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Re: Python Script for Colorizing Traceroute Output (apologies for top-post)

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References <6ea528f6-e4c2-4da9-a011-d81f13b83d28@googlegroups.com> <mailman.3774.1353175657.27098.python-list@python.org> <roy-EFAEEF.13385317112012@news.panix.com>
Date Sun, 18 Nov 2012 05:45:57 +1100
Subject Re: Python Script for Colorizing Traceroute Output (apologies for top-post)
From Chris Angelico <rosuav@gmail.com>
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On Sun, Nov 18, 2012 at 5:38 AM, Roy Smith <roy@panix.com> wrote:
> In article <mailman.3774.1353175657.27098.python-list@python.org>,
>  wrw@mac.com wrote:
>> Don't forget that most firewalls don't decrement) the time-to-live number,
>> and unless you REALLY know what to look for, are invisible.
>
> Interesting.  If the firewall doesn't decrement TTL (a particular nasty
> thing to do, and thus completely expected of a firewall) what REALLY
> knowledge would enable you to detect its presence in a traceroute
> printout at all?

If it's a router, then it definitely should be decrementing TTLs,
though if the firewall is simply a part of another hop, you won't
notice it specifically. What's more common, though, is devices that
decrement TTL and drop packets but don't send back Time Exceeded
messages, giving the classic "* * *" line. I'm not sure if that's what
was being referred to, though. (And they aren't necessarily
firewalls.)

ChrisA

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Thread

Python Script for Colorizing Traceroute Output Jordan Bylsma <jordan.bylsma1@gmail.com> - 2012-11-17 07:04 -0800
  Re: Python Script for Colorizing Traceroute Output garabik-news-2005-05@kassiopeia.juls.savba.sk - 2012-11-17 15:18 +0000
  Re: Python Script for Colorizing Traceroute Output wrw@mac.com - 2012-11-17 12:06 -0500
  Re: Python Script for Colorizing Traceroute Output (apologies for top-post) wrw@mac.com - 2012-11-17 12:07 -0500
    Re: Python Script for Colorizing Traceroute Output (apologies for top-post) Roy Smith <roy@panix.com> - 2012-11-17 13:38 -0500
      Re: Python Script for Colorizing Traceroute Output (apologies for top-post) Chris Angelico <rosuav@gmail.com> - 2012-11-18 05:45 +1100
        Re: Python Script for Colorizing Traceroute Output (apologies for top-post) Jordan Bylsma <jordan.bylsma1@gmail.com> - 2012-11-17 11:59 -0800
          Re: Python Script for Colorizing Traceroute Output (apologies for top-post) Chris Angelico <rosuav@gmail.com> - 2012-11-18 09:00 +1100
            Re: Python Script for Colorizing Traceroute Output (apologies for top-post) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-18 01:18 +0000
              Re: Python Script for Colorizing Traceroute Output (apologies for top-post) Chris Angelico <rosuav@gmail.com> - 2012-11-18 12:27 +1100
        Re: Python Script for Colorizing Traceroute Output (apologies for top-post) Jordan Bylsma <jordan.bylsma1@gmail.com> - 2012-11-17 11:59 -0800

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