Question

Cisco ASA 5505 SSL VPN trouble (after connect, no

Asked by: eriksmtka

I have a Cisco ASA 5505 running version 8.2(1)

I'm trying to set it up so to connect using the "Cisco AnyConnect SSL VPN Client"; I am currently using the predeployed Windows version 2.1.0148 of that.

I am able to run that and connect to the ASA remotely.  As I watch the logs as a user is connecting, I see no errors.  Everything appears to connect successfully, but once the connection process is finished, all traffic on the computer stops.  I am not able to ping external or internal IP addresses or otherwise communicate with them.

I'm about 95% sure the problem lies somewhere in the NAT-0 rules or ACLs.  I've searched through the forum for quite a while looking for similar cases.  I have found a few and have tried comparing my running-config with the ones that are posted and following the changes that are suggested, but I am never able to get a working running-config for myself.

Please take a look at my "show run" output and let me know what I'm missing.

Thank you!

: Saved
:
ASA Version 8.2(1)
!
hostname vpn
enable password xxxxx encrypted
passwd xxxxx encrypted
names
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 10.0.0.10 255.255.255.0
!
interface Vlan2
 nameif outside
 security-level 0
 ip address x.x.x.189 255.255.255.248
!
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
 switchport access vlan 2
!
boot system disk0:/asa821-k8.bin
ftp mode passive
clock timezone CST -6
clock summer-time CDT recurring
dns domain-lookup inside
dns server-group InteproDNS
 name-server 10.0.0.251
 domain-name intepro.us
access-list VPN-NAT extended permit ip 10.0.0.0 255.255.255.0 10.0.10.0 255.255.255.0
access-list VPN-splitNAT standard permit 10.0.0.0 255.255.255.0
no pager
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool inteproVPN-POOL 10.0.10.100-10.0.10.199 mask 255.255.255.0
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-621.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list VPN-NAT
nat (inside) 1 0.0.0.0 0.0.0.0
route outside 0.0.0.0 0.0.0.0 173.11.55.190 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 sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
dynamic-access-policy-record DfltAccessPolicy
 webvpn
  svc ask enable default svc
aaa-server ldap-auth protocol ldap
aaa-server ldap-auth (inside) host 10.0.0.251
 server-port 636
 ldap-base-dn DC=intepro,DC=us
 ldap-scope subtree
 ldap-naming-attribute sAMAccountName
 ldap-login-password *
 ldap-login-dn CN=Administrator,CN=Users,DC=intepro,DC=us
 ldap-over-ssl enable
 server-type microsoft
http server enable
http 0.0.0.0 0.0.0.0 outside
http 0.0.0.0 0.0.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
no crypto isakmp nat-traversal
telnet timeout 5
ssh 0.0.0.0 0.0.0.0 inside
ssh 0.0.0.0 0.0.0.0 outside
ssh timeout 60
console timeout 0
dhcpd auto_config outside
!
 
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
 enable outside
 svc image disk0:/anyconnect-win-2.1.0148-k9.pkg 1
 svc enable
 tunnel-group-list enable
group-policy inteproVPN internal
group-policy inteproVPN attributes
 dns-server value 10.0.0.251
 dhcp-network-scope none
 vpn-tunnel-protocol webvpn
 split-tunnel-policy tunnelspecified
 split-tunnel-network-list value VPN-splitNAT
 address-pools value inteproVPN-POOL
tunnel-group inteproVPN type remote-access
tunnel-group inteproVPN general-attributes
 address-pool inteproVPN-Pool
 authentication-server-group ldap-auth
 default-group-policy inteproVPN
tunnel-group inteproVPN webvpn-attributes
 group-alias vpn enable
 group-url https://x.x.x.189/vpn enable
!
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
prompt context
Cryptochecksum:xxxxx
: end

                                  
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Asked On
2009-09-29 at 12:01:37ID24771214
Tags

cisco asa 5505 ssl vpn

Topics

Networking Hardware Firewalls

,

Virtual Private Networking (VPN)

Participating Experts
1
Points
195
Comments
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Answers

 

by: mitrushiPosted on 2009-09-30 at 01:55:08ID: 25456630

I don't know if you have come accross this example.
http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080975e83.shtml

if it doesn't work we can troubleshoot further

 

by: eriksmtkaPosted on 2009-09-30 at 07:17:30ID: 25459084

@mitrushi:

thank you, i will check it out and post back.

 

by: eriksmtkaPosted on 2009-09-30 at 14:24:18ID: 25463815

I have modified the config to match that example as closely as possible.  The only differences are the obvious instance specific settings (like IP addresses and ranges) etc.  Other than that, I think everything else is the same.

The attached log file was started before I ran the SSL VPN "Cisco AnyConnect Client" and was stopped after I disconnected and closed the program.

The noteworthy entries in the logs are things like:
6|Sep 30 2009|16:13:16|106012|10.0.10.1||224.0.0.22||Deny IP from 10.0.10.1 to 224.0.0.22, IP options: "Router Alert"
6|Sep 30 2009|16:13:29|110002|10.0.10.1|51046|||Failed to locate egress interface for UDP from outside:10.0.10.1/51046 to 239.255.255.250/1900
3|Sep 30 2009|16:13:38|305005|10.0.0.254||||No translation group found for icmp src outside:10.0.10.1 dst inside:10.0.0.254 (type 8, code 0)

The operational differences between this config and the config in my original post is that, after the VPN completes it's connection process, I am able to access machines on the internet; just not machines on the internal network.  Can anybody see what might be missing?

 

by: mitrushiPosted on 2009-10-01 at 07:00:55ID: 25468691

I have gone through your config and I can see that you are missing a nat 0 or no nat entry, unfortunately the Cisco example doesn't deal with this. The idea is that traffic originating from 10.0.0.0/24 towards 10.0.10.0/24 and viceversa must not be translated. So you need a acl and a nat statement

access-list no_nat_vpn_traffic extended permit ip 10.0.0.0 255.255.255.0 10.0.10.0 255.255.255.0
nat (Inside) 0 access-list no_nat_vpn_traffic tcp 0 0 udp 0

Also you have a no crypto isakmp nat-traversal which can cause problems if one of the peers is behind a nat device.

Regarding your log entries the first one is some multicast traffic the firewall is blocking correctly, the second one has to do with Uinversal plug and play which most probably you do not want to allow through your firewall and the third is lack of nat translation from remote vpn which the nat 0 statement will take care of.

 

by: eriksmtkaPosted on 2009-10-01 at 08:51:27ID: 25470005

OK, I got this working.  The combination of the NAT rule and the example from the link from mitrushi is sufficient to make this work.  It didn't work for me initially, but I realized I had another problem going against me.  It was truly a face-palm moment:

What clued me in was as I was watching the logs on my ASA, I was seeing:

"Built inbound TCP connection 1467 for outside:10.0.10.1/2876 (10.0.10.1/2876) to inside:10.0.0.251/3389 (10.0.0.251/3389) (ssluser1)"

.. and then..

"Teardown TCP connection 1467 for outside:10.0.10.1/2876 to inside:10.0.0.251/3389 duration 0:00:30 bytes 0 SYN Timeout (ssluser1)"

.. but no message saying traffic was being denied or not being able to find a translation group like before.

My ASA is not in production right now, but it is a node on my internal network.  All the machines on my network are currently using a default gateway OTHER THAN the ASA.  When connection requests were sent, the TCP SYN packets were arriving at the destination host and a TCP ACK packet was sent back to the source.  (I discovered this by using Wireshark.)  However, because their default route was going to my prodcution NAT/Firewall, they were simply being dropped into the intergalactic bit-bucket.

Thank you, mitrushi, for posting that link.  Other examples I had followed didn't even get me close to this solution.

20120131-EE-VQP-002

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