is "volatile" the cause of ifconfig flags not matching sysfs flags?

Robert P. J. Day
2018-08-23T02:01:42Z

almost certainly another dumb question, but i was poking around the
sysfs, particularly /sys/class/net/<ifname>/*, to familiarize myself
with what i can glean (or set) re interfaces under /sys, and i noticed
"flags", but what i get there doesn't match what i get by running
ifconfig.

specifically, if i list the flags for my wireless interface under
/sys:

$ cat flags
0x1003
$

but with ifconfig:

$ ifconfig wlp2s0
wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
^^^^

do those two "flags" values represent the same set of flags? and
does the obvious difference have to do with some of those flags being
"volatile" as dewscribed in include/uapi/linux/if.h? or am i just
totally misreading this?

rday

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