$ ip route show
default via 123.123.123.241 dev eno1 onlink
123.123.123.240/29 dev eno1 proto kernel scope link src 123.123.123.242


$ ip route change default via 123.123.123.241 dev eno1 onlink initcwnd 32


$ ip route show
default via 123.123.123.241 dev eno1 onlink initcwnd 32
123.123.123.240/29 dev eno1 proto kernel scope link src 123.123.123.242


sysctl -w net.core.default_qdisc=fq