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This bug was fixed in the package vlan - 1.9-3ubuntu10.5

---------------
vlan (1.9-3ubuntu10.5) trusty; urgency=medium

  * Allow ip-rp-filter to be 0, 1, or 2 instead of only 0 or 1
    (LP: #1716964)

 -- Dan Streetman <dan.streetman@xxxxxxxxxxxxx>  Wed, 20 Sep 2017
09:30:21 -0400

** Changed in: vlan (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1716964

Title:
  VLAN network script if-up.d/ip limits rp_filter value to 0 or 1

Status in vlan package in Ubuntu:
  Fix Released
Status in vlan source package in Trusty:
  Fix Released
Status in vlan source package in Xenial:
  Fix Released
Status in vlan source package in Zesty:
  Fix Committed
Status in vlan source package in Artful:
  Fix Released
Status in vlan package in Debian:
  New

Bug description:
  [impact]

  Using ifupdown, vlan supported setting an interface's rp-filter value,
  but that can only set 0 or 1, but it cannot be set to 2.

  [test case]

  On any system using ifupdown to manage interfaces, add to an
  interface's config:

  if-rp-filter 2

  When the interface is brought up, its /proc/sys/net/ipv4/conf/$IFACE/rp_filter value will be set to 1 instead of 2.  With the fixed vlan package, its value will correctly be set to 2.
  See also c#9 for a test example

  [regression potential]

  problems with this change could affect the value of an interface's
  rp_filter value.

  [other]

  the upstream debian bug for this has been open for 3 years without
  change, so it is unlikely debian will fix this.

  As outlined in c#4 and c#13 this setting is vlan not generally
  required for vlans (but often used with them). So it in question if
  eventually it should be added elsewhere and removed here, but for the
  SRU the bug is where it is (in the vlan package) and there it has to
  be fixed.

  ---

  [original description]

  When configuring a VLAN interface on /etc/network/interfaces, setting
  the ip-rp-filter value to 2 (loose mode reverse filtering) gets
  overridden by the /etc/network/if-up.d/ip script, which only allows
  for values 0 and 1.

  This is the relevant configuration in /etc/network/interfaces

  # The primary network interface
  auto eno1
  iface eno1 inet static
   address 10.1.2.36
   netmask 255.255.0.0
   gateway 10.1.1.2
   dns-search xxx.yy
   dns-nameservers 10.1.2.22 10.1.2.24

  # The administrative network
  auto eno1.2
  iface eno1.2 inet static
   address 172.16.1.8
   netmask 255.255.0.0
   ip-rp-filter 2
   vlan-raw-device eno1

  But it does not get correctly set

  ~# cat /proc/sys/net/ipv4/conf/eno1.2/rp_filter
  1

  And this is the script overriding the configuration

  ~# cat /etc/network/if-up.d/ip
  #!/bin/sh
  # This should probably go into ifupdown
  # But usually only those with lots of interfaces (vlans) need these
  if [ -d "/proc/sys/net/ipv4/conf/$IFACE" ]
  then
   if [ -n "$IF_IP_PROXY_ARP" ]; then
    if [ "$IF_IP_PROXY_ARP" -eq "1" ]; then
     echo 1 > "/proc/sys/net/ipv4/conf/$IFACE/proxy_arp"
    else
     echo 0 > "/proc/sys/net/ipv4/conf/$IFACE/proxy_arp"
    fi
   fi
   if [ -n "$IF_IP_RP_FILTER" ]; then
    if [ "$IF_IP_RP_FILTER" -eq "0" ]; then
     echo 0 > "/proc/sys/net/ipv4/conf/$IFACE/rp_filter"
    else
     echo 1 > "/proc/sys/net/ipv4/conf/$IFACE/rp_filter"
    fi
   fi
  fi

  It checks if $IF_IP_RP_FILTER is 0 and sets it as 0, otherwise sets it
  as 1, so it never allows to set is to 2 (loose mode).

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