[Bug 1467073] [NEW] improve feedback of ip route add nat command failure

[Karl-Philipp Richter]

Public bug reported:

Support for `nat` routes has been dropped in 2.6 according to `man ip
route`, yet invoking `sudo ip route add nat 192.168.178.30 via
192.168.179.1` prints `RTNETLINK answers: Invalid argument` which should
be `support for adding NAT routes has been dropped in Linux 2.6, see
'man ip route' for more details. Consider using [the alternative to nat
routes] instead` because there's no sense in giving less feedback than
possible.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: iproute2 3.16.0-2ubuntu1
Uname: Linux 4.0.5-040005-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
Date: Sat Jun 20 12:20:55 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-20 (60 days ago)
InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: iproute2
UpgradeStatus: Upgraded to vivid on 2015-04-24 (56 days ago)

** Affects: iproute2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1467073

Title:
  improve feedback of ip route add nat command failure

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