RFC 4890, "Recommendations for Filtering ICMPv6 Messages in Firewalls", May 2007

Errata ID: 3985
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: James Robertson
Date Reported: 2014-05-13
Verifier Name: Joel Jaeggli
Date Verified: 2014-05-19

Section Appendix B says:

if [ "$STATE_ENABLED" -eq "1" ]
then
  # Allow incoming time exceeded code 0 messages
  # only for existing sessions
  for inner_prefix in $INNER_PREFIXES
  do
    ip6tables -A icmpv6-filter -m state -p icmpv6 \
         -d $inner_prefix \
         --state ESTABLISHED,RELATED --icmpv6-type packet-too-big \
         -j ACCEPT
  done
else
  # Allow incoming time exceeded code 0 messages
  for inner_prefix in $INNER_PREFIXES
  do
    ip6tables -A icmpv6-filter -p icmpv6 -d $inner_prefix \
         --icmpv6-type ttl-zero-during-transit -j ACCEPT
  done
fi

It should say:

if [ "$STATE_ENABLED" -eq "1" ]
then
  # Allow incoming time exceeded code 0 messages
  # only for existing sessions
  for inner_prefix in $INNER_PREFIXES
  do
    ip6tables -A icmpv6-filter -m state -p icmpv6 \
     -d $inner_prefix \
     --state ESTABLISHED,RELATED --icmpv6-type ttl-zero-during-transit \
     -j ACCEPT
  done
else
  # Allow incoming time exceeded code 0 messages
  for inner_prefix in $INNER_PREFIXES
  do
    ip6tables -A icmpv6-filter -p icmpv6 -d $inner_prefix \
         --icmpv6-type ttl-zero-during-transit -j ACCEPT
  done
fi

Notes:

RFC 4890 Errata ID 2706 states that icmpv6-type packet-too-big should
state icmpv6-type ttl-zero-during-transmit. This should read
ttl-zero-during-transit.

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