2 # IP netfilter configuration
5 menu "IP: Netfilter Configuration"
6 depends on INET && NETFILTER
8 # connection tracking, helpers and protocols
10 tristate "Connection tracking (required for masq/NAT)"
12 Connection tracking keeps a record of what packets have passed
13 through your machine, in order to figure out how they are related
16 This is required to do Masquerading or other kinds of Network
17 Address Translation (except for Fast NAT). It can also be used to
18 enhance packet filtering (see `Connection state match support'
21 To compile it as a module, choose M here. If unsure, say N.
24 bool "Connection tracking flow accounting"
25 depends on IP_NF_CONNTRACK
27 If this option is enabled, the connection tracking code will
28 keep per-flow packet and byte counters.
30 Those counters can be used for flow-based accounting or the
35 config IP_NF_CONNTRACK_MARK
36 bool 'Connection mark tracking support'
37 depends on IP_NF_CONNTRACK
39 This option enables support for connection marks, used by the
40 `CONNMARK' target and `connmark' match. Similar to the mark value
41 of packets, but this mark value is kept in the conntrack session
42 instead of the individual packets.
44 config IP_NF_CONNTRACK_EVENTS
45 bool "Connection tracking events"
46 depends on IP_NF_CONNTRACK
48 If this option is enabled, the connection tracking code will
49 provide a notifier chain that can be used by other kernel code
50 to get notified about changes in the connection tracking state.
54 config IP_NF_CONNTRACK_NETLINK
55 tristate 'Connection tracking netlink interface'
56 depends on IP_NF_CONNTRACK && NETFILTER_NETLINK
57 depends on IP_NF_CONNTRACK!=y || NETFILTER_NETLINK!=m
59 This option enables support for a netlink-based userspace interface
62 config IP_NF_CT_PROTO_SCTP
63 tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
64 depends on IP_NF_CONNTRACK && EXPERIMENTAL
66 With this option enabled, the connection tracking code will
67 be able to do state tracking on SCTP connections.
69 If you want to compile it as a module, say M here and read
70 <file:Documentation/modules.txt>. If unsure, say `N'.
73 tristate "FTP protocol support"
74 depends on IP_NF_CONNTRACK
76 Tracking FTP connections is problematic: special helpers are
77 required for tracking them, and doing masquerading and other forms
78 of Network Address Translation on them.
80 To compile it as a module, choose M here. If unsure, say Y.
83 tristate "IRC protocol support"
84 depends on IP_NF_CONNTRACK
86 There is a commonly-used extension to IRC called
87 Direct Client-to-Client Protocol (DCC). This enables users to send
88 files to each other, and also chat to each other without the need
89 of a server. DCC Sending is used anywhere you send files over IRC,
90 and DCC Chat is most commonly used by Eggdrop bots. If you are
91 using NAT, this extension will enable you to send files and initiate
92 chats. Note that you do NOT need this extension to get files or
93 have others initiate chats, or everything else in IRC.
95 To compile it as a module, choose M here. If unsure, say Y.
97 config IP_NF_NETBIOS_NS
98 tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
99 depends on IP_NF_CONNTRACK && EXPERIMENTAL
101 NetBIOS name service requests are sent as broadcast messages from an
102 unprivileged port and responded to with unicast messages to the
103 same port. This make them hard to firewall properly because connection
104 tracking doesn't deal with broadcasts. This helper tracks locally
105 originating NetBIOS name service requests and the corresponding
106 responses. It relies on correct IP address configuration, specifically
107 netmask and broadcast address. When properly configured, the output
108 of "ip address show" should look similar to this:
110 $ ip -4 address show eth0
111 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
112 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
114 To compile it as a module, choose M here. If unsure, say N.
117 tristate "TFTP protocol support"
118 depends on IP_NF_CONNTRACK
120 TFTP connection tracking helper, this is required depending
121 on how restrictive your ruleset is.
122 If you are using a tftp client behind -j SNAT or -j MASQUERADING
125 To compile it as a module, choose M here. If unsure, say Y.
128 tristate "Amanda backup protocol support"
129 depends on IP_NF_CONNTRACK
131 If you are running the Amanda backup package <http://www.amanda.org/>
132 on this machine or machines that will be MASQUERADED through this
133 machine, then you may want to enable this feature. This allows the
134 connection tracking and natting code to allow the sub-channels that
135 Amanda requires for communication of the backup data, messages and
138 To compile it as a module, choose M here. If unsure, say Y.
141 tristate "IP Userspace queueing via NETLINK (OBSOLETE)"
143 Netfilter has the ability to queue packets to user space: the
144 netlink device can be used to access them using this driver.
146 This option enables the old IPv4-only "ip_queue" implementation
147 which has been obsoleted by the new "nfnetlink_queue" code (see
148 CONFIG_NETFILTER_NETLINK_QUEUE).
150 To compile it as a module, choose M here. If unsure, say N.
152 config IP_NF_IPTABLES
153 tristate "IP tables support (required for filtering/masq/NAT)"
155 iptables is a general, extensible packet identification framework.
156 The packet filtering and full NAT (masquerading, port forwarding,
157 etc) subsystems now use this: say `Y' or `M' here if you want to use
160 To compile it as a module, choose M here. If unsure, say N.
163 config IP_NF_MATCH_LIMIT
164 tristate "limit match support"
165 depends on IP_NF_IPTABLES
167 limit matching allows you to control the rate at which a rule can be
168 matched: mainly useful in combination with the LOG target ("LOG
169 target support", below) and to avoid some Denial of Service attacks.
171 To compile it as a module, choose M here. If unsure, say N.
173 config IP_NF_MATCH_IPRANGE
174 tristate "IP range match support"
175 depends on IP_NF_IPTABLES
177 This option makes possible to match IP addresses against IP address
180 To compile it as a module, choose M here. If unsure, say N.
182 config IP_NF_MATCH_MAC
183 tristate "MAC address match support"
184 depends on IP_NF_IPTABLES
186 MAC matching allows you to match packets based on the source
187 Ethernet address of the packet.
189 To compile it as a module, choose M here. If unsure, say N.
191 config IP_NF_MATCH_PKTTYPE
192 tristate "Packet type match support"
193 depends on IP_NF_IPTABLES
195 Packet type matching allows you to match a packet by
196 its "class", eg. BROADCAST, MULTICAST, ...
199 iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
201 To compile it as a module, choose M here. If unsure, say N.
203 config IP_NF_MATCH_MARK
204 tristate "netfilter MARK match support"
205 depends on IP_NF_IPTABLES
207 Netfilter mark matching allows you to match packets based on the
208 `nfmark' value in the packet. This can be set by the MARK target
211 To compile it as a module, choose M here. If unsure, say N.
213 config IP_NF_MATCH_MULTIPORT
214 tristate "Multiple port match support"
215 depends on IP_NF_IPTABLES
217 Multiport matching allows you to match TCP or UDP packets based on
218 a series of source or destination ports: normally a rule can only
219 match a single range of ports.
221 To compile it as a module, choose M here. If unsure, say N.
223 config IP_NF_MATCH_TOS
224 tristate "TOS match support"
225 depends on IP_NF_IPTABLES
227 TOS matching allows you to match packets based on the Type Of
228 Service fields of the IP packet.
230 To compile it as a module, choose M here. If unsure, say N.
232 config IP_NF_MATCH_RECENT
233 tristate "recent match support"
234 depends on IP_NF_IPTABLES
236 This match is used for creating one or many lists of recently
237 used addresses and then matching against that/those list(s).
239 Short options are available by using 'iptables -m recent -h'
240 Official Website: <http://snowman.net/projects/ipt_recent/>
242 To compile it as a module, choose M here. If unsure, say N.
244 config IP_NF_MATCH_ECN
245 tristate "ECN match support"
246 depends on IP_NF_IPTABLES
248 This option adds a `ECN' match, which allows you to match against
249 the IPv4 and TCP header ECN fields.
251 To compile it as a module, choose M here. If unsure, say N.
253 config IP_NF_MATCH_DSCP
254 tristate "DSCP match support"
255 depends on IP_NF_IPTABLES
257 This option adds a `DSCP' match, which allows you to match against
258 the IPv4 header DSCP field (DSCP codepoint).
260 The DSCP codepoint can have any value between 0x0 and 0x4f.
262 To compile it as a module, choose M here. If unsure, say N.
264 config IP_NF_MATCH_AH_ESP
265 tristate "AH/ESP match support"
266 depends on IP_NF_IPTABLES
268 These two match extensions (`ah' and `esp') allow you to match a
269 range of SPIs inside AH or ESP headers of IPSec packets.
271 To compile it as a module, choose M here. If unsure, say N.
273 config IP_NF_MATCH_LENGTH
274 tristate "LENGTH match support"
275 depends on IP_NF_IPTABLES
277 This option allows you to match the length of a packet against a
278 specific value or range of values.
280 To compile it as a module, choose M here. If unsure, say N.
282 config IP_NF_MATCH_TTL
283 tristate "TTL match support"
284 depends on IP_NF_IPTABLES
286 This adds CONFIG_IP_NF_MATCH_TTL option, which enabled the user
287 to match packets by their TTL value.
289 To compile it as a module, choose M here. If unsure, say N.
291 config IP_NF_MATCH_TCPMSS
292 tristate "tcpmss match support"
293 depends on IP_NF_IPTABLES
295 This option adds a `tcpmss' match, which allows you to examine the
296 MSS value of TCP SYN packets, which control the maximum packet size
299 To compile it as a module, choose M here. If unsure, say N.
301 config IP_NF_MATCH_HELPER
302 tristate "Helper match support"
303 depends on IP_NF_CONNTRACK && IP_NF_IPTABLES
305 Helper matching allows you to match packets in dynamic connections
306 tracked by a conntrack-helper, ie. ip_conntrack_ftp
308 To compile it as a module, choose M here. If unsure, say Y.
310 config IP_NF_MATCH_STATE
311 tristate "Connection state match support"
312 depends on IP_NF_CONNTRACK && IP_NF_IPTABLES
314 Connection state matching allows you to match packets based on their
315 relationship to a tracked connection (ie. previous packets). This
316 is a powerful tool for packet classification.
318 To compile it as a module, choose M here. If unsure, say N.
320 config IP_NF_MATCH_CONNTRACK
321 tristate "Connection tracking match support"
322 depends on IP_NF_CONNTRACK && IP_NF_IPTABLES
324 This is a general conntrack match module, a superset of the state match.
326 It allows matching on additional conntrack information, which is
327 useful in complex configurations, such as NAT gateways with multiple
328 internet links or tunnels.
330 To compile it as a module, choose M here. If unsure, say N.
332 config IP_NF_MATCH_OWNER
333 tristate "Owner match support"
334 depends on IP_NF_IPTABLES
336 Packet owner matching allows you to match locally-generated packets
337 based on who created them: the user, group, process or session.
339 To compile it as a module, choose M here. If unsure, say N.
341 config IP_NF_MATCH_PHYSDEV
342 tristate "Physdev match support"
343 depends on IP_NF_IPTABLES && BRIDGE_NETFILTER
345 Physdev packet matching matches against the physical bridge ports
346 the IP packet arrived on or will leave by.
348 To compile it as a module, choose M here. If unsure, say N.
350 config IP_NF_MATCH_ADDRTYPE
351 tristate 'address type match support'
352 depends on IP_NF_IPTABLES
354 This option allows you to match what routing thinks of an address,
355 eg. UNICAST, LOCAL, BROADCAST, ...
357 If you want to compile it as a module, say M here and read
358 <file:Documentation/modules.txt>. If unsure, say `N'.
360 config IP_NF_MATCH_REALM
361 tristate 'realm match support'
362 depends on IP_NF_IPTABLES
365 This option adds a `realm' match, which allows you to use the realm
366 key from the routing subsystem inside iptables.
368 This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
371 If you want to compile it as a module, say M here and read
372 <file:Documentation/modules.txt>. If unsure, say `N'.
374 config IP_NF_MATCH_SCTP
375 tristate 'SCTP protocol match support'
376 depends on IP_NF_IPTABLES
378 With this option enabled, you will be able to use the iptables
379 `sctp' match in order to match on SCTP source/destination ports
380 and SCTP chunk types.
382 If you want to compile it as a module, say M here and read
383 <file:Documentation/modules.txt>. If unsure, say `N'.
385 config IP_NF_MATCH_DCCP
386 tristate 'DCCP protocol match support'
387 depends on IP_NF_IPTABLES
389 With this option enabled, you will be able to use the iptables
390 `dccp' match in order to match on DCCP source/destination ports
393 If you want to compile it as a module, say M here and read
394 <file:Documentation/modules.txt>. If unsure, say `N'.
396 config IP_NF_MATCH_COMMENT
397 tristate 'comment match support'
398 depends on IP_NF_IPTABLES
400 This option adds a `comment' dummy-match, which allows you to put
401 comments in your iptables ruleset.
403 If you want to compile it as a module, say M here and read
404 <file:Documentation/modules.txt>. If unsure, say `N'.
406 config IP_NF_MATCH_CONNMARK
407 tristate 'Connection mark match support'
408 depends on IP_NF_CONNTRACK_MARK && IP_NF_IPTABLES
410 This option adds a `connmark' match, which allows you to match the
411 connection mark value previously set for the session by `CONNMARK'.
413 If you want to compile it as a module, say M here and read
414 <file:Documentation/modules.txt>. The module will be called
415 ipt_connmark.o. If unsure, say `N'.
417 config IP_NF_MATCH_CONNBYTES
418 tristate 'Connection byte/packet counter match support'
419 depends on IP_NF_CT_ACCT && IP_NF_IPTABLES
421 This option adds a `connbytes' match, which allows you to match the
422 number of bytes and/or packets for each direction within a connection.
424 If you want to compile it as a module, say M here and read
425 <file:Documentation/modules.txt>. If unsure, say `N'.
427 config IP_NF_MATCH_HASHLIMIT
428 tristate 'hashlimit match support'
429 depends on IP_NF_IPTABLES
431 This option adds a new iptables `hashlimit' match.
433 As opposed to `limit', this match dynamically crates a hash table
434 of limit buckets, based on your selection of source/destination
435 ip addresses and/or ports.
437 It enables you to express policies like `10kpps for any given
438 destination IP' or `500pps from any given source IP' with a single
441 config IP_NF_MATCH_STRING
442 tristate 'string match support'
443 depends on IP_NF_IPTABLES
445 select TEXTSEARCH_KMP
447 select TEXTSEARCH_FSM
449 This option adds a `string' match, which allows you to look for
450 pattern matchings in packets.
452 To compile it as a module, choose M here. If unsure, say N.
454 # `filter', generic and specific targets
456 tristate "Packet filtering"
457 depends on IP_NF_IPTABLES
459 Packet filtering defines a table `filter', which has a series of
460 rules for simple packet filtering at local input, forwarding and
461 local output. See the man page for iptables(8).
463 To compile it as a module, choose M here. If unsure, say N.
465 config IP_NF_TARGET_REJECT
466 tristate "REJECT target support"
467 depends on IP_NF_FILTER
469 The REJECT target allows a filtering rule to specify that an ICMP
470 error should be issued in response to an incoming packet, rather
471 than silently being dropped.
473 To compile it as a module, choose M here. If unsure, say N.
475 config IP_NF_TARGET_LOG
476 tristate "LOG target support"
477 depends on IP_NF_IPTABLES
479 This option adds a `LOG' target, which allows you to create rules in
480 any iptables table which records the packet header to the syslog.
482 To compile it as a module, choose M here. If unsure, say N.
484 config IP_NF_TARGET_ULOG
485 tristate "ULOG target support"
486 depends on IP_NF_IPTABLES
488 This option adds a `ULOG' target, which allows you to create rules in
489 any iptables table. The packet is passed to a userspace logging
490 daemon using netlink multicast sockets; unlike the LOG target
491 which can only be viewed through syslog.
493 The apropriate userspace logging daemon (ulogd) may be obtained from
494 <http://www.gnumonks.org/projects/ulogd/>
496 To compile it as a module, choose M here. If unsure, say N.
498 config IP_NF_TARGET_TCPMSS
499 tristate "TCPMSS target support"
500 depends on IP_NF_IPTABLES
502 This option adds a `TCPMSS' target, which allows you to alter the
503 MSS value of TCP SYN packets, to control the maximum size for that
504 connection (usually limiting it to your outgoing interface's MTU
507 This is used to overcome criminally braindead ISPs or servers which
508 block ICMP Fragmentation Needed packets. The symptoms of this
509 problem are that everything works fine from your Linux
510 firewall/router, but machines behind it can never exchange large
512 1) Web browsers connect, then hang with no data received.
513 2) Small mail works fine, but large emails hang.
514 3) ssh works fine, but scp hangs after initial handshaking.
516 Workaround: activate this option and add a rule to your firewall
519 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
520 -j TCPMSS --clamp-mss-to-pmtu
522 To compile it as a module, choose M here. If unsure, say N.
524 # NAT + specific targets
527 depends on IP_NF_IPTABLES && IP_NF_CONNTRACK
529 The Full NAT option allows masquerading, port forwarding and other
530 forms of full Network Address Port Translation. It is controlled by
531 the `nat' table in iptables: see the man page for iptables(8).
533 To compile it as a module, choose M here. If unsure, say N.
535 config IP_NF_NAT_NEEDED
537 depends on IP_NF_NAT != n
540 config IP_NF_TARGET_MASQUERADE
541 tristate "MASQUERADE target support"
544 Masquerading is a special case of NAT: all outgoing connections are
545 changed to seem to come from a particular interface's address, and
546 if the interface goes down, those connections are lost. This is
547 only useful for dialup accounts with dynamic IP address (ie. your IP
548 address will be different on next dialup).
550 To compile it as a module, choose M here. If unsure, say N.
552 config IP_NF_TARGET_REDIRECT
553 tristate "REDIRECT target support"
556 REDIRECT is a special case of NAT: all incoming connections are
557 mapped onto the incoming interface's address, causing the packets to
558 come to the local machine instead of passing through. This is
559 useful for transparent proxies.
561 To compile it as a module, choose M here. If unsure, say N.
563 config IP_NF_TARGET_NETMAP
564 tristate "NETMAP target support"
567 NETMAP is an implementation of static 1:1 NAT mapping of network
568 addresses. It maps the network address part, while keeping the host
569 address part intact. It is similar to Fast NAT, except that
570 Netfilter's connection tracking doesn't work well with Fast NAT.
572 To compile it as a module, choose M here. If unsure, say N.
574 config IP_NF_TARGET_SAME
575 tristate "SAME target support"
578 This option adds a `SAME' target, which works like the standard SNAT
579 target, but attempts to give clients the same IP for all connections.
581 To compile it as a module, choose M here. If unsure, say N.
583 config IP_NF_NAT_SNMP_BASIC
584 tristate "Basic SNMP-ALG support (EXPERIMENTAL)"
585 depends on EXPERIMENTAL && IP_NF_NAT
588 This module implements an Application Layer Gateway (ALG) for
589 SNMP payloads. In conjunction with NAT, it allows a network
590 management system to access multiple private networks with
591 conflicting addresses. It works by modifying IP addresses
592 inside SNMP payloads to match IP-layer NAT mapping.
594 This is the "basic" form of SNMP-ALG, as described in RFC 2962
596 To compile it as a module, choose M here. If unsure, say N.
600 depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
601 default IP_NF_NAT if IP_NF_IRC=y
602 default m if IP_NF_IRC=m
604 # If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
605 # or $CONFIG_IP_NF_FTP (m or y), whichever is weaker. Argh.
608 depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
609 default IP_NF_NAT if IP_NF_FTP=y
610 default m if IP_NF_FTP=m
612 config IP_NF_NAT_TFTP
614 depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
615 default IP_NF_NAT if IP_NF_TFTP=y
616 default m if IP_NF_TFTP=m
618 config IP_NF_NAT_AMANDA
620 depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
621 default IP_NF_NAT if IP_NF_AMANDA=y
622 default m if IP_NF_AMANDA=m
624 # mangle + specific targets
626 tristate "Packet mangling"
627 depends on IP_NF_IPTABLES
629 This option adds a `mangle' table to iptables: see the man page for
630 iptables(8). This table is used for various packet alterations
631 which can effect how the packet is routed.
633 To compile it as a module, choose M here. If unsure, say N.
635 config IP_NF_TARGET_TOS
636 tristate "TOS target support"
637 depends on IP_NF_MANGLE
639 This option adds a `TOS' target, which allows you to create rules in
640 the `mangle' table which alter the Type Of Service field of an IP
641 packet prior to routing.
643 To compile it as a module, choose M here. If unsure, say N.
645 config IP_NF_TARGET_ECN
646 tristate "ECN target support"
647 depends on IP_NF_MANGLE
649 This option adds a `ECN' target, which can be used in the iptables mangle
652 You can use this target to remove the ECN bits from the IPv4 header of
653 an IP packet. This is particularly useful, if you need to work around
654 existing ECN blackholes on the internet, but don't want to disable
655 ECN support in general.
657 To compile it as a module, choose M here. If unsure, say N.
659 config IP_NF_TARGET_DSCP
660 tristate "DSCP target support"
661 depends on IP_NF_MANGLE
663 This option adds a `DSCP' match, which allows you to match against
664 the IPv4 header DSCP field (DSCP codepoint).
666 The DSCP codepoint can have any value between 0x0 and 0x4f.
668 To compile it as a module, choose M here. If unsure, say N.
670 config IP_NF_TARGET_MARK
671 tristate "MARK target support"
672 depends on IP_NF_MANGLE
674 This option adds a `MARK' target, which allows you to create rules
675 in the `mangle' table which alter the netfilter mark (nfmark) field
676 associated with the packet prior to routing. This can change
677 the routing method (see `Use netfilter MARK value as routing
678 key') and can also be used by other subsystems to change their
681 To compile it as a module, choose M here. If unsure, say N.
683 config IP_NF_TARGET_CLASSIFY
684 tristate "CLASSIFY target support"
685 depends on IP_NF_MANGLE
687 This option adds a `CLASSIFY' target, which enables the user to set
688 the priority of a packet. Some qdiscs can use this value for
689 classification, among these are:
691 atm, cbq, dsmark, pfifo_fast, htb, prio
693 To compile it as a module, choose M here. If unsure, say N.
695 config IP_NF_TARGET_TTL
696 tristate 'TTL target support'
697 depends on IP_NF_MANGLE
699 This option adds a `TTL' target, which enables the user to modify
700 the TTL value of the IP header.
702 While it is safe to decrement/lower the TTL, this target also enables
703 functionality to increment and set the TTL value of the IP header to
704 arbitrary values. This is EXTREMELY DANGEROUS since you can easily
705 create immortal packets that loop forever on the network.
707 To compile it as a module, choose M here. If unsure, say N.
709 config IP_NF_TARGET_CONNMARK
710 tristate 'CONNMARK target support'
711 depends on IP_NF_CONNTRACK_MARK && IP_NF_MANGLE
713 This option adds a `CONNMARK' target, which allows one to manipulate
714 the connection mark value. Similar to the MARK target, but
715 affects the connection mark value rather than the packet mark value.
717 If you want to compile it as a module, say M here and read
718 <file:Documentation/modules.txt>. The module will be called
719 ipt_CONNMARK.o. If unsure, say `N'.
721 config IP_NF_TARGET_CLUSTERIP
722 tristate "CLUSTERIP target support (EXPERIMENTAL)"
723 depends on IP_NF_CONNTRACK_MARK && IP_NF_IPTABLES && EXPERIMENTAL
725 The CLUSTERIP target allows you to build load-balancing clusters of
726 network servers without having a dedicated load-balancing
727 router/server/switch.
729 To compile it as a module, choose M here. If unsure, say N.
731 # raw + specific targets
733 tristate 'raw table support (required for NOTRACK/TRACE)'
734 depends on IP_NF_IPTABLES
736 This option adds a `raw' table to iptables. This table is the very
737 first in the netfilter framework and hooks in at the PREROUTING
740 If you want to compile it as a module, say M here and read
741 <file:Documentation/modules.txt>. If unsure, say `N'.
743 config IP_NF_TARGET_NOTRACK
744 tristate 'NOTRACK target support'
746 depends on IP_NF_CONNTRACK
748 The NOTRACK target allows a select rule to specify
749 which packets *not* to enter the conntrack/NAT
750 subsystem with all the consequences (no ICMP error tracking,
751 no protocol helpers for the selected packets).
753 If you want to compile it as a module, say M here and read
754 <file:Documentation/modules.txt>. If unsure, say `N'.
758 config IP_NF_ARPTABLES
759 tristate "ARP tables support"
761 arptables is a general, extensible packet identification framework.
762 The ARP packet filtering and mangling (manipulation)subsystems
763 use this: say Y or M here if you want to use either of those.
765 To compile it as a module, choose M here. If unsure, say N.
767 config IP_NF_ARPFILTER
768 tristate "ARP packet filtering"
769 depends on IP_NF_ARPTABLES
771 ARP packet filtering defines a table `filter', which has a series of
772 rules for simple ARP packet filtering at local input and
773 local output. On a bridge, you can also specify filtering rules
774 for forwarded ARP packets. See the man page for arptables(8).
776 To compile it as a module, choose M here. If unsure, say N.
778 config IP_NF_ARP_MANGLE
779 tristate "ARP payload mangling"
780 depends on IP_NF_ARPTABLES
782 Allows altering the ARP packet payload: source and destination
783 hardware and network addresses.