RE: Modem connection

["David Gillett" <gillettdavid () fhda edu>]

  The "proper" way for this sequence to work is something like

<three seconds no activity>
+++
<three seconds no activity>
ATH0

which would be impossible to send to you over a TCP/IP session.
But the inactivity timing is covered by a Hayes patent, and a 
few cheap modem manufacturers chose not to license the patent.
  I'm surprised to hear that any of these cheap makers survived 
late enough to release a 56K product!  I do think that if you
spent just a couple bucks more on a modem, you wouldn't have 
this problem.

  Assuming, though, that you can't replace the modem with something
that really works, 

> .... Uner linux i found that that 
> command can be disabled via querying the modem. 

  The modem doesn't care what OS you're running.  Having found
the command to disable this behaviour, add it to the dialling 
(or initialization) string you use, so it happens every time
you go online.  End of problem.

David Gillett


> -----Original Message-----
> From: none [mailto:ice4ice () excite com]
> Sent: August 8, 2003 21:43
> To: security-basics () securityfocus com
> Subject: Modem connection
>
>   hi, i'm a simple man, i can't affort anything faster than 
> 56k :>  I'm running XP, with Forton Firewall; the problem i 
> occured that packets can be sent to me with +++ATHO, which 
> will nicelly disconnect me. Uner linux i found that that 
> command can be disabled via querying the modem. Some of the 
> ICMP senders will do it to 135 port; disabling the whole 
> protocol won't do it. We tried it.   I don't think that the 
> firewall is actually catching the packets, before they reach 
> modem :> ,so i'm trapped, trying different software won't 
> help, eg BlackIce didn't help. My mate tried from freeBSD, by 
> going on higher port (cant remember) and disconnecting me, 
> but ip ban solved that. Q. is there an answer to that? i 
> can't setup a hardware firewall, and i need windows to run 
> more often than linux (for the time being.)   Can someone 
> send a link for more info on ICMP? Thanks, and sorry for my 
> poor english.


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