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MAPPING-CYBERSPACE  July 2004

MAPPING-CYBERSPACE July 2004

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Subject:

Re: Traceroute and firewalls

From:

SteveC <[log in to unmask]>

Reply-To:

SteveC <[log in to unmask]>

Date:

Wed, 28 Jul 2004 18:09:43 +0100

Content-Type:

text/plain

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* Andrew Young ([log in to unmask]) wrote:
> Dear all
>
> For the last few years, I have set my students an assignment to use
> ping/traceroute to look at routes and performance to various places on the
> Internet, draw annotated maps, and reach various conclusions. They have
> always found it very interesting.
>
> For the last year I have been fighting with various packet filters that
> have been stopping me doing this. I have now reached an impasse and can't
> get traceroute to work at all (I have tried ICMP, UDP or TCP based
> versions).

TCP being lft? (see below)

> As ping still works, it seems to me that my University (or their ISP) are
> filtering the "TTL Exceeded" reply. I am trying to get them to remove this,
> but I need a fallback position in case they won't.

Thats strange.

> Does anyone have any ideas for other equivalent things I can do that aren't
> so susceptible to firewall interference.

Try lft

http://www.mainnerve.com/lft/

have fun,

SteveC [log in to unmask] http://www.fractalus.com/steve/

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