MPTCP fullmesh path manager will stop creating subflows after 8 subflows are created
# cat /proc/net/mptcp_fullmesh
Index, Address-ID, Backup, IP-address, if-idx
IPv4, next v4-index: 3
0, 1, 0, 10.48.205.55, 26
1, 2, 0, 10.10.10.1, 14
2, 3, 0, 10.84.19.1, 33
3, 4, 0, 10.9.8.2, 33
4, 5, 0, 10.13.37.1, 21
5, 6, 0, 100.84.2.251, 22
6, 7, 0, 31.206.227.51, 24
7, 8, 0, 95.65.148.183, 23
IPv6, next v6-index: 1
0, 8, 0, fd07:abc9:3cd8:0000:0000:0000:0000:0001, 14
https://github.com/arter97/x86-kernel/commit/443fcdfe3545d63ebac785e359ac42995bd7e014
Out-of-tree MPTCP uses only 8 interfaces out of 16 · Issue #406 · multipath-tcp/mptcp