On Thu, Dec 29, 2016 at 04:14:52PM -0200, Till Kamppeter wrote: > On 12/29/2016 02:37 PM, Stéphane Graber wrote: > > > How can I assign a different name to a dummy interface? Can I freely > > > choose > > > a name somehow, for example "ippusbxd"? Or have I to use "dummy1", > > > "dummy2", > > > ... (loading the dummy kernel module with an option to support more than > > > one > > > interface)? > > > > root@castiana:~# ip link add ippusbxd type dummy > > root@castiana:~# ip link set ippusbxd up > > root@castiana:~# ifconfig ippusbxd > > ippusbxd: flags=195<UP,BROADCAST,RUNNING,NOARP> mtu 1500 > > inet6 fe80::3004:2dff:feb6:b5c7 prefixlen 64 scopeid 0x20<link> > > ether 32:04:2d:b6:b5:c7 txqueuelen 1000 (Ethernet) > > RX packets 0 bytes 0 (0.0 B) > > RX errors 0 dropped 0 overruns 0 frame 0 > > TX packets 2 bytes 140 (140.0 B) > > TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 > > > > > > Which gets you your own dummy device with its IPv6 link-local address. > > Thank you very much. I copied and pasted the commands and got an ifconfig > output similar to yours, only with different IP and MAC addresses and > different values in the statistics. > > Then I tried to bind to the IPv6 IP address of this entry, on port 60000 and > this did not work. > > Do I have to create an additional IP address? If yes, how? Do I have to run > additional commands (route?)? Which ones? > > Till
Link-local addresses are slightly special in that they are indeed link local. So you can't bind fe80::3004:2dff:feb6:b5c7 as you could in theory have the same address on multiple interfaces. Instead, you need to tell bind() what interface to bind on. This is typically indicated as fe80::3004:2dff:feb6:b5c7%ippusbxd. For example: stgraber@castiana:~$ nc -l fe80::3004:2dff:feb6:b5c7 1234 nc: Invalid argument ^ Fails because the kernel doesn't know what interface you want. stgraber@castiana:~$ nc -l fe80::3004:2dff:feb6:b5c7%ippusbxd 1234 ^ Works -- Stéphane Graber Ubuntu developer http://www.ubuntu.com
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