There are different ways to use it I think. First you need to determin if the modem only needs to dial out of into your network. If the modem is only used to dial out to the legacy system of your network then configure the modem to only allow dial-out.
If you need to use the modem to dialin from an external network or computer then you have several ways. You can isolate the computer behind a firewall but like you said you then need to allow a lot of ports that will result in an pretty open rulebase. You can also have some secure way of authenticating once the user has dialed in. RSA tokens or something like that may be an solution. These are just a few ideas, I bet there are more Regards, Brenno > -----Original Message----- > From: Chris Berry [SMTP:[EMAIL PROTECTED]] > Sent: vrijdag 7 juni 2002 20:08 > To: [EMAIL PROTECTED] > Subject: Modem Security > > > > I think I've got my internet connection security coming together, but > I'm worried about a potential back door. I have one worker who absolutely > > has to have a modem to contact the legacy system our billing service > uses. What bothers me is that someone might get clever and use a war > dialer to find this number and try and hack their way around my secure > gateway. I'd like to make this more difficult or at least have some way > to contain the damage. Does anyone have any ideas? I thought of possibly > > putting a linux box configured as a firewall between her and the rest of > the network, but I'd have to have alot of ports open to allow all the > services she'll need so I don't know if that would even help much.
