Firewall Wizards: Re: ICMP destination unreachable messages

[Chunduru Rama Krishna Prasad <rkp () intotoinc com>]

Hi all,

      A. Find out the original connection session from ICMP error message.
      B. Do some checks, make sure the number of ICMP error messages are
           less than the packets sent out.
      C. Do rate limiting.
      Maintaing original IP identification numbers for matching with ICMP inner
      ip header IDs may be too much of processing and might require good storage.



Max Enders wrote:

> Hello,
>
> I'm curious to know how firewalls handle duplicate ICMP destination unreachable messages. How should replayed packets 
> be denied? It seems like the two best options are rate limiting and inspecting the IPID. Any information is appreciated.
>
> Thanks,
> Max Enders
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>  

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