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Problems with Remote Access VPN 1

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gscheepers

gscheepers

IS-IT--Management
Jan 21, 2002
150
US
Hi Everyone,

I'm having problems with establishing a VPN tunnel to a PIX 525 via the MS client. When I use one of our static addresses that's available from our router, it works fine, but when trying access it from say BT broadband externaly, authentication does not want to take place.

I'd really appreciate your help!

Many Thanks!

Gerhard

Below is the configuration on the 525:

interface ethernet0 auto
interface ethernet1 auto
interface ethernet2 auto shutdown
interface ethernet3 auto shutdown
interface ethernet4 auto shutdown
interface ethernet5 auto shutdown
interface ethernet6 auto shutdown
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 intf2 security4
nameif ethernet3 intf3 security6
nameif ethernet4 intf4 security8
nameif ethernet5 intf5 security10
nameif ethernet6 intf6 security12
enable password <password> encrypted
passwd <password encrypted
hostname londonfirewall
domain-name foundation.net
clock timezone GMT/BST 0
clock summer-time GMT/BDT recurring last Sun Mar 1:00 last Sun Oct 2:00
fixup protocol dns maximum-length 512
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 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
fixup protocol tftp 69
names
name 192.168.6.0 Bristol
access-list compiled
access-list outside-in permit esp any any
access-list outside-in permit icmp any any echo-reply
access-list outside-in permit icmp any any time-exceeded
access-list outside-in permit icmp any any unreachable
access-list outside-in permit tcp any host <external IP> eq www
access-list outside-in permit tcp any host <external IP> eq www
access-list outside-in permit tcp any host <external IP> eq www
access-list outside-in permit tcp any host <external IP> eq ftp
access-list outside-in permit tcp any host <external IP> eq www
access-list outside-in permit tcp any host <external IP> eq ftp
access-list outside-in permit tcp any host <external IP> eq www
access-list outside-in permit tcp any host <external IP> eq ftp
access-list outside-in permit tcp any host <external IP> eq www
access-list outside-in permit tcp any host <external IP> eq smtp
access-list outside-in permit tcp any any eq ssh
access-list outside-in permit udp any any eq isakmp
access-list inside-out deny tcp any any eq 135
access-list inside-out deny tcp any any eq 137
access-list inside-out deny tcp any any eq 138
access-list inside-out deny tcp any any eq netbios-ssn
access-list inside-out deny udp any any eq 135
access-list inside-out deny udp any any eq netbios-ns
access-list inside-out deny udp any any eq netbios-dgm
access-list inside-out deny udp any any eq 139
access-list inside-out permit ip any any
access-list inside_outbound_nat0_acl permit ip 172.16.0.0 255.255.0.0 192.168.100.0 255.255.255.0
access-list inside_outbound_nat0_acl permit ip 172.16.0.0 255.255.0.0 Bristol 255.255.255.0
access-list inside_outbound_nat0_acl permit ip 172.16.0.0 255.255.0.0 192.168.101.0 255.255.255.0
access-list inside_outbound_nat0_acl permit ip 172.16.0.0 255.255.0.0 172.16.253.0 255.255.255.224
access-list 101 permit ip 172.16.0.0 255.255.0.0 192.168.1.0 255.255.255.0
access-list 102 permit ip 172.16.0.0 255.255.0.0 192.168.2.0 255.255.255.0
access-list 103 permit ip 172.16.0.0 255.255.0.0 192.168.3.0 255.255.255.0
access-list outside_cryptomap_50 permit ip 172.16.0.0 255.255.0.0 192.168.100.0 255.255.255.0
access-list outside_cryptomap_70 permit ip 172.16.0.0 255.255.0.0 Bristol 255.255.255.0
access-list outside_cryptomap_90 permit ip 172.16.0.0 255.255.0.0 192.168.101.0 255.255.255.0
pager lines 24
logging console warnings
icmp permit any outside
icmp permit any echo-reply outside
icmp permit any time-exceeded outside
mtu outside 1500
mtu inside 1500
mtu intf2 1500
mtu intf3 1500
mtu intf4 1500
mtu intf5 1500
mtu intf6 1500
ip address outside 194.193.169.98 255.255.255.0
ip address inside 172.16.254.1 255.255.0.0
ip address intf2 127.0.0.1 255.255.255.255
no ip address intf3
no ip address intf4
no ip address intf5
no ip address intf6
ip verify reverse-path interface outside
ip audit info action alarm
ip audit attack action alarm
ip local pool VPN 172.16.253.1-172.16.253.30
no failover
failover timeout 0:00:00
failover poll 15
no failover ip address outside
no failover ip address inside
no failover ip address intf2
no failover ip address intf3
no failover ip address intf4
no failover ip address intf5
no failover ip address intf6
pdm location 172.16.0.0 255.255.0.0 outside
pdm location 172.16.1.235 255.255.255.255 inside
pdm location 172.16.196.101 255.255.255.255 inside
pdm location 172.16.196.104 255.255.255.255 inside
pdm location 172.16.196.112 255.255.255.255 inside
pdm location 172.16.196.113 255.255.255.255 inside
pdm location 172.16.196.114 255.255.255.255 inside
pdm location 172.16.196.121 255.255.255.255 inside
pdm location 80.225.197.33 255.255.255.255 outside
pdm location 192.168.1.0 255.255.255.0 outside
pdm location 192.168.2.0 255.255.255.0 outside
pdm location 192.168.3.0 255.255.255.0 outside
pdm location 192.168.100.0 255.255.255.0 outside
pdm location Bristol 255.255.255.0 outside
pdm location 192.168.101.0 255.255.255.0 outside
pdm location 172.16.253.0 255.255.255.224 outside
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 172.16.0.0 255.255.0.0 0 0
static (inside,outside) tcp interface smtp 172.16.1.235 smtp netmask 255.255.255.255 0 0
static (inside,outside) <external IP> 172.16.196.112 netmask 255.255.255.255 0 0
static (inside,outside) <external IP> 172.16.196.104 netmask 255.255.255.255 0 0
static (inside,outside) <external IP> 172.16.196.113 netmask 255.255.255.255 0 0
static (inside,outside) <external IP> 172.16.196.121 netmask 255.255.255.255 0 0
static (inside,outside) <external IP> 172.16.196.114 netmask 255.255.255.255 0 0
static (inside,outside) <external IP> 172.16.196.101 netmask 255.255.255.255 0 0
access-group outside-in in interface outside
access-group inside-out in interface inside
route outside 0.0.0.0 0.0.0.0 <external GW IP> 1
timeout xlate 3:00:00
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
ntp server 195.13.1.153 source outside
http server enable
http 172.16.0.0 255.255.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
sysopt connection permit-pptp
sysopt ipsec pl-compatible
crypto ipsec transform-set traffic esp-des esp-md5-hmac
crypto map ethnicmap 10 ipsec-isakmp
crypto map ethnicmap 10 match address 101
crypto map ethnicmap 10 set peer <external IP>
crypto map ethnicmap 10 set transform-set traffic
crypto map ethnicmap 20 ipsec-isakmp
crypto map ethnicmap 20 match address 103
crypto map ethnicmap 20 set peer <external IP>
crypto map ethnicmap 20 set transform-set traffic
crypto map ethnicmap 30 ipsec-isakmp
crypto map ethnicmap 30 match address 102
crypto map ethnicmap 30 set peer <external IP>
crypto map ethnicmap 30 set transform-set traffic
crypto map ethnicmap 50 ipsec-isakmp
crypto map ethnicmap 50 match address outside_cryptomap_50
crypto map ethnicmap 50 set peer <external IP>
crypto map ethnicmap 50 set transform-set traffic
crypto map ethnicmap 70 ipsec-isakmp
crypto map ethnicmap 70 match address outside_cryptomap_70
crypto map ethnicmap 70 set peer <external IP>
crypto map ethnicmap 70 set transform-set traffic
crypto map ethnicmap 90 ipsec-isakmp
crypto map ethnicmap 90 match address outside_cryptomap_90
crypto map ethnicmap 90 set peer <external IP>
crypto map ethnicmap 90 set transform-set traffic
crypto map ethnicmap interface outside
isakmp enable outside
isakmp key ******** address <external IP> netmask 255.255.255.255
isakmp key ******** address <external IP> netmask 255.255.255.255
isakmp key ******** address <external IP> netmask 255.255.255.0
isakmp key ******** address <external IP> netmask 255.255.255.0
isakmp key ******** address <external IP> netmask 255.255.255.255 no-xauth no-config-mode
isakmp key ******** address <external IP> netmask 255.255.255.255 no-xauth no-config-mode
isakmp policy 1 authentication pre-share
isakmp policy 1 encryption des
isakmp policy 1 hash md5
isakmp policy 1 group 1
isakmp policy 1 lifetime 86400
isakmp policy 21 authentication pre-share
isakmp policy 21 encryption des
isakmp policy 21 hash md5
isakmp policy 21 group 2
isakmp policy 21 lifetime 86400
telnet 172.16.0.0 255.255.0.0 inside
telnet 172.16.0.0 255.255.0.0 intf2
telnet 172.16.0.0 255.255.0.0 intf3
telnet 172.16.0.0 255.255.0.0 intf4
telnet 172.16.0.0 255.255.0.0 intf5
telnet 172.16.0.0 255.255.0.0 intf6
telnet timeout 5
ssh 80.225.197.33 255.255.255.255 outside
ssh timeout 5
management-access outside
console timeout 0
vpdn group PPTP-VPDN-GROUP accept dialin pptp
vpdn group PPTP-VPDN-GROUP ppp authentication pap
vpdn group PPTP-VPDN-GROUP ppp authentication chap
vpdn group PPTP-VPDN-GROUP ppp authentication mschap
vpdn group PPTP-VPDN-GROUP ppp encryption mppe 40 required
vpdn group PPTP-VPDN-GROUP client configuration address local VPN
vpdn group PPTP-VPDN-GROUP client configuration dns 172.16.1.1 172.16.1.11
vpdn group PPTP-VPDN-GROUP client configuration wins 172.16.1.1 172.16.1.11
vpdn group PPTP-VPDN-GROUP pptp echo 60
vpdn group PPTP-VPDN-GROUP client authentication local
vpdn username <username> password *********
vpdn username <username> password *********
vpdn username <username> password *********
vpdn enable outside
username <username> password <password> encrypted privilege 15
vpnclient server 172.16.254.1
vpnclient mode client-mode
vpnclient vpngroup VPN password ********
terminal width 80
 
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You need to enable NAT-T (NAT Traversal) on the PIX:

isakmp nat-traversal

The problem is some NAT devices cannot handle the ESP protocol, so you need to use NAT-T in order to encapsulate the ESP protocol on a UDP packet.
 
Upvote 0 Downvote
Tried this, but still no luck. Any other ideas?

Thanks!
 
Upvote 0 Downvote
Got to work - thanks for the help! It started working after a reload.
 
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