Based on kernel version 6.15
. Page generated on 2025-05-29 09:09 EST
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | .. SPDX-License-Identifier: GPL-2.0 ===================== MPTCP Sysfs variables ===================== /proc/sys/net/mptcp/* Variables =============================== add_addr_timeout - INTEGER (seconds) Set the timeout after which an ADD_ADDR control message will be resent to an MPTCP peer that has not acknowledged a previous ADD_ADDR message. The default value matches TCP_RTO_MAX. This is a per-namespace sysctl. Default: 120 allow_join_initial_addr_port - BOOLEAN Allow peers to send join requests to the IP address and port number used by the initial subflow if the value is 1. This controls a flag that is sent to the peer at connection time, and whether such join requests are accepted or denied. Joins to addresses advertised with ADD_ADDR are not affected by this value. This is a per-namespace sysctl. Default: 1 available_path_managers - STRING Shows the available path managers choices that are registered. More path managers may be available, but not loaded. available_schedulers - STRING Shows the available schedulers choices that are registered. More packet schedulers may be available, but not loaded. blackhole_timeout - INTEGER (seconds) Initial time period in second to disable MPTCP on active MPTCP sockets when a MPTCP firewall blackhole issue happens. This time period will grow exponentially when more blackhole issues get detected right after MPTCP is re-enabled and will reset to the initial value when the blackhole issue goes away. 0 to disable the blackhole detection. This is a per-namespace sysctl. Default: 3600 checksum_enabled - BOOLEAN Control whether DSS checksum can be enabled. DSS checksum can be enabled if the value is nonzero. This is a per-namespace sysctl. Default: 0 close_timeout - INTEGER (seconds) Set the make-after-break timeout: in absence of any close or shutdown syscall, MPTCP sockets will maintain the status unchanged for such time, after the last subflow removal, before moving to TCP_CLOSE. The default value matches TCP_TIMEWAIT_LEN. This is a per-namespace sysctl. Default: 60 enabled - BOOLEAN Control whether MPTCP sockets can be created. MPTCP sockets can be created if the value is 1. This is a per-namespace sysctl. Default: 1 (enabled) path_manager - STRING Set the default path manager name to use for each new MPTCP socket. In-kernel path management will control subflow connections and address advertisements according to per-namespace values configured over the MPTCP netlink API. Userspace path management puts per-MPTCP-connection subflow connection decisions and address advertisements under control of a privileged userspace program, at the cost of more netlink traffic to propagate all of the related events and commands. This is a per-namespace sysctl. * "kernel" - In-kernel path manager * "userspace" - Userspace path manager Default: "kernel" pm_type - INTEGER Set the default path manager type to use for each new MPTCP socket. In-kernel path management will control subflow connections and address advertisements according to per-namespace values configured over the MPTCP netlink API. Userspace path management puts per-MPTCP-connection subflow connection decisions and address advertisements under control of a privileged userspace program, at the cost of more netlink traffic to propagate all of the related events and commands. This is a per-namespace sysctl. Deprecated since v6.15, use path_manager instead. * 0 - In-kernel path manager * 1 - Userspace path manager Default: 0 scheduler - STRING Select the scheduler of your choice. Support for selection of different schedulers. This is a per-namespace sysctl. Default: "default" stale_loss_cnt - INTEGER The number of MPTCP-level retransmission intervals with no traffic and pending outstanding data on a given subflow required to declare it stale. The packet scheduler ignores stale subflows. A low stale_loss_cnt value allows for fast active-backup switch-over, an high value maximize links utilization on edge scenarios e.g. lossy link with high BER or peer pausing the data processing. This is a per-namespace sysctl. Default: 4 syn_retrans_before_tcp_fallback - INTEGER The number of SYN + MP_CAPABLE retransmissions before falling back to TCP, i.e. dropping the MPTCP options. In other words, if all the packets are dropped on the way, there will be: * The initial SYN with MPTCP support * This number of SYN retransmitted with MPTCP support * The next SYN retransmissions will be without MPTCP support 0 means the first retransmission will be done without MPTCP options. >= 128 means that all SYN retransmissions will keep the MPTCP options. A lower number might increase false-positive MPTCP blackholes detections. This is a per-namespace sysctl. Default: 2 |