PPTP pass-through with PAT

[BuckWeet]

For all of you fellow pix users that have people that need to VPN out using PPTP and PAT, it is now support in pix 6.3.

You need to permit GRE inbound and then also do this simple command "fixup protocol pptp 1723"

vioala it works, YAY!!!


BuckWeet

 

[netwrkr]

I wouldn't put 6.3 into production use without first testing it. While I run it at home on my 501 without any problems, I did find that the production 515R at work had all kinds of unusal problems. I had to downgrade to 6.2.

 

[mseedii]

what kind of problems with 515R. we have one and just upgraded to 6.3 so i can PPTP. it doesn't work. it connects but is unable to authenticate the password. on the configuration/vpn tab/vpn system options i have the bypass access check for pptp traffic checked.

 

[bwilliam13]

I've been running 6.3 since it was released on a network with about 600 unique internet users...haven't had one problem. We've got VPN inbound, outbound, 2 DMZ's, etc etc. Never even had to do a clear xlate or anything.

 

[yizhar]

HI.

> vioala it works, YAY!!!
As far as I know it supports only a single PPTP session at a time.
Am I right or wrong?
Can you PPTP from 2 or more workstations at the same time via PAT at the pix?


Yizhar Hurwitz

http://come.to/yizhar

http://teachers.sivan.co.il/yizhar

 

[bwilliam13]

Yes, you can PPTP from 2 or more workstations at the same time.

I very regularly have my PC and laptop PPTP'ed from work to my server at home...through two different connections. Connects fine.

 

[Breckar]

Hi everyone. I'm new to Pix and have been struggling to get vpn connectivity going for 2 days. I'm at my wits end and very confused after having tried many things and am not sure if I need to use radius, or just pass thru pptp the the windows 2000 remote access server.

What I'm after is to have our remote staff vpn into the network using their domain name and passwords. My remote access server ip is 192.168.1.2

I'm using 506e with 6.3 and here's my config:
Building configuration...
: Saved
:
PIX Version 6.3(1)
interface ethernet0 auto
interface ethernet1 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password ****** encrypted
passwd ******* encrypted
hostname ***
domain-name ***.com
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol pptp 1723
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
names
access-list acl_out permit icmp any any echo-reply
access-list acl_out permit icmp any any echo
access-list acl_out permit icmp any any time-exceeded
access-list acl_out permit tcp any eq pptp interface outside eq pptp
access-list acl_out permit gre any any
access-list inside_access_in permit ip any any
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside 198.xxx.xxx.230 255.255.255.xxx
ip address inside 192.168.1.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm location 192.168.1.2 255.255.255.255 inside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) tcp interface pptp 192.168.1.2 pptp netmask 255.255.255.255 0 0
access-group acl_out in interface outside
access-group inside_access_in in interface inside
route outside 0.0.0.0 0.0.0.0 198.xxx.xxx.225 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 192.168.1.2-192.168.1.254 inside
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
terminal width 80
Cryptochecksum:x
: end
[OK]

Thanks.

 

[dopehead]

In order for PPTP to work from outside to your ras server, you will prolly need to do a full static one-to-one translation, since gre is not nat'ed in your config.


Change : "static (inside,outside) tcp interface pptp 192.168.1.2 pptp netmask 255.255.255.255 0 0" to

"static (inside,outside) interface 192.168.1.2 netmask 255.255.255.255 0 0"

As far as i remember you can't do a static that is valid for GRE only. But you can look in the cmd ref. for that.



Jan

Network Systems Engineer
CCNA/CQS/CCSP

 

[littlejohnny]

Breckar,if you want to do vpn, you will need to do more configuration. Your'e missing the isakmp,crypto,vpngroup, etc., statements. Go to the CISCO site. There are a gazillion excellent examples you can use.

 

[Breckar]

The first day I almost had this working having setup a RADIUS on my RAS, but I was getting an error on user not valid on domain, sooo close, but try as I may I couldn't get verified. So I gave up on that and tried to do pptp passthru, I now realise this thread was about outbound pptp not inbound, sorry about that.

I've check many, many cisco docs and have seen the ones you are refering to. I was under the impression those were for setting up for many different types of vpn clients. I just want to use the microsoft vpn client, not the cisco one. It would be rather annoying having to deploy a new client to all the remote staff in our organization. If I remember right one of the docs from cisco tells you to look for another document if using the ms client, but I can't find that other document anywhere. I guess it's all a plot to make me take a class or something ;-)

Anyways, pulled out another firewall, configured it for pptp passthru and had people vpn'd to the network in 5 minutes.

Thanks for trying to help a PiX newbie.I've not given up yet, just lost this round.