know if someone ping me

Alex Martelli aleax at aleax.it
Thu Aug 23 15:48:50 CEST 2001


"Markus Schaber" <markus at schabi.de> wrote in message
news:1777401.ESeGDPOM1B at lunix.schabi.de...
> Hi,
>
> noprianto <opennopri at yahoo.com> schrub:
>
> > How do i know if someone ping my system ?
>
> Oh, well, "ping" in what sense?
>
> - CIMP echo request message?
> - ARP "ping" (address request)?
> - IRC Ping?
> - UDP Echo Message (port 7)?
> - TCP  faked package "ping" (provokes a reset)?
> - TCP Keepalive Messages?
>
> or something else I don't remember?
>
> And what has this to do with python?

Very little, I guess, at least for ICMP
pings.

> And why do you want to know?

Presumably the original poster wants to keep an
eyes on such happenings -- but ICMP Echo Request
doesn't get to applications (including Python
ones) on many apps, but is resolved within the
lower-levels of the TCP/IP stack in many
architectures I know.

Logging any or all such events is quite feasible
with iptables on Linux 2.4.* (and you can also
pass packets to a user-space application, so you
MIGHT be able to use some Python here:-), but I
wouldn't know where to start on any form of
Windows, for example (and I'm supposed to be a
Windows expert:-).


Alex






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