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)
Thank you for taking the time to report this bug and helping to make Ubuntu better.
This report should probably be verified upstream and then sent there, as it doesn't make sense for Ubuntu to diverge from other distributions on this.