Dave Taht pointed out to me that this doesn't work in toybox: $ ifconfig eth0 242.2.0.1 netmask 255.255.255.0 broadcast 242.2.0.255 ifconfig: ioctl 8916: Invalid argument
Because of this in the kernel: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/ipv4/devinet.c#n940 What is the inet_abc_len() function _for_? When's the last time "class A, Class B, and Class C" IPv4 addresses actually _existed_ as a thing? (Somewhere around 1995?) He suggested I switch to the netlink API, which doesn't enforce this, but... why is the kernel enforcing it for one api but not the other? Rob