Public bug reported:
ip-address(8) manpage states:
label NAME
Each address may be tagged with a label string. In order to preserve
compatibility with Linux-2.0 net aliases, this string must coincide with the
name of the device or must be prefixed with the device name followed by colon.
But you can omit the colon, "ip addr add" is ONLY checking the label is
prefixed with the device:
# ip addr add 1.1.1.1 label test1 dev eth0
"dev" (eth0) must match "label" (test1).
# ip addr add 1.1.1.2 label eth0-test2 dev eth0
# ip addr add 1.1.1.3 label eth0:test3 dev eth0
Now ifconfig becomes confused about eth0-test2:
# ifconfig eth0-test2
eth0-test2: error fetching interface information: Device not found
# ifconfig eth0:test3
eth0:test3 Link encap:Ethernet HWaddr b0:d5:cc:fe:1d:7c
inet addr:1.1.1.3 Bcast:0.0.0.0 Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:171
And daemons like ntpd also log errors about the interface with the
illegal label:
ntpd[7570]: eth0-test3: getting interface flags: No such device
## => many of this error per minute until:
ntpd[7570]: Too many errors. Shutting up.
So, I think ip addr show disallow adding address with illegal (as stated by his
own documentation) labels, it must also check for the colon following the dev
name.
Version: 4.3.0-1ubuntu3
** Affects: iproute2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1662620
Title:
"ip addr add" permits illegal labels
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