Nemu previously had an issue with PIDs above 4 hex digits (> 65535) where created network interfaces would have names of length exceeding IFNAMSIZ. These fixes have been upstreamed in nemu3.
Problems around the @ notation used by iproute have also been fixed and/or upstreamed in nemu3.

This reverts cfb2c159, 06f33ff2 and 27a27263.