Hello,

it's not at all unexpected that ifconfig croaks on things that aren't
compatible with Linux 2.0 (NET-3, I think it was called).  With the
introduction of Linux 2.2 and all the new fancy network features it
supported, the net-tools package (ifconfig, route, etc.) was deprecated
in favour of iproute which supported all the new stuff.  So I think the
paragraph in the manual page is accurate, it's not a must unless you
need to preserve compability with Linux 2.0.  There's a host of other
stuff that will only work on kernels 2.2 and above and that can only be
controlled by the tools in the iproute2 package, for example "ip rule",
"ip route [...] table NNN", and of course, these labels that makes use
of the relaxed syntax rules.

I really wonder why so many distributions still ship the deprecated net-
tools package.  It hasn't seen developement in seven years...  But I
digress.

Anyway, I disagree with you in closing bug #55020, LaMont.  These
labeled addresses have been perfectly valid since 1999 (when Linux 2.2
was first released), and that Postfix and Nmap still croaks on
encountering them should by now be considered a bug, in my opinion.
Most other applications have no problem with such labels.

Tore

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iproute fails to enforce rules on labels
https://bugs.launchpad.net/bugs/225997
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