[Bug 1382295] [NEW] installer won't accept link-local v6 gateway address

[James A. T. Rice]

Public bug reported:

In the 14.04LTS server install network configuration, an IP address of
"2001:db8::2/64" is accepted as expected.

However attempting to set a gateway of "fe80::1" returns
"Unreachable gateway
The gateway address you entered is unreachable.
You may have made an error entering your IP address, netmask and/or
gateway."

The expected response would be for it accept the gateway, which it does
with a gateway of "2001:db8::1".

Unreachable gateway is also returned for other out-of-subnet addresses,
e.g. "2001:db8:1::1", so I suspect that the out-of-subnet check needs to
be bypassed when link local (fe80::/64) gateways are used.

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

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https://bugs.launchpad.net/bugs/1382295

Title:
  installer won't accept link-local v6 gateway address

Status in “netcfg” package in Ubuntu:
  New

Bug description:
  In the 14.04LTS server install network configuration, an IP address of
  "2001:db8::2/64" is accepted as expected.

  However attempting to set a gateway of "fe80::1" returns
  "Unreachable gateway
  The gateway address you entered is unreachable.
  You may have made an error entering your IP address, netmask and/or
  gateway."

  The expected response would be for it accept the gateway, which it
  does with a gateway of "2001:db8::1".

  Unreachable gateway is also returned for other out-of-subnet
  addresses, e.g. "2001:db8:1::1", so I suspect that the out-of-subnet
  check needs to be bypassed when link local (fe80::/64) gateways are
  used.

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