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01.30.2008 at 03:23AM PST, ID: 23122387
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8.4

Cisco SSL VPN - NAT problems

Asked by grblades in Cisco PIX Firewall, Virtual Private Networking (VPN)

Tags: , , , ,

I have configured a SSL VPN on a new ASA5505 and followed the cisco configuration example at http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a008071c428.shtml
Of particular note is the fact that the IP range for the IP Pool is a valid IP address range on the internal network. This different to how IPSEC VPNs are configured. Also the example has no 'nat 0' rule which I assume is because the ip range is internal.

The problem I am having is that I am getting errors like the following when the SSL VPN is established which points to a NAT issue but following the Cisco example this should never happen.
  No translation group found for udp src outside:10.0.110.100/1467 dst inside:10.0.1.9/53

Do I have a mistake in my configuration causing this?
Or is the cisco example wrong/incomplete and I should have a nat 0 rule?
If so should I be using an internal IP address pool or should it be external like IPSEC client VPNs?


The nat 0 acl I have in the config is just a leftover from when I had a ipsec vpn configured.Start Free Trial 
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ASA Version 7.2(3)
!
hostname asa5505
domain-name linguaphone-intranet.co.uk
enable password XXXXXXXXXXXXXXXX encrypted
names
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 10.0.0.3 255.255.0.0
!
interface Vlan2
 nameif outside
 security-level 0
 ip address xxx.xxx.60.164 255.255.255.248
!
interface Ethernet0/0
 switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
passwd XXXXXXXXXXXXXXXX encrypted
ftp mode passive
dns server-group DefaultDNS
 domain-name linguaphone-intranet.co.uk
access-list vpnstaff_splitTunnelAcl standard permit 10.0.0.0 255.255.0.0
access-list inside_nat0_outbound extended permit ip 10.0.0.0 255.255.0.0 192.168.110.0 255.255.255.128
access-list inside_access_in extended permit tcp any interface inside eq ssh
access-list inside_access_in extended permit ip host 10.0.1.9 any
access-list inside_access_in extended permit ip host 10.0.251.1 any
access-list inside_access_in extended deny ip any any
access-list staffACL extended permit ip any any
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool staffssl 10.0.110.100-10.0.110.200 mask 255.255.0.0
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-523.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 0.0.0.0 0.0.0.0
access-group inside_access_in in interface inside
route outside 0.0.0.0 0.0.0.0 xxx.xxx.60.161 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout uauth 0:05:00 absolute
aaa authentication ssh console LOCAL
http server enable
http 10.0.0.0 255.255.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto dynamic-map outside_dyn_map 20 set pfs
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-AES-256-SHA
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 10
 authentication pre-share
 encryption aes-256
 hash sha
 group 2
 lifetime 86400
crypto isakmp nat-traversal  20
crypto isakmp ipsec-over-tcp port 10000
no vpn-addr-assign aaa
no vpn-addr-assign dhcp
telnet timeout 5
ssh 10.0.0.0 255.255.0.0 inside
ssh timeout 5
console timeout 0
dhcpd auto_config outside
!
 
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect rsh
  inspect rtsp
  inspect esmtp
  inspect sqlnet
  inspect skinny
  inspect sunrpc
  inspect xdmcp
  inspect sip
  inspect netbios
  inspect tftp
!
service-policy global_policy global
ntp authenticate
ntp server 10.0.1.9 source inside prefer
tftp-server inside 10.0.1.9 asa5505-confg
webvpn
 enable outside
 svc image disk0:/sslclient-win-1.1.0.154.pkg 1
 svc enable
 tunnel-group-list enable
group-policy SSLstaff internal
group-policy SSLstaff attributes
 wins-server value 10.0.1.5
 dns-server value 10.0.1.9
 vpn-idle-timeout 15
 vpn-tunnel-protocol IPSec l2tp-ipsec webvpn
 split-tunnel-policy tunnelspecified
 split-tunnel-network-list value vpnstaff_splitTunnelAcl
 webvpn
  svc enable
  svc keep-installer installed
  svc rekey time 30
  svc rekey method ssl
username tdurell password XXXXXXXXXXXXXXX encrypted
username tdurell attributes
 vpn-group-policy SSLstaff
username gblades password XXXXXXXXXXXXX encrypted privilege 15
username gblades attributes
 vpn-group-policy SSLstaff
tunnel-group SSLstaff type webvpn
tunnel-group SSLstaff general-attributes
 address-pool staffssl
 default-group-policy SSLstaff
tunnel-group SSLstaff webvpn-attributes
 hic-fail-group-policy SSLstaff
 nbns-server 10.0.1.5 timeout 2 retry 2
 group-alias Staff enable
prompt hostname context
Cryptochecksum:97af2a146c4fd74612fcc8e1019047eb
: end
[+][-]01.30.2008 at 05:38PM PST, ID: 20783240

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About this solution

Zones: Cisco PIX Firewall, Virtual Private Networking (VPN)
Tags: cisco, found, group, ssl, vpn
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Solution Provided By: batry_boy
Participating Experts: 2
Solution Grade: B
 
 
[+][-]01.31.2008 at 01:11AM PST, ID: 20785014

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[+][-]01.31.2008 at 03:37PM PST, ID: 20792615

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[+][-]02.01.2008 at 01:12AM PST, ID: 20795157

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[+][-]02.06.2008 at 04:08AM PST, ID: 20831260

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