Iptables mark match. I have an application 'A' which binds to an … .

Iptables mark match Commented Apr 26, 2021 at 7:53. i want to know what is the difference between these two commands iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT - iptables -A INPUT -p tcp --dport 80 -j ACCEPT If either no options imply a match or if an option implies multiple matches then you need to specify a match. Follow edited Jan 7, 2020 at 9:54. 6. ip route add local default dev lo table 100. Select a device with data link type RAW, such as a tun device: Set the packet mark to the matching socket's mark. e. SYNOPSIS. Uses the iptables set extension. I'd like to make SSH-identification a little stronger using iptables extensions (or IPSec tools?) for marking (while sending) and matching (while recieving) the packets between my laptop and my server. Can be combined with the --transparent and --nowildcard options to restrict the sockets to be matched when restoring the packet mark. 3. 2 have a bug causing rules of type DROP all -- anywhere anywhere mark match 0x8000/0x8000 /* kubernetes firewall for dropping marked packets */ to be infinitely added to the iptables -A INPUT -p tcp -m string --string "test" -j DROP --algo kmp. 10 -j RETURN; Why do I need RETURN? If a packet matches the first rule then it automatically stops executing other rules. Acknowledgements Now, I'd like to put some rule in the POSTROUTING chain (probably of the mangle table) to match packets marked with 11 and send # Add relevant iptables entries. 0/0 MARK set 0x2 Chain INPUT (policy ACCEPT 385K packets, 474M bytes) Chain KUBE-FIREWALL (2 references) target prot opt source destination DROP all -- anywhere anywhere /* kubernetes firewall for dropping marked packets */ mark match 0x8000/0x8000 The only way get into the same situation as you - is to manually update iptables duplicating the entries and get rig of references. In order to shape ingress, the IFB (Intermediate The Linux kernel's general IP environment has a system for marking packets with what is generally called a fwmark, short for 'firewall mark'. If you are not running this script as a part of a systemd service, I would strongly suggest moving to that, or making use of the existing iptables services and using their ability to save/restore the tables at the appropriate times. SEE ALSO iptables-apply(8), iptables-save(8), iptables-restore(8), iptables-extensions(8), The packet-filtering-HOWTO details iptables usage for packet filtering, the NAT-HOWTO details NAT, the netfil‐ ter-extensions-HOWTO details the extensions that are not in the standard distribution, and the netfilter-hack‐ ing-HOWTO details the iptable rule that marks the openvpn traffic. Chain PREROUTING (policy ACCEPT 388K packets, 474M bytes) num pkts bytes target prot opt in out source destination 1 360K 464M MARK tcp -- * * 0. then echo "Traffic shaping stopped. Using stateful rules often simplifies the IPTABLES doesn't have anything to do with routing tables, what do you mean apply iptables to use table rteth4. For one host, however, I need to remove the iptables mark (i. Example: An application opens 2 transparent (IP_TRANSPARENT) sockets and sets a mark on them with SO_MARK socket option. get_value → Tuple [int, Optional [int]] [source] ¶ # Reset/Flush iptables iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT #Reset/Flush/Setup IP Route (table 4) ip route flush table 4 ip route show table main | grep -Ev ^default | while read ROUTE ; do ip route Conning the Mark: Multiwan connections using IPTables, MARK, CONNMARK and iproute2 Over the past few months, I have been configuring a replacement multi-wan NAT router/firewall for work. The xt_cgroup module is there, but iptables with -m cgroup does not find the match target and the net_filter mount does not -m mark --mark 0x80000/0x80000 -m set --match-set ovn40subnets-distributed-gw dst -j RETURN For Service traffic where ExternalTrafficPolicy is Local, if the Endpoint uses a distributed gateway, SNAT is not required. I was trying to change the incoming interface of the packet using iptables MARK and ip route commands. 2. 0/0 0. Per, the man page for iptables the OUTPUT chain for mangle is iptables -A INPUT -p tcp -m multiport --destination-ports 59100 -m multiport --destination-ports 3000 -m state --state NEW -j REJECT --reject-with tcp-reset since matches are always AND-ed together within a rule. mark match options: [!] --mark value[/mask] Match nfmark value with optional mask . Improve this answer. tristate '"socket" match support (EXPERIMENTAL)' depends on EXPERIMENTAL depends on NETFILTER_TPROXY depends on NETFILTER_XTABLES depends on NETFILTER_ADVANCED depends on !NF_CONNTRACK || NF_CONNTRACK select NF_DEFRAG_IPV4 help This option adds a `socket' match, which can be used to match 2. 21-1ubuntu1 It doesn’t stop the packet from being processed by later iptables rules and possibly other MARK targets. iptables -vL. match_set_flags: str: Specifies the necessary flags for the match_set parameter. In that case, generate BPF targeting a device with the same data link type as the xtables match. You need a rule to accept the connections already known, without re-marking them. The thing is when I try to use this rule: iptables -A PREROUTING -i eth0 -p tcp -m tcp --dport 25565 -j DNAT --to-destination 10. iptables -t mangle -N SHADOWSOCKS_UDP_MARK. ) iptables -t mangle -A PREROUTING -m dscp --dscp-class AF12 -j CONNMARK --set-xmark 12 iptables -t mangle -A POSTROUTING -m connmark --mark 12 -j DSCP --set-dscp-class AF12 (not 100% dynamic as the DSCP value need to be known in advance in order to get a match) Share. A mark is a special field, only maintained within the kernel, that is associated with the To get the options list of an iptables match or an iptables target you can use brief built-in help. Because of this, conntrack automatically defragments 参数--mark 范例 iptables -t mangle -A INPUT -m mark --mark 1 说明 用来匹配封包是否被表示某个号码，当封包被 匹配成功时，我们可以透过 MARK 处理动作，将该封包标示一个号码，号码最大不可以超过 4294967296。 参数-m owner --uid-owner 范例 iptables -A OUTPUT -m owner --uid-owner 500 MarkCriterion¶ class MarkCriterion (match: Match) [source] ¶. The comparison value is a tuple consisting of an (integer) mark value and an integer mask value (None in case of no mask). iptables -t mangle -A OUTPUT -m owner --uid-owner 1002 -j MARK --set-mark 11 iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE # Flush ALL THE THINGS. Third, there is a race condition in the -A FORWARD -i eth2 -o br0 -j MARK --set-mark 1234 This will mark any packet that comes from eth2 and is bound for the bridge. The mark can also be masked by using the --mask option described further down. 2 That's why I started looking into marking the packets when they arrive so I can match them on Stack Exchange Network. Changing the mark can be used for mark-based routing without netfilter or for packet filtering. and iptables -t mangle -L shows : enter image description here. We can filter matching packets: Each rule has a matching component and an action component. Chain cali-INPUT (1 references) target prot opt source destination ACCEPT all -- anywhere anywhere /* cali:msRIDfJRWnYwzW4g */ mark match 0x10000/0x10000 cali-wl-to-host all -- anywhere anywhere [goto] /* cali:y4fKWmWkTnYGshVX */ MARK all -- anywhere anywhere /* cali:JnMb-hdLugWL4jEZ */ MARK and 0xfff0ffff cali-from-host-endpoint all I am using the following iptables script to redirect packets on port 443 to a proxy server: iptables -t mangle -A PREROUTING -p tcp --dport 443 -j MARK --set-mark 2 I am redirecting it to my proxy server later on, which is working. Qdiscs on ingress traffic provide only policing with no shaping. Simply use -j MARK --set-mark <marknumber in decimal form>. however,once a packet with matching string is found all the subsequent packets, even with non matching strings are dropped, until i flush the rule from iptable. 4. mark This module matches the netfilter mark field associated with a packet (which can be set using the MARK target below). These rules accept packets which have been given a packet mark value When you want to mark a packet in iptables, you would generally add the following line to your firewall script: iptables -t mangle -A POSTROUTING -p tcp -m multiport --dports 80,443 -j MARK --set- iptables can use extended packet matching modules with the -m or --match options, followed by the matching module name; Some important ones connmark [!] --mark The -m or --match option is used to enable one or more extended packet matching modules with the given name(s). 0 iptables can use extended packet matching and target modules. 25) Set the mark for each packet sent through this socket (similar to the netfilter MARK target but socket-based). Harald Welte wrote the ULOG and NFQUEUE Examples: # allow 2 telnet connections per client host iptables -A INPUT -p tcp --syn --dport 23 -m connlimit --connlimit-above 2 -j REJECT # you can also match the other way around: iptables -A INPUT -p tcp --syn --dport 23 -m connlimit --connlimit-upto 2 -j ACCEPT # limit the number of parallel HTTP requests to 16 per class C sized source The connection tracking system used by iptables for state matching and NAT'ing etc must be able to read the defragmented packet. A list of these is available in the iptables-extensions(8) manpage. 1 and 1. iptables [-t table] the owner match, the mark stuff, and ran around doing cool stuff everywhere. Likewise iptables-save will list all entries including the mentioned counters for each chain, but not for each table entry (on some systems iptables-save requires option -c to include counters). iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT to allow incoming traffic for established and related connections, I get the following error: iptables v1. TL;DR: iptables versions 1. However, the protocol must first be specified in the iptables command. Option--restore-mark: Example: iptables -t mangle -A PREROUTING --dport 80 -j CONNMARK --restore-mark: Explanation iptables can use extended packet matching modules with the -m or --match options, followed by the matching module name; Some important ones connmark [!] --mark value[/mask] Matches packets in connections with the given mark value (if a mask is specified, this is logically ANDed with the mark before the comparison). So your iptables rules need to be in order from least specific to most specific. Rules can be iptables is an application that allows users to configure specific rules that will be enforced by the kernel’s netfilter framework. the packets will not be redirected. it, it does not work on debian jessie. net#docker you have stated that you are using Arch Linux ARM on a Raspberry Pi. ACCEPT means to let the packet through. 21. sorry i can't speak english. I have an application 'A' which binds to an . ip rule add fwmark 1 lookup 100. Share. My collegues and I decided to use Match--mark: Example: iptables -t mangle -A INPUT -m mark --mark 1: Explanation: This match is used to match packets that have previously been marked. The matching portion of a rule specifies the criteria that a packet must meet in order for the associated action (or “target”) to be executed. The resulting operation is: ctmark = (ctmark AND NOT mask) XOR value Zero-out corresponds to (ctmark AND NOT mask): if a bit in mask is set, then the corresponding bit in ctmark will be zero (before the XOR). For example -p tcp <protocol-name> (where <protocol-name> is the target protocol), makes options for the specified protocol available. Example of ingress traffic shaping with SNAT. With the above example, let’s say all traffic goes to the Cups pool and only web traffic gets redirected to the Apache pool. 0/24: iptables -A INPUT -s ! 192. i call nfq_set_verdict_mark to set mark, then i want use this mark in other chain. -m, --match match Specifies a match to use, that is, an extension module that tests for a specific property. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. freenode. 0). 1. 4. 11: numeric: bool: This parameter controls the running of the list -action of iptables, which is used internally by the module Does not affect the actual iptables can use extended packet matching and target modules. The openvpn traffic is generated from the router itself. Even though the traffic is locally generated and hits tcp 501, which should match the rule. By analyzing the queued packets matching any one string, and then matching for second string in my netfilter_queue C module. Fwmarks can be set through iptables, using the MARK target (documented in iptables-extensions), or by facilities such as WireGuard, and can then be used by firewall rules or by 'ip rule' policy based routing. Why? Posted: Tue Feb 08, 2022 17:06 Post subject: iptables dscp marks: Hello, I am having a little bit of trouble. Some network parts interacting with it (see below) can do bitwise operations on this value, it can then be interpreted between one single 32 bits value up to a I want to add connmark match with mark match in single iptable rule. while talking to server. 2-192. the owner match, the mark stuff, and ran around doing cool stuff everywhere. That is just a number. 0 / 24 -p tcp --dport 80 -J DROP -I INPUT 26 -m set --match-set public_services4 dst -j ACCEPT and this doesn't work. The target MARK only works in mangle. A criterion for a mark, used by MarkMatch and ConnmarkMatch since the iptables (8) option used by the mark/connmark modules is the The mark match extension is used to match packets based on the marks they have set. See the description of the -s (source) flag for a detailed description of the syntax. iptables -nL -v --line-numbers -t mangle output:. Visit Stack Exchange iptables -t nat -nvL KUBE-MARK-MASQ Chain KUBE-MARK-MASQ (123 references) pkts bytes target prot opt in out source destination 16 960 MARK all -- * * 0. . The flag --dst is an alias for this option. Is it possible to match a cgroup? iptables seems to have no support for this. To mark packets it better be in PREROUTING chain and preferably mangle table. Also providing the whole ruleset here could help. Mark the packets that wlan0 sends to port 80 with 1 $ iptables -A PREROUTING -i wlan0 -t mangle -p tcp --dport 80 -j MARK --set-mark 1 Add mytable $ echo 201 mytable >> /etc/iproute2/rt_tables iptables -P INPUT DROP to deny incoming traffic. The --set-mark match takes an integer value. 8. If the packet does not match, the next rule in the chain is the examined; if it does match, then the next rule is specified by the value of the target, which can be the name of a user-defined chain or one of the special values ACCEPT, DROP, QUEUE or RETURN. iptables -t mangle -A OUTPUT -p tcp --dport 501 -j MARK --set-mark 2 Startup script. 3,264 18 Different network protocols provide specialized matching options which can be configured to match a particular packet using that protocol. For example: When you troubleshoot nat rules, you should know only first packet What I've been trying to use is the --set-mark flag to flag the packets with either 11 or 12 so the POSTROUTING rules will know what SNAT rule to use. */ mark match 0x10000/0x10000 Chain cali-POSTROUTING (1 references) target prot opt source destination Destination specification. I am trying to get iptables to work on wireshark. The argument that is causing the issue seems to be the -m tcp one. Alternatively, you can do matching against port-indexing ipsets (ipset create blah bitmap:port). I'd like to look at the "More Fragments" flag - a flag which has no existing test in iptables (-f matches 2nd and further fragments, I want to match all fragments except the last). I can add these rules individually, iptables -t mangle -I INPUT -j ACCEPT -i eth2 -m connmark --mark 0x1/0xf iptables -t mangl sudo iptables -t mangle -A OUTPUT --destination 192. According to the netfilter and the IP set counters this rule does not match. Otherwise, iptables will figure out what you mean in the command I double-checked the iptables and it is marking the packets correctly. 10 -j MARK --set-mark 30; iptables -A PREROUTING -t mangle -i wlan0 -s 192. actor mark by に in causative-passive Iptables is a software firewall for Linux distributions. 本文着重分析内核中CONNMARK的实现，同时还包括MARK的match和target模块的实现。因为CONNMARK模块通常是和MARK模块搭配使用的。关于iptables中如何使用这三个模块，参看本人的另外一篇文章《Netfilter CONNMARK用法及分析（一）--iptables命令行的使用》。 iptables -m u32 --u32 "0&0x00FF0000>>16=0x08" which is the equivalent of: iptables -m ttl --tos 8 Inspecting individual bits. my iptables chain as follow: iptables -A FORWARD -m length --length 0:1500 -j NFQUEUE --queue-balance 50:53; iptables -A OUTPUT -m mark --mark 17 How to list all loadable modules in iptables (given after the -m flag)? This post proposes to list loadable modules with ls /lib*/iptables/ I don't have this folder with my version (v1. I have tried this approach which suggests the use of iptable Mark and iproute2 utilities instead of ROUTE target, but could not find any success changing the incoming interface of the packet in the receiving path. For incoming packets I use -t mangle -A PREROUTING, for outgoing packets -t mangle -A OUTPUT. This includes These fwmark you can set with iptables, so can create an ip rule with every match iptables is capable of. â â <M> "connmark" connection mark match support â â â â <M Different network protocols provide specialized matching options which can be configured to match a particular packet using that protocol. This module attempts to match various characteristics of the packet creator, for locally generated packets. To mark a packet to match localhost:23, you can do this: iptables -t mangle -I PREROUTING -d localhost -p tcp --dport 23 -j MARK --set-mark 2 With unix users its possible with iptables "-m owner --set-mark" and then routing with "ip rule". But when I try. Matching. 5:iptables -t mangle -A Posted: Mon Jun 25, 2007 8:13 pm Post subject: [ SOLVED ] iptables: No chain/target/match by that name: Hello all. Follow iptables -A PREROUTING -t mangle -i wlan0 -s 192. The matching system is very flexible and can be expanded significantly with additional iptables extensions. If the packet does not match, the next rule in the chain is the examined; if it does I want to mark packets sent to a certain port (80 for simplicity sake) and route them to tun0 (which is created by openvpn). The working configuration (as far as I can tell and get proper 3074 48 dscp on wireshark) is sudo iptables -A INPUT -p tcp -j QUEUE ! -f -m string --string "abc" --algo bm -m string --string "def" --algo bm. but the mark is likely not active. (The cmd-owner flag appears to have been removed). 11 iptables -t nat -A POSTROUTING -m mark --mark 12 -o eth1 -j SNAT --to-source 20. pkttype [!] --pkttype-type type Matches on the Ethernet "class" of the frame, which is iptables/ip6tables — administration tool for IPv4/IPv6 packet filtering and NAT. They only exist within the local kernel's network stack (and they're a Linux-specific mechanism anyway – there is no standard iptables -t mangle -A POSTROUTING -m iprange --src-range 192. Chain KUBE-FORWARD (1 references) target prot opt source destination DROP all -- anywhere anywhere I am trying to route packets on specific port to a VPN client using iptables. That works well. For example, we may set mark 2 on a specific stream of packets, or on all packets from a specific host and then do advanced routing on that host Set the packet mark to the matching socket's mark. iptables -t mangle -N DIVERT iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT iptables -t mangle -A DIVERT -j MARK --set-mark 1 iptables -t mangle -A DIVERT -j ACCEPT I can check it: [root@localhost go-tproxy]# iptables -n -L -t mangle Chain PREROUTING (policy ACCEPT) target prot opt source destination DIVERT tcp -- 0. – Martin Commented Jan 2, 2013 at 13:27 So the syntax is --set-xmark value/mask. James Morris wrote the TOS target, and tos match. Versions of involved packages: ipset: 6. Byte 6 contains this, so I'll start iptables will list packet and byte counters if you specify option -v for verbose, e. Kevdog777. Iptables passes packets from the network layer up, without mac layer. 1 The code l TARGETS A firewall rule specifies criteria for a packet and a target. The man page also states:--and-mark bits Binary AND the ctmark with bits. For example, if you have set a packet mark with the MARK target, you can then move this mark to mark the whole connection with the --save-mark match. This method is definitely slower. 0/0 MARK or 0x4000 The IP address MARK (Can be used by the iproute2 programs; remember my earlier post on WireGuard & Tailscale?) CONNMARK (see below) outgoing interface (-o, –out This sets that mark 6, using iptables # iptables -A PREROUTING -t mangle -i eth0-j MARK --set-mark 6 You can then use iptables normally to match packets and then mark them with fwmark. Fwmarks are how I iptables can use extended packet matching and target modules. i want using iptables connmark match with mark match. I need no VPN, just to send additional information in IP Options header (or in the AH field?). ip route flush table main The exclamation mark inverts the match so this will result is a match if the IP is anything except one in the given range 192. I am frettingly having a couple difficulties with iptables, and am hoping those who have had more experience with these type of issues might be able to help. conntrack; ipvs; mark Am using libiptc -library to manipulate the iptables programatically to add nat rule similar to below. 33. Note that you can also use the protocol ID, instead of the protocol name. Quote: If the matching task is such that once you have matched the connection with your iptables rule (probably based upon the syn packet, a single other packet, or some heuristic using a series of packets), you can simply rely upon conntrack's matching (and every packet over the connection should also be a match), then use connmark. 20. 168. 1 -j TPROXY --tproxy-mark 10 --on-port 10001 Packets with mark 11 will be re-marked to 10 and will be matched and processed by the the TPROXY iptables rule pointing to the table with local loopback iptables -t mangle -A PREROUTING --destination 192. DROP all -- anywhere anywhere /* kubernetes firewall for dropping marked packets */ mark match 0x8000/0x8000. iptables -A PREROUTING -t mangle -j CONNMARK --restore-mark iptables -A PREROUTING -t mangle -m mark ! --mark 0 -j ACCEPT iptables -A PREROUTING -t mangle -m mark --mark 0 -m nth --counter 1 \ --every 3 Now I want to expose it to the outside by routing traffic directly to the IP address from metallb using iptables. DIAGNOSTICS the owner match, the mark stuff, and ran around doing cool stuff everywhere. 7 (nf_tables): Couldn't load match `conntrack':No such file or directory Since this can be implemented with two rules, why would the authors of ipset + the iptables set match ever care to attempt to do this with one rule only? Do you have a practical case where this does matter? – A. The following rules were applied in iptables: Cg96MgVuoPm7UMRo */ /* Host endpoint policy accepted packet. This can be used to Match against the packet’s fwmark. iptables mark. 0 -j MARK --set-mark 11 sudo iptables -t nat -A OUTPUT -m mark --mark 11 -j DNAT --to-destination ${DESTINATION_IP} sudo iptables -t nat -A POSTROUTING -m mark --mark 11 -j SNAT --to-source ${SOURCE_IP} To get the options list of an iptables match or an iptables target you can use I found the SO_MARK socket option in socket(7) man page: SO_MARK (since Linux 2. g. i would like to know why is this happening and what is the solution for it. thanks In irc. This cheat sheet-style guide provides a quick reference to iptables commands that will create firewall rules that are useful in common, everyday scenarios. Then we add this rule to ebtables:-A OUTPUT -o eth0 --mark 1234 -j DROP Which will DROP any packet marked by iptables (as being from eth2) that is egressing via the specific bridge port eth0. Take for example the module connbytes. Jozsef Kadlecsik wrote the REJECT target. [!] --mark value[/mask] Matches packets with the given IP packets while within a Linux host have an attribute called packet mark. Code: iptables -t mangle -A PREROUTING -m mark --mark 1 -m connmark --mark 2 -j ACCEPT. All packets traveling through Netfilter get a special mark field associated with them. " exit fi #Marking packets that are forwarded iptables -A FORWARD -t mangle -j MARK --set-mark 1 # Policing incoming traffic using ingress qdisc tc qdisc add dev eth0 handle ffff: ingress tc filter add dev eth0 parent ffff: protocol ip 本文详细解析了 iptables 中 MARK 模块的功能及其应用场景，包括不同标记模块的区别与联系，如 -m mark, -m connmark, -j MARK 等，并通过实例展示了如何利用这些模块实现连接标记和数据包限速。 本文着重分析内核中CONNMARK的实现，同时还包括MARK的match和target模块的 --set-mark: Example: iptables -t mangle -A PREROUTING -p tcp --dport 22 -j MARK --set-mark 2: Explanation: The --set-mark option is required to set a mark. Marks can be set with the MARK target which we will discuss in the next section. 2:25565 I get: iptables: No chain/target/match by that name. A criterion for a mark, used by MarkMatch and ConnmarkMatch since the iptables(8) option used by the mark/connmark modules is the same. Here are my rules: Iptables marks are never actually sent on the wire. 0/0 MARK set 0x1 2 27269 11M MARK udp -- * * 0. For example, -p <protocol-name> enables options for the specified protocol. This way, only the new connections will trigger the counter. Secondly, iptables(8) warns that --pid-owner is broken on SMP systems (which may or may not apply to you, but in either case limits portability). It acts as a packet filter and firewall that examines and directs traffic based on port, protocol and -m mark --mark 0x80000/0x80000 -m set --match-set ovn40subnets-distributed-gw dst -j RETURN For Service traffic where ExternalTrafficPolicy is Local, if the Endpoint uses a distributed gateway, SNAT is not required. The following iptables statement shows the correct method to match a source MAC address contained within the set: ipset create throttled hash:mac -exist ipset add throttled 00:11:22:33:44:55 -exist iptables -A PREROUTING -t mangle -m set --match-set throttled src -j MARK --set-mark 6 How can I convert: iptables -t mangle -A OUTPUT -m owner --uid-owner root -j MARK --set-mark 1 iptables -A OUTPUT -m owner --uid-owner root -m quota2 --name 10mb_quota --quota 10240000 -j MARK --set-Skip to main content. Must be used together with the match_set parameter. 12 -j MARK --set-mark 12 iptables -t nat -A PREROUTING -m mark --mark 12 -i eth0 -j DNAT --to 20. 1-1; iptables: 1. It has nothing to do with shady blogs, the syntax has changed for iptables and the exclamation mark went before the flag at some point. 0. Version Added: 2. Please be aware that the mark Its use is the same as the limit match of iptables. . B. --limit [value] Maximum average matching rate: specified as a number, with Only specifying a mask is useful to match multiple mark values. Rule : iptables -t nat -A POSTROUTING -m mark --mark 0x2/0x3 -j SNAT --to 1. Owner only allows you to match on the user or group that owns the process, not the process name itself. Can be combined with the --transparent and --nowildcard iptables -t mangle -A OUTPUT -p udp -m mark --mark 11 -j MARK --set-mark 10 iptables -t mangle -A PREROUTING -p udp -m mark --mark 10 -s 10. 200 -j MARK --or-mark 0x1 –or-mark 用于以或的关系设置mark，因为mark可能提前被提前设置过，如之前的mark为0x0100，通过–or-mark设置0x1后mark为0x0101，不会影响之前设置的mark，注意匹配是用掩码按位匹配。 The mark is a 32 bits integer value attached to a network packet. ydc lmipgw mkke hjdfx tedntf vck gqkvy lhi xmg bnvtq