how do i view what is going through my modem to other pc

[dexter855]

ime not looking for a file to put into the other pcs, i just want to see the information
goin through my modem

[D-cat]

If it's just network traffic you're looking for, the application "wireshark" will log copies of your net packets for a period of time you specify, then you can look through it to see what traffic there has been. This is available from the repos.

If you're looking to see raw serial traffic (like looking for modem command responses), I found some possibilities:
interceptty
sersniff - Programs - Project Purple
SourceForge.net: Serial line sniffer

I didn't find any of these in the repos, but they shouldn't be too difficult to compile. I hope I answered your question.