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

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