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Systemd 197 releasedSystemd 197 releasedPosted Jan 8, 2013 22:46 UTC (Tue) by DarrenJThompson (guest, #88685)In reply to: Systemd 197 released by mezcalero Parent article: Systemd 197 released
Is there a relatively easy way to provide a linking of these names to the more traditional names, for those sort of "dumb apps/scrips" that make an assumption about device names and are not easily adapted.
From what i read, the udev naming rules/mapping thing still works but it would be nice to have that confirmed.
Can the device be mapped into more than one namespace (e.g. eth0 and MAC and path-based) at the same time?
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Systemd 197 released Posted Jan 8, 2013 22:54 UTC (Tue) by mezcalero (subscriber, #45103) [Link]
No, network interfaces cannot have alias names. This is different from device nodes in /dev where we can add as many alias names via symlinks as we want while leaving the primary kernel name intact (and which is what udev does). For network interfaces we can only control one name and one name only. If people wrote their stuff with ethX names in mind, then they should just not use the new naming policy.
Systemd 197 released Posted Jan 8, 2013 23:01 UTC (Tue) by ovitters (subscriber, #27950) [Link]
Could the kernel be changed to allow this, or is that too messy?
Systemd 197 released Posted Jan 9, 2013 0:20 UTC (Wed) by Cyberax (✭ supporter ✭, #52523) [Link]
It's a long-standing issue in Linux (and UNIX). Network devices live in a completely separate namespace from the 'general' devices.
There's also a special API to interact with them which actually uses device _indexes_, not names. As far as I remember, there was not even a way to lookup index by name - one has to enumerate all the devices and get their names using SIOCGIFNAME (though I might be mistaken here).
It's a legacy mess, in short.
Systemd 197 released Posted Jan 9, 2013 7:36 UTC (Wed) by dankamongmen (subscriber, #35141) [Link]
Nowadays one would use netlink, but yeah, same deal.
Systemd 197 released Posted Jan 10, 2013 10:10 UTC (Thu) by justincormack (subscriber, #70439) [Link]
If_name to index(3) which is an ioctl will do it without enumeration. And net link can use names...
Systemd 197 released Posted Jan 9, 2013 0:29 UTC (Wed) by mezcalero (subscriber, #45103) [Link]
People have considered that, but it's not that easy unfortunately.
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