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	<title>Networknet.nl &#187; pptp</title>
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		<title>Cisco: how to setup Windows PPTP VPN server port forwarding on PIX?</title>
		<link>http://www.networknet.nl/apps/wp/archives/402</link>
		<comments>http://www.networknet.nl/apps/wp/archives/402#comments</comments>
		<pubDate>Wed, 19 Mar 2008 20:26:32 +0000</pubDate>
		<dc:creator>Ivan Versluis</dc:creator>
				<category><![CDATA[Cisco]]></category>
		<category><![CDATA[forwarding]]></category>
		<category><![CDATA[nat]]></category>
		<category><![CDATA[pix]]></category>
		<category><![CDATA[port]]></category>
		<category><![CDATA[pptp]]></category>
		<category><![CDATA[static]]></category>

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		<description><![CDATA[In the following example I am configuring port forwarding to a Windows Server 2003 PPTP VPN server. My lab has been configured as shown in the diagram. I have a /28 network registered on the Internet and 14 public IP Addresses are available though the ISP uplink. The SDSL modem is providing these IP addresses by the internal DHCP server. For the Cisco PIX 501 firewall I am using manual assigned Public IP Address. How to configure PPTP VPN server publishing on a Cisco PIX 501 firewall? In the CLI command below I am configuring static NAT to a public IP Address for tcp port 1723 (pptp). I am also allowing the tcp and gre traffic to the VPN server by using access-list. fixup protocol pptp 1723 name 192.168.5.35 VPN-02 pdm location VPN-02 255.255.255.255 inside static (inside,outside) tcp 194.0.0.2 pptp VPN-02 pptp netmask 255.255.255.255 0 0 access-list outside_access_in permit tcp any host 194.0.0.2 access-list outside_access_in permit gre any host 194.0.0.2 What did I achieve with this configuration? After I applied this configuration I was able to connect from my Windows XP &#38; Windows Vista computers by utilizing the built-in VPN client via the PPTP protocol. I configured static port forwarding on tcp 1723 port and enabled the GRE IP protocol fix by using the &#8220;fixup protocol pptp 1723&#8243; command. Without the fixup for pptp protocol I am forced to translate complete internal host (VPN-02) and using all TCP ports. If you don&#8217;t apply to fixup than you probably will get ...]]></description>
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		<title>Cisco: how to publish Windows 2003 PPTP VPN Server on PIX?</title>
		<link>http://www.networknet.nl/apps/wp/archives/338</link>
		<comments>http://www.networknet.nl/apps/wp/archives/338#comments</comments>
		<pubDate>Fri, 18 Jan 2008 18:05:27 +0000</pubDate>
		<dc:creator>Ivan Versluis</dc:creator>
				<category><![CDATA[Cisco]]></category>
		<category><![CDATA[1723]]></category>
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		<category><![CDATA[47]]></category>
		<category><![CDATA[501]]></category>
		<category><![CDATA[721]]></category>
		<category><![CDATA[gre]]></category>
		<category><![CDATA[pix]]></category>
		<category><![CDATA[pptp]]></category>
		<category><![CDATA[vpn]]></category>

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		<description><![CDATA[I installed a Windows 2003 PPTP/L2TP VPN server. After the server installation I started testing the communication by creating a VPN connection. The first error I got while connecting was &#8220;Disconnected. Error 721: The remote computer did not respond&#8220;. The Windows XP client is running as a VMWare virtual machine and the VPN server is published behind a Cisco PIX 501 firewall. I checked the VPN server and there I saw the error message below. I verified the NAT configuration and a static NAT rule was configured based on a private and public ip address translation. ACL was there for  &#8216;any&#8217; tcp communication and I added second ACL for IP Protocol 47 (GRE). I logged on my Windows Vista Enterprise client and recreated the same VPN connection. The Vista client was connected to my ADSL modem with a wireless connection and it had direct connection to the VPN server. The Windows XP virtual machine was sitting behind the Cisco PIX. I figured out something was missing on my firewall configuration. How to allow PPTP protocol on a Cisco PIX firewall? pixfirewall# conf t pixfirewall(config)#fixup protocol pptp 1723 pixfirewall# wr mem Adding the &#8220;fixup protocol pptp 1723&#8243; to my configuration let the Cisco PIX firewall know how successfully setup a PPTP connection. References Permitting PPTP/L2TP Connections Through the PIX/ASA/FWSM &#160;]]></description>
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