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    "Time Exceeded" & "Parameter Problem" Not in 2.4.4 Default Allow?

    Firewalling
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    • beremonavabiB
      beremonavabi
      last edited by beremonavabi

      According to:

      https://tools.ietf.org/html/rfc4890#section-4.3.1

      4.3.1. Traffic That Must Not Be Dropped

      Error messages that are essential to the establishment and

      maintenance of communications:

      o Destination Unreachable (Type 1) - All codes

      o Packet Too Big (Type 2)

      o Time Exceeded (Type 3) - Code 0 only

      o Parameter Problem (Type 4) - Codes 1 and 2 only

      Yet, according to:

      https://github.com/pfsense/pfsense/blob/75cf92ffe93c7ea71cd5b432c369860b6e66a0d3/src/etc/inc/filter.inc#L3297

      the Time Exceeded (Type 3) and Parameter Problem (Type 4) - Codes 1 and 2 are not being allowed by pfSense 2.4.4 in the default allow rule. Should they be?

      EDIT: I guess while I'm here I'll also ask about the missing parts of Neighbor Discovery. According to that same document, Neighbor Discovery consists of 7 message types:

      " o Router Solicitation (Type 133)
      o Router Advertisement (Type 134)
      o Neighbor Solicitation (Type 135)
      o Neighbor Advertisement (Type 136)
      o Redirect (Type 137)
      o Inverse Neighbor Discovery Solicitation (Type 141)
      o Inverse Neighbor Discovery Advertisement (Type 142)"

      Most of the few things I've read on this don't mention the Inverse ones. For instance, this one doesn't talk about them:

      https://tools.ietf.org/html/rfc3971

      But, since pfSense's default ICMPv6 rules specifically allow router and neighbor solicitation and advertisement, why not the others (i.e., specifically, Redirect - but also the two Inverse ones)?

      SG-4860, pfSense 2.4.5-RELEASE-p1 (amd64)

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