PPTP/GRE Open Port on firewall

PPTP/GRE Open Port on firewall

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Subject Author Date
PPTP/GRE Open Port on firewall Peter Harding 11-15-2004
Posted by Peter Harding on November 15, 2004, 2:58 am
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Hi,

We have mobile users who access the Internet using GPRS cards. They
want to access their office network using a VPN connection. From the
office side there is a Linux firewall which only allows users in on
fixed IP addresses using PPTP (GRE) protocol. What are the dangers of
opening up this port (1723 I think?) to allow anyone in (as long as
they have a userid and password). This would then allow the mobile
users access on un-fixed IP addresses on the GPRS cards.

Is there a safer way to do this?

Thanks.


Posted by Leythos on November 15, 2004, 11:35 am
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peterharding@yahoo.com says...
> Hi,
>
> We have mobile users who access the Internet using GPRS cards. They
> want to access their office network using a VPN connection. From the
> office side there is a Linux firewall which only allows users in on
> fixed IP addresses using PPTP (GRE) protocol. What are the dangers of
> opening up this port (1723 I think?) to allow anyone in (as long as
> they have a userid and password). This would then allow the mobile
> users access on un-fixed IP addresses on the GPRS cards.
>
> Is there a safer way to do this?

If your RAS box is secure, and the users have a strong key, it's one of
the most common VPN methods out there. With the exception of weak
passwords you should not have any problems.

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