MPTCP Sysfs variables¶
/proc/sys/net/mptcp/* Variables¶
- 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)
- 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
- 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
- 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
- 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
- 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.
0 - In-kernel path manager
1 - Userspace path manager
Default: 0
- 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
- scheduler - STRING
Select the scheduler of your choice.
Support for selection of different schedulers. This is a per-namespace sysctl.
Default: “default”