On Tue, Sep 19, 2000 at 11:00:57AM +0200, Leif Neland wrote:
> If I understand correctly, traceroute works by sending pings with ttl=1,
> ttl=2,ttl=3 etc and records the names of the routers where the ttl reaches
> zero.
>
> However, an increasing number of sites believes in security by obscurity,
> and blocks for pings.
traceroute doesn't use pings. mtr does.
> Would the same technique work for making a telnet to port 80 with ttl=1,
> ttl=2 etc?
traceroute currently uses UDP in a similar way, and a SYN ping (like
nmap does) should be possible too, yes.
The problem is that those sites hinder traceroutes by blocking certain
kinds of *outgoing* ICMP traffic, and there's no way we can work around
that.
Greetz, Peter.
--
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