> Unfortunately, IPv4 doesn't allow [two IP addresses on one network interface]
That has nothing to do with IPv4, and has everything to do with you using obsolete tools (ifconfig). Use “/bin/ip address add $ADDRESS/$NETMASK dev $INTERFACE” and assign as many addresses as you like – the OS and drivers supports it just fine.
(Not that this should convince anyone to stay in the sinking country that is IPv4.)
That has nothing to do with IPv4, and has everything to do with you using obsolete tools (ifconfig). Use “/bin/ip address add $ADDRESS/$NETMASK dev $INTERFACE” and assign as many addresses as you like – the OS and drivers supports it just fine.
(Not that this should convince anyone to stay in the sinking country that is IPv4.)