On 14.05.2019 20:49, M. Buecher wrote: > Preamble: I'm just a network hobbyist at home, so please bear with me if > something in this mail is "stupid" from an expert's point of view. > > According to the documentation [1] "IP-Aliasing" is an obsolete way to manage > multiple IP[v4]-addresses/masks on an interface. > For having multiple IP[v4]-addresses on an interface this is absolutely true. > > For me "IP-Aliasing" is still a valid, good and easy way to "group" ip > addresses to run multiple instances of the same service with different IPs > via virtual interfaces on a single physical NIC. > This sounds like you don't necessarily need additional virtual interfaces but simply additional IP addresses at the primary interface -> ip address help
> Short story: > I recently added IPv6 to my LAN setup and recognized that IP-Aliasing is not > support by the kernel. > Could IP-Aliasing support for IPv6 be added to the kernel? > > Long story: > I tried to find out how to do virtual network interfaces "The Right Way (tm)" > nowadays. > So I came across MACVLAN, IPVLAN and alike on the internet, mostly in > conjunction with containers or VMs. > But MACVLAN/IPVLAN do not provide the same usability as "IP-Aliasing", e.g. > user needs to learn a lot about network infrastructre, sysctl settings, > forwarding, etc. > They also do not provide the same functionality, e.g. the virtual interfaces > cannot reach their parent interface. > > In my tests with MACVLAN (bridge)/IPVLAN (L2) pinging between parent and > virtual devices with `ping -I <device> <target ip>` failed for IPv4 and IPV6. > Pinging from outside MACVLAN worked fine for IPv4 but not IPv6, while IPVLAN > failed also for pinging with IPv4 to the virtual interfaces. Pinging to > outside only worked from the parent device. > Unfortunately I could not find any source on the internet that describes how > to setup MACVLAN/IPVLAN and their surroundings correctly for a single > machine. It seems they are just used for containers and VMs. > > If it is possible to setup MACVLAN/IPVLAN that they can reach and also can be > reached from their parent device, other virtual devices and from outside, > then please guide me to the right direction or provide links. Would be much > appreciated. > Otherwise I would like to see IP-Aliasing for IPv6. > > Hope to stimulate further thoughts and thanks for reading > Matthias "Maddes" Bücher > > [1] https://www.kernel.org/doc/html/latest/networking/alias.html > >
