vegas congestion avoidance algorithm.
322 TCP Vegas is a sender-side only change to TCP that anticipates
323 the onset of congestion by estimating the bandwidth. TCP Vegas
324 adjusts the sending rate by modifying the congestion
325 window. TCP Vegas should provide less packet loss, but it is
326 not as aggressive as TCP Reno.
330 Enable BIC TCP congestion control algorithm.
331 BIC-TCP is a sender-side only change that ensures a linear RTT
332 fairness under large windows while offering both scalability and
333 bounded TCP-friendliness. The protocol combines two schemes
334 called additive increase and binary search increase. When the
335 congestion window is large, additive increase with a large
336 increment ensures linear RTT fairness as well as good
337 scalability. Under small congestion windows, binary search
338 increase provides TCP friendliness.
341 tcp_bic_low_window - INTEGER
342 Sets the threshold window (in packets) where BIC TCP starts to
343 adjust the congestion window. Below this threshold BIC TCP behaves
344 the same as the default TCP Reno.
347 tcp_bic_fast_convergence - BOOLEAN
348 Forces BIC TCP to more quickly respond to changes in congestion
349 window. Allows two flows sharing the same connection to converge
353 tcp_default_win_scale - INTEGER
354 Sets the minimum window scale TCP will negotiate for on all
360 Enables F-RTO, an enhanced recovery algorithm for TCP retransmission
361 timeouts. It is particularly beneficial in wireless environments
362 where packet loss is typically due to random radio interference
363 rather than intermediate router congestion.
366 Limit of socket listen() backlog, known in userspace as SOMAXCONN.
367 Defaults to 128. See also tcp_max_syn_backlog for additional tuning
372 ip_local_port_range - 2 INTEGERS
373 Defines the local port range that is used by TCP and UDP to
374 choose the local port. The first number is the first, the
375 second the last local port number. Default value depends on
376 amount of memory available on the system:
378 < 128Mb 1024-4999 or even less.
379 This number defines number of active connections, which this
380 system can issue simultaneously to systems not supporting
381 TCP extensions (timestamps). With tcp_tw_recycle enabled
382 (i.e. by default) range 1024-4999 is enough to issue up to
383 2000 connections per second to systems supporting timestamps.
385 ip_nonlocal_bind - BOOLEAN
386 If set, allows processes to bind() to non-local IP addresses,
387 which can be quite useful - but may break some applications.
391 If set non-zero, enables support for dynamic addresses.
392 If set to a non-zero value larger than 1, a kernel log
393 message will be printed when dynamic address rewriting
397 icmp_echo_ignore_all - BOOLEAN
398 icmp_echo_ignore_broadcasts - BOOLEAN
399 If either is set to true, then the kernel will ignore either all
400 ICMP ECHO requests sent to it or just those to broadcast/multicast
401 addresses, respectively.
403 icmp_ratelimit - INTEGER
404 Limit the maximal rates for sending ICMP packets whose type matches
405 icmp_ratemask (see below) to specific targets.
406 0 to disable any limiting, otherwise the maximal rate in jiffies(1)
409 icmp_ratemask - INTEGER
410 Mask made of ICMP types for which rates are being limited.
411 Significant bits: IHGFEDCBA9876543210
412 Default mask: 0000001100000011000 (6168)
414 Bit definitions (see include/linux/icmp.h):
416 3 Destination Unreachable *
421 C Parameter Problem *
426 H Address Mask Request
429 * These are rate limited by default (see default mask above)
431 icmp_ignore_bogus_error_responses - BOOLEAN
432 Some routers violate RFC1122 by sending bogus responses to broadcast
433 frames. Such violations are normally logged via a kernel warning.
434 If this is set to TRUE, the kernel will not give such warnings, which
435 will avoid log file clutter.
438 igmp_max_memberships - INTEGER
439 Change the maximum number of multicast groups we can subscribe to.
442 conf/interface/* changes special settings per interface (where "interface" is
443 the name of your network interface)
444 conf/all/* is special, changes the settings for all interfaces
447 log_martians - BOOLEAN
448 Log packets with impossible addresses to kernel log.
449 log_martians for the interface will be enabled if at least one of
450 conf/{all,interface}/log_martians is set to TRUE,
451 it will be disabled otherwise
453 accept_redirects - BOOLEAN
454 Accept ICMP redirect messages.
455 accept_redirects for the interface will be enabled if:
456 - both conf/{all,interface}/accept_redirects are TRUE in the case forwarding
457 for the interface is enabled
459 - at least one of conf/{all,interface}/accept_redirects is TRUE in the case
460 forwarding for the interface is disabled
461 accept_redirects for the interface will be disabled otherwise
466 Enable IP forwarding on this interface.
468 mc_forwarding - BOOLEAN
469 Do multicast routing. The kernel needs to be compiled with CONFIG_MROUTE
470 and a multicast routing daemon is required.
471 conf/all/mc_forwarding must also be set to TRUE to enable multicast routing
475 Integer value used to differentiate the devices by the medium they
476 are attached to. Two devices can have different id values when
477 the broadcast packets are received only on one of them.
478 The default value 0 means that the device is the only interface
479 to its medium, value of -1 means that medium is not known.
481 Currently, it is used to change the proxy_arp behavior:
482 the proxy_arp feature is enabled for packets forwarded between
483 two devices attached to different media.
487 proxy_arp for the interface will be enabled if at least one of
488 conf/{all,interface}/proxy_arp is set to TRUE,
489 it will be disabled otherwise
491 shared_media - BOOLEAN
492 Send(router) or accept(host) RFC1620 shared media redirects.
493 Overrides ip_secure_redirects.
494 shared_media for the interface will be enabled if at least one of
495 conf/{all,interface}/shared_media is set to TRUE,
496 it will be disabled otherwise
499 secure_redirects - BOOLEAN
500 Accept ICMP redirect messages only for gateways,
501 listed in default gateway list.
502 secure_redirects for the interface will be enabled if at least one of
503 conf/{all,interface}/secure_redirects is set to TRUE,
504 it will be disabled otherwise
507 send_redirects - BOOLEAN
508 Send redirects, if router.
509 send_redirects for the interface will be enabled if at least one of
510 conf/{all,interface}/send_redirects is set to TRUE,
511 it will be disabled otherwise
514 bootp_relay - BOOLEAN
515 Accept packets with source address 0.b.c.d destined
516 not to this host as local ones. It is supposed, that
517 BOOTP relay daemon will catch and forward such packets.
518 conf/all/bootp_relay must also be set to TRUE to enable BOOTP relay
523 accept_source_route - BOOLEAN
524 Accept packets with SRR option.
525 conf/all/accept_source_route must also be set to TRUE to accept packets
526 with SRR option on the interface
527 default TRUE (router)
531 1 - do source validation by reversed path, as specified in RFC1812
532 Recommended option for single homed hosts and stub network
533 routers. Could cause troubles for complicated (not loop free)
534 networks running a slow unreliable protocol (sort of RIP),
535 or using static routes.
537 0 - No source validation.
539 conf/all/rp_filter must also be set to TRUE to do source validation
542 Default value is 0. Note that some distributions enable it
546 1 - Allows you to have multiple network interfaces on the same
547 subnet, and have the ARPs for each interface be answered
548 based on whether or not the kernel would route a packet from
549 the ARP'd IP out that interface (therefore you must use source
550 based routing for this to work). In other words it allows control
551 of which cards (usually 1) will respond to an arp request.
553 0 - (default) The kernel can respond to arp requests with addresses
554 from other interfaces. This may seem wrong but it usually makes
555 sense, because it increases the chance of successful communication.
556 IP addresses are owned by the complete host on Linux, not by
557 particular interfaces. Only for more complex setups like load-
558 balancing, does this behaviour cause problems.
560 arp_filter for the interface will be enabled if at least one of
561 conf/{all,interface}/arp_filter is set to TRUE,
562 it will be disabled otherwise
564 arp_announce - INTEGER
565 Define different restriction levels for announcing the local
566 source IP address from IP packets in ARP requests sent on
568 0 - (default) Use any local address, configured on any interface
569 1 - Try to avoid local addresses that are not in the target's
570 subnet for this interface. This mode is useful when target
571 hosts reachable via this interface require the source IP
572 address in ARP requests to be part of their logical network
573 configured on the receiving interface. When we generate the
574 request we will check all our subnets that include the
575 target IP and will preserve the source address if it is from
576 such subnet. If there is no such subnet we select source
577 address according to the rules for level 2.
578 2 - Always use the best local address for this target.
579 In this mode we ignore the source address in the IP packet
580 and try to select local address that we prefer for talks with
581 the target host. Such local address is selected by looking
582 for primary IP addresses on all our subnets on the outgoing
583 interface that include the target IP address. If no suitable
584 local address is found we select the first local address
585 we have on the outgoing interface or on all other interfaces,
586 with the hope we will receive reply for our request and
587 even sometimes no matter the source IP address we announce.
589 The max value from conf/{all,interface}/arp_announce is used.
591 Increasing the restriction level gives more chance for
592 receiving answer from the resolved target while decreasing
593 the level announces more valid sender's information.
596 Define different modes for sending replies in response to
597 received ARP requests that resolve local target IP addresses:
598 0 - (default): reply for any local target IP address, configured
600 1 - reply only if the target IP address is local address
601 configured on the incoming interface
602 2 - reply only if the target IP address is local address
603 configured on the incoming interface and both with the
604 sender's IP address are part from same subnet on this interface
605 3 - do not reply for local addresses configured with scope host,
606 only resolutions for global and link addresses are replied
608 8 - do not reply for all local addresses
610 The max value from conf/{all,interface}/arp_ignore is used
611 when ARP request is received on the {interface}
613 app_solicit - INTEGER
614 The maximum number of probes to send to the user space ARP daemon
615 via netlink before dropping back to multicast probes (see
616 mcast_solicit). Defaults to 0.
618 disable_policy - BOOLEAN
619 Disable IPSEC policy (SPD) for this interface
621 disable_xfrm - BOOLEAN
622 Disable IPSEC encryption on this interface, whatever the policy
627 Allows you to write a number, which can be used as required.
630 (1) Jiffie: internal timeunit for the kernel. On the i386 1/100s, on the
631 Alpha 1/1024s. See the HZ define in /usr/include/asm/param.h for the exact
632 value on your system.
641 delon.nicolas@wanadoo.fr
646 /proc/sys/net/ipv6/* Variables:
648 IPv6 has no global variables such as tcp_*. tcp_* settings under ipv4/ also
649 apply to IPv6 [XXX?].
652 Default value for IPV6_V6ONLY socket option,
653 which restricts use of the IPv6 socket to IPv6 communication
655 TRUE: disable IPv4-mapped address feature
656 FALSE: enable IPv4-mapped address feature
658 Default: FALSE (as specified in RFC2553bis)
662 ip6frag_high_thresh - INTEGER
663 Maximum memory used to reassemble IPv6 fragments. When
664 ip6frag_high_thresh bytes of memory is allocated for this purpose,
665 the fragment handler will toss packets until ip6frag_low_thresh
668 ip6frag_low_thresh - INTEGER
669 See ip6frag_high_thresh
671 ip6frag_time - INTEGER
672 Time in seconds to keep an IPv6 fragment in memory.
674 ip6frag_secret_interval - INTEGER
675 Regeneration interval (in seconds) of the hash secret (or lifetime
676 for the hash secret) for IPv6 fragments.
680 Change the interface-specific default settings.
684 Change all the interface-specific settings.
686 [XXX: Other special features than forwarding?]
688 conf/all/forwarding - BOOLEAN
689 Enable global IPv6 forwarding between all interfaces.
691 IPv4 and IPv6 work differently here; e.g. netfilter must be used
692 to control which interfaces may forward packets and which not.
694 This also sets all interfaces' Host/Router setting
695 'forwarding' to the specified value. See below for details.
697 This referred to as global forwarding.
700 Change special settings per interface.
702 The functional behaviour for certain settings is different
703 depending on whether local forwarding is enabled or not.
706 Accept Router Advertisements; autoconfigure using them.
708 Functional default: enabled if local forwarding is disabled.
709 disabled if local forwarding is enabled.
711 accept_redirects - BOOLEAN
714 Functional default: enabled if local forwarding is disabled.
715 disabled if local forwarding is enabled.
718 Autoconfigure addresses using Prefix Information in Router
721 Functional default: enabled if accept_ra is enabled.
722 disabled if accept_ra is disabled.
724 dad_transmits - INTEGER
725 The amount of Duplicate Address Detection probes to send.
729 Configure interface-specific Host/Router behaviour.
731 Note: It is recommended to have the same setting on all
732 interfaces; mixed router/host scenarios are rather uncommon.
736 By default, Host behaviour is assumed. This means:
738 1. IsRouter flag is not set in Neighbour Advertisements.
739 2. Router Solicitations are being sent when necessary.
740 3. If accept_ra is TRUE (default), accept Router
741 Advertisements (and do autoconfiguration).
742 4. If accept_redirects is TRUE (default), accept Redirects.
746 If local forwarding is enabled, Router behaviour is assumed.
747 This means exactly the reverse from the above:
749 1. IsRouter flag is set in Neighbour Advertisements.
750 2. Router Solicitations are not sent.
751 3. Router Advertisements are ignored.
752 4. Redirects are ignored.
754 Default: FALSE if global forwarding is disabled (default),
758 Default Hop Limit to set.
762 Default Maximum Transfer Unit
763 Default: 1280 (IPv6 required minimum)
765 router_solicitation_delay - INTEGER
766 Number of seconds to wait after interface is brought up
767 before sending Router Solicitations.
770 router_solicitation_interval - INTEGER
771 Number of seconds to wait between Router Solicitations.
774 router_solicitations - INTEGER
775 Number of Router Solicitations to send until assuming no
779 use_tempaddr - INTEGER
780 Preference for Privacy Extensions (RFC3041).
781 <= 0 : disable Privacy Extensions
782 == 1 : enable Privacy Extensions, but prefer public
783 addresses over temporary addresses.
784 > 1 : enable Privacy Extensions and prefer temporary
785 addresses over public addresses.
786 Default: 0 (for most devices)
787 -1 (for point-to-point devices and loopback devices)
789 temp_valid_lft - INTEGER
790 valid lifetime (in seconds) for temporary addresses.
791 Default: 604800 (7 days)
793 temp_prefered_lft - INTEGER
794 Preferred lifetime (in seconds) for temporary addresses.
795 Default: 86400 (1 day)
797 max_desync_factor - INTEGER
798 Maximum value for DESYNC_FACTOR, which is a random value
799 that ensures that clients don't synchronize with each
800 other and generate new addresses at exactly the same time.
804 regen_max_retry - INTEGER
805 Number of attempts before give up attempting to generate
806 valid temporary addresses.
809 max_addresses - INTEGER
810 Number of maximum addresses per interface. 0 disables limitation.
811 It is recommended not set too large value (or 0) because it would
812 be too easy way to crash kernel to allow to create too much of
813 autoconfigured addresses.
818 Limit the maximal rates for sending ICMPv6 packets.
819 0 to disable any limiting, otherwise the maximal rate in jiffies(1)
824 Pekka Savola <pekkas@netcore.fi>
825 YOSHIFUJI Hideaki / USAGI Project <yoshfuji@linux-ipv6.org>
828 /proc/sys/net/bridge/* Variables:
830 bridge-nf-call-arptables - BOOLEAN
831 1 : pass bridged ARP traffic to arptables' FORWARD chain.
835 bridge-nf-call-iptables - BOOLEAN
836 1 : pass bridged IPv4 traffic to iptables' chains.
840 bridge-nf-call-ip6tables - BOOLEAN
841 1 : pass bridged IPv6 traffic to ip6tables' chains.
845 bridge-nf-filter-vlan-tagged - BOOLEAN
846 1 : pass bridged vlan-tagged ARP/IP traffic to arptables/iptables.
854 discovery_slots FIXME
855 discovery_timeout FIXME
856 fast_poll_increase FIXME
857 ip6_queue_maxlen FIXME
858 lap_keepalive_time FIXME
862 max_noreply_time FIXME
863 max_tx_data_size FIXME
865 min_tx_turn_time FIXME
870 warn_noreply_time FIXME
872 $Id: ip-sysctl.txt,v 1.20 2001/12/13 09:00:18 davem Exp $