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Re: [v6ops] [Technical Errata Reported] RFC4890 (3985)

"Fred Baker (fred)" <fred@cisco.com> Thu, 15 May 2014 03:25 UTC

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From: "Fred Baker (fred)" <fred@cisco.com>
To: Elwyn Davies <elwynd@dial.pipex.com>, Mohacsi Janos <mohacsi@niif.hu>, "jamesrobertson@live.com" <jamesrobertson@live.com>
Thread-Topic: [Technical Errata Reported] RFC4890 (3985)
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Date: Thu, 15 May 2014 03:25:34 +0000
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Subject: Re: [v6ops] [Technical Errata Reported] RFC4890 (3985)
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Guys:

Do we agree with this?

On May 13, 2014, at 5:07 PM, RFC Errata System <rfc-editor@rfc-editor.org> wrote:

> The following errata report has been submitted for RFC4890,
> "Recommendations for Filtering ICMPv6 Messages in Firewalls".
> 
> --------------------------------------
> You may review the report below and at:
> http://www.rfc-editor.org/errata_search.php?rfc=4890&eid=3985
> 
> --------------------------------------
> Type: Technical
> Reported by: James Robertson <jamesrobertson@live.com>
> 
> Section: Appendix B
> 
> Original Text
> -------------
> 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 $inner_prefix \
>         --icmpv6-type ttl-zero-during-transit -j ACCEPT
>  done
> fi
> 
> Corrected Text
> --------------
> if [ "$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.
> 
> Instructions:
> -------------
> This errata is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party (IESG)
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC4890 (draft-ietf-v6ops-icmpv6-filtering-recs-03)
> --------------------------------------
> Title               : Recommendations for Filtering ICMPv6 Messages in Firewalls
> Publication Date    : May 2007
> Author(s)           : E. Davies, J. Mohacsi
> Category            : INFORMATIONAL
> Source              : IPv6 Operations
> Area                : Operations and Management
> Stream              : IETF
> Verifying Party     : IESG

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