[vpn] VPN and firewall question

Christopher Gripp cgripp at axcelerant.com
Tue Oct 9 16:16:41 EDT 2001

Just because the only route the PC has while running the VPN client is
the corp firewall doesn't mean the PC at home is protected by the corp
firewall. That is the old 'if I can't see you, you can't see me' theory
and it sucks.

f it has an Internet connection then it is susceptible to attacks from
others on the Internet.  Period.

A personal FW, software or hardware, is a MUST if you care about being
hacked or DoS'd.  The assumption that there is no way to hack a PC
running a VPN client is not a safe one to make.  You have to consider
the potential risk of information that resides locally on that remote
system.  It isn't necessarily about being able to gain access to the
corporate network as much as obtaining sensitive data from the
compromised PC.  That could be in the form of accounting spreadsheets,
contact lists or any number of proprietary and confidential material a
remote user might save on their system.

Christopher Gripp 
Systems Engineer 

-----Original Message-----
From: Mason, David [mailto:David_Mason at NAI.com]
Sent: Tuesday, October 09, 2001 11:22 AM
To: 'Hari Kannan'; vpn at securityfocus.com
Cc: hkannan at home.com
Subject: RE: [vpn] VPN and firewall question

I would recommend having a personal firewall and virus scanning
installed on
your home computer even if the following two additional security
are in place.

If your home computer ALWAYS goes through the corporate firewall for ALL
traffic then your home computer will generally be as safe as any
that resides within the corporate network (depending on the corporate
firewall and how it's setup to handle traffic between the VPN client and
Internet).  This setup is sometimes referred to as exclusive gateway -
corporate firewall is the client's one and only route for all traffic.

Some firewalls give the administrator the ability to do virus scanning
perform other security precautions on the VPN traffic to and from the


-----Original Message-----
From: Hari Kannan [mailto:hari_kannan at hotmail.com]
Sent: Monday, October 08, 2001 8:01 PM
To: vpn at securityfocus.com
Cc: hkannan at home.com
Subject: [vpn] VPN and firewall question


I was hoping if someone would be able to answer this question.

I have cable modem connection at home and also use VPN provided by my 
company to dialin for work related stuff. Will the personal stuff on my
at home be protected by the company's firewall? And, will someone be
able to

use my home PC to hack into the company network? i.e. do I need to buy a

firewall sftware and install at my home PC?


Hari Kannan

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