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Virtual Private Networks (VPNs) 4-25
For PPTP negotiation to work, TCP packets inbound and outbound destined for por t 1723 must be allowed.
Likewise, for ATMP negotiation to work, UDP packets inbound and outbound destined for por t 5150 must be
allowed. Source por ts are dynamic, so, if possible, make this flexible, too. Additionally, PPTP and ATMP both
require a firewall to allow GRE bi-directionally.
Likewise, for ATMP negotiation to work, UDP packets inbound and outbound destined for por t 5150 must be
allowed. Source por ts are dynamic, so, if possible, make this flexible, too. Additionally, PPTP and ATMP both
require a firewall to allow GRE bi-directionally.
The following sections illustrate a sample filtering setup to allow either PPTP or ATMP traffic to cross a firewall:
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Make your own appropriate substitutions. For more information on filters and firewalls, see
.