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monitoring modem activity on ppp
I am using a 56k dial-up modem, through a firewall, on a single user machine. I'm sure that there must be straightforward answer to this, but googling hasn't produced any results, but that could be because of the search terms I am using. Anyway, if anyone has any ideas, those would be appreciated.
From time-to-time I notice that my modem indicator lights on my desktop are active (i.e. green) even though - as far as I can tell - I have no reason to be sending/receiving data from the Net: no emails are being checked, no files downloaded, nor web-pages being retrieved. While I do have automatic checks from email clients to the POP servers to see if there is new mail, the regularity of the modem activity is not explained by this alone. I appreciate some of this might be attributable to ordinary keep-alive packets being sent/received, but what I would really like to know is this: <i>how do I check to see what is coming/going through the modem at any given time</i>? Is there a way to determine the source/destination of these non-deliberate modem activities?
Being a slightly paranoid puppy, I scan my system regularly with rootkithunter and checkrootkit and so far, all comes back nice and clean. I also have not been able to determine anything from the logs, but there is also a good chance that - as an uninitiated person - I am not certain what I am looking for/at. I don't have Snort/AIDE installed, although recognise that the price of learning how to configure the Pig may well prove a good investment in the long run, but that will have to wait until I do a fresh installation and can do it from scratch.
I acknowledge that I might be getting anxious for no good reason, but I'd like to be able to put my mind to rest by being a little more clued up as to the nature, source and destination of any packets passing through my modem ... regardless of their direction.
Any clues?
TIA
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