group.of.nepali.translators team mailing list archive

[Dan Streetman <dan.streetman@xxxxxxxxxxxxx>]

As the comment says in the vlan if-up script, this setting has nothing
to do with vlans and really should go into ifupdown itself; it makes no
sense for the setting to only work if the 'vlan' package is installed
(and it will work for vlan and non-vlan interfaces as long as 'vlan' is
installed).

However, since this is 'how it has always worked' with ifupdown and
nobody has complained, and ifupdown is riding into the sunset, it makes
no sense to do more than the minimum to fix this.  I'll make the tweak
to the vlan if-up script and leave it at that.

** Bug watch added: Debian Bug tracker #736207
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=736207

** Also affects: vlan (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=736207
   Importance: Unknown
       Status: Unknown

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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:
  In Progress
Status in vlan source package in Trusty:
  In Progress
Status in vlan source package in Xenial:
  In Progress
Status in vlan source package in Zesty:
  In Progress
Status in vlan package in Debian:
  Unknown

Bug 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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