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--- ipp_up_and_iff_running [2018/08/26 11:19] – [Flags] rpjday
+++ ipp_up_and_iff_running [2018/08/27 11:03] (current) – [net/core/dev_ioctl.c] rpjday
@@ Line 9: / Line 9: @@
 ===== Flags =====
-Is ''IFF_LOWER_UP'' significant? Can we use ''IFF_DEBUG''?
+Issues:
+  * Is ''IFF_LOWER_UP'' significant?
+  * Can we use ''IFF_DEBUG''?
+  * Understand actual meaning of "volatile".
 From ''include/uapi/linux/if.h'':
@@ Line 140: / Line 144: @@
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 36836  bytes 9042100 (8.6 MiB)
+        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
+</code>
+==== Up again ====
+UP, shortly followed by RUNNING:
+<code>
+enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
+        inet 192.168.0.15  netmask 255.255.255.0  broadcast 192.168.0.255
+        inet6 fd00:f81d:f81:4062:2e56:dcff:fe25:ad47  prefixlen 64  scopeid 0x0<global>
+        inet6 fe80::2e56:dcff:fe25:ad47  prefixlen 64  scopeid 0x20<link>
+        ether 2c:56:dc:25:ad:47  txqueuelen 1000  (Ethernet)
+        RX packets 1268514  bytes 1611028865 (1.5 GiB)
+        RX errors 0  dropped 0  overruns 0  frame 0
+        TX packets 396222  bytes 65965632 (62.9 MiB)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 </code>
@@ Line 162: / Line 182: @@
 ==== net/core/dev_ioctl.c ====
+This is how ''ifconfig'' gets its info -- via ''dev_get_flags()'' and ioctl command ''SIOCGIFFLAGS'':
 <code>