Hi. There isn't a difference from perspective of routing. On 27 April 2018 at 11:52, Wilhelm Schuster <w...@rot13.io> wrote: > Hi, > > I’m learning about IP-networking and am in the process of setting up a Linux > router using bird. During my research I’ve come across the usage of loopback > interfaces. I could gather that this is done, because Ethernet interfaces for > example (in contrast to loopbacks) can go down making the addresses > configured on them unavailable. In addition, the kernel accepts packets > destined to loopbacks addresses on other interfaces making these addresses > available on multiple interfaces and not just the loopback. > > On Linux I found both the lo(opback), and dummy interfaces recommended to > achieve the behavior outlined above. What I’m struggling with is > understanding the differences between both interface types (besides the > obvious difference in packet processing) and when to use which. Searching > this mailing list I’ve seen people use lo, on other sites dummy interfaces > are recommended. From a quick test (assigning address to lo/dummy; > pinging/receiving pings on the host) I wasn’t able to find a difference. > > When should I use which interface? > > Cheers, Wilhelm.
-- Anton.
