hi pjain2thanks you so much,

chittisak411 · ‎09-12-2015

i'm a problem after config L2TP on cisco 1841 but cannot work. i'm tried to use any solution but still it same. pls. see config as below and help to check to config, NAT, Routing mistake?

thanks you so much

#################################################################

Router_MAN-WAN#sh run
Router_MAN-WAN#sh running-config
Load for five secs: 7%/0%; one minute: 5%; five minutes: 7%
Time source is NTP, 23:19:32.403 ict Sat Sep 12 2015

Building configuration...

Current configuration : 9051 bytes
!
! Last configuration change at 23:09:29 ict Sat Sep 12 2015
! NVRAM config last updated at 22:37:54 ict Sat Sep 12 2015 by admin
!
version 12.4
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Router_MAN-WAN
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
logging buffered 4096
enable password 7 01100F175804
!
aaa new-model
!
!
aaa authentication ppp VPDN_AUTH local
!
!
aaa session-id common
clock timezone ict 7
dot11 syslog
ip source-route
!
!
no ip dhcp use vrf connected
!
ip dhcp pool VLAN100
   network 192.168.20.0 255.255.255.0
   domain-name XXXXX.wifi
   default-router 192.168.20.1
   dns-server XXXX.XXXX
   lease 7
!
ip dhcp pool VLAN200
   network 192.30.1.0 255.255.255.0
   domain-name YYYYY.local
   dns-server XXXXX.XXXX
   default-router 192.30.1.1
   lease 7
!
!
ip cef
!
multilink bundle-name authenticated
!
vpdn enable
!
vpdn-group L2TP
! Default L2TP VPDN group
accept-dialin
protocol l2tp
virtual-template 1
no l2tp tunnel authentication
!
!
!
!
!
username admin password 7 13040D01135D56796A
username man secret 5 XXXX
username supuer privilege 15 secret 5 XXXXX
archive
log config
hidekeys
!
!
crypto isakmp policy 1
encr 3des
authentication pre-share
group 2
crypto isakmp key YYYYZZZZ! address 0.0.0.0 0.0.0.0
!
!
crypto ipsec transform-set L2TP-Set2 esp-3des esp-sha-hmac
mode transport
!
crypto dynamic-map dyn-map 10
set nat demux
set transform-set L2TP-Set2
!
!
!
crypto map outside_map 65535 ipsec-isakmp dynamic dyn-map
!
!
!
!
!
!
interface Loopback1
description loopback for IPsec-pool
ip address 1.1.1.11 255.255.255.255
!
interface FastEthernet0/0
description MetroEthernet Link =-
ip address 58.9.110.23 255.255.255.248
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip virtual-reassembly
no ip mroute-cache
load-interval 30
speed auto
full-duplex
crypto map outside_map
!
interface FastEthernet0/1
description CISCO C2960
ip address 192.31.1.254 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip virtual-reassembly
load-interval 30
speed auto
full-duplex
arp timeout 1800
!
interface Virtual-Template1
ip unnumbered Loopback1
peer default ip address pool l2tp-pool
ppp encrypt mppe 128 required
ppp authentication ms-chap-v2 VPDN_AUTH
!
ip local pool l2tp-pool 1.1.1.1 1.1.1.10
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
ip http server
no ip http secure-server
!
!
ip nat inside source list 100 interface FastEthernet0/0 overload
!
no logging trap
access-list 100 permit udp any 1.1.1.0 0.0.0.255 eq isakmp
access-list 100 permit esp any host 1.1.1.0
access-list 100 permit ip 192.30.1.0 0.0.0.255 any
access-list 100 permit ip 192.168.200.0 0.0.0.255 any
access-list 100 permit ip 192.31.2.0 0.0.0.255 any
access-list 100 permit ip any any
access-list 100 permit ip 192.31.1.0 0.0.0.255 any
access-list 100 permit udp any 1.1.1.0 0.0.0.255 eq non500-isakmp
access-list 100 permit ip 1.1.1.0 0.0.0.255 any
!
!

pjain2 · ‎09-21-2015

please share the l2tp and the crypto debugs when you are trying to connect from the client:

debug l2tp all

debug crypto isakmp

deb crypto ipsec

chittisak411 · ‎09-23-2015

hi pjain2

thanks you so much, but i'm changed config from L2TP to IPSec but i' ve a problem when connected to VPN and get an IP address of VPN pool. but cannot access to internal network which are config NAT already. pls.help to check for me.

thakns you so much

Interface IP-Address OK? Method Status Protocol
Virtual-Template1 XXX.XXX.XXx YES TFTP up down

===================================================================

my config

hidekeys
!
!
crypto isakmp policy 10
encr 3des
authentication pre-share
group 2
lifetime 3600
crypto isakmp keepalive 90 12
!
crypto isakmp client configuration group Test_VPN
key XXXX#@123
dns 123.234.12.22
domain testvpn.vpn
pool test_POOL
acl 102
max-users 3
crypto isakmp profile vpn-ike-profile-1
   match identity group Test_VPN
   client authentication list vpn-authen_1
   isakmp authorization list vpn-group_1
   client configuration address respond
   virtual-template 1
!
!
crypto ipsec transform-set encrypt-method-1 esp-3des esp-sha-hmac
!
crypto ipsec profile VPN-Profile-1
set transform-set encrypt-method-1
!
!
!
!
!
!
!
interface FastEthernet0/0
description -= MetroEthernet
ip address XX.X.XX.zzz 255.255.255.0
ip access-group Inside_Access out
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip virtual-reassembly
no ip mroute-cache
load-interval 30
speed auto
full-duplex
no cdp enable
!
interface FastEthernet0/1
description -= SWITCH CISCO =-
ip address ZZZ.ZZZ.ZZZZ.ZZZ 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip inspect firewall in
ip virtual-reassembly
load-interval 30
speed auto
full-duplex
no cdp enable
arp timeout 1800
!
interface Virtual-Template1 type tunnel
ip unnumbered FastEthernet0/0
ip virtual-reassembly
tunnel mode ipsec ipv4
tunnel protection ipsec profile VPN-Profile-1
!
ip local pool test_POOL 192.168.100.200 192.168.100.210
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
ip http server
no ip http secure-server
!
!
ip nat inside source list 101 interface FastEthernet0/0 overload
ip nat inside source list 102 interface FastEthernet0/0 overload
!
ip access-list extended Inside_Access
permit ip XXXX.CCC.cCC.0 0.0.0.255 any
permit ip CCCC.CCCC.CCCC.0 0.0.0.255 any
permit ip CC.XXX.xxx.0 0.0.0.255 any
permit ip any any
permit ip XXXX.XXX.XXX.0 0.0.0.255 any
deny   ip any any
ip access-list extended NAT
deny   ip any any
!
no logging trap
access-list 101 remark [Deny NAT for VPN Clients]=-
access-list 101 deny   ip XXX.XXX.XX.0 0.0.0.255 192.168.100.0 0.0.0.255
access-list 101 deny   ip ZZ.Zz.ZZZ.0 0.0.0.255 192.168.100.0 0.0.0.255
access-list 101 remark -=[Internet NAT Service]=-
access-list 101 permit ip ZZZ.ZZ.ZZ.0 0.0.0.255 any
access-list 101 permit ip ZZ.ZZ.ZZ.0 0.0.0.255 any
access-list 101 permit ip ZZZ.ZZ.ZZ.0 0.0.0.255 any
access-list 101 permit ip ZZZ.ZZZ.X.0 0.0.0.255 any
access-list 102 remark ==[Cisco VPN Users]==
access-list 102 permit ip ZZ.ZZ.ZZ.0 0.0.0.255 192.168.100.0 0.0.0.255
access-list 102 permit ip ZZ.ZZZ.ZZ.0 0.0.0.255 192.168.100.0 0.0.0.255

pjain2 · ‎09-23-2015

have you added a route for 192.168.100.0/24 subnet in the internal lan to point the traffic back to the router

config L2TP on cisco router 1841 not working