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7.5

L2TP fails after a few days but only for one remote branch office

Asked by neilpage99 in Networking Hardware Firewalls, Virtual Private Networking (VPN), IPSec Security Protocol

Tags: Cisco, ASA, 5505, workgroup firewall appliance

I spent all last week digging through articles here, Google, Cisco, etc. I found a lot of information - but none that really addresses my problem.

My Cisco ASA 5505 'terminates' - i.e. acts as the L2TP server (via RADIUS to an internal domain controller) for multiple remote acces clients throughout the state. They all use Windows operating systems (usually XP Pro or Vista) and the native Windows L2TP capability.

Everything was running fine for at least two weeks then the problem started. After an average of 2 days, all remote L2TP clients AT ONE SPECIFIC BRANCH OFFICE fail to connect. They receive the classic error "remote computer is not responding". During this time, I can see via ASA logs that the connection attempts reach the ASA and seem to complete hand shake as far as the ASA can tell. But the end result is a failed connection. Also, during this time, ANYONE else outside of that branch office - but just as remote - CAN in fact connect via L2TP.

A reload of the ASA gets everything working again for another couple of days then the problem starts again.

The two things that really bug me about it are (1) a reload of the ASA temporarily corrects the problem; and (2) it only affects one branch office. I have no administrative control over the branch office, and as such cannot manipulate their NetScreen firewall. They are a business-class DSL subscriber, and all outgoing connections to the internet fill appear to be sourced from the same IP - not a proxy like some. Below is the 'scrubbed' config. Many thanks to anyone with advice.
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sh run
: Saved
:
ASA Version 8.0(3)
!
hostname myhost
domain-name myhost.local
enable password blablabla encrypted
names
<a bunch of names>
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 192.168.1.1 255.255.255.0
!
interface Vlan2
 nameif outside
 security-level 0
 ip address 1.1.1.1 255.255.255.248
!
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 2KFQnbNIdI.2KYOU encrypted
boot system disk0:/asa803-k8.bin
ftp mode passive
dns server-group DefaultDNS
 domain-name myhost.local
same-security-traffic permit intra-interface
object-group network www-servers
 network-object host web035-out
 network-object host web036-out
 network-object host testserver-out
object-group icmp-type icmp-traffic
 icmp-object source-quench
 icmp-object unreachable
 icmp-object time-exceeded
 icmp-object echo-reply
 icmp-object echo
access-list out-to-in extended permit icmp any any object-group icmp-traffic
access-list out-to-in extended permit tcp any object-group www-servers eq 3389
access-list out-to-in extended permit tcp any object-group www-servers eq www
access-list out-to-in extended permit tcp any object-group www-servers eq https
access-list inside-networks extended permit ip 192.168.1.0 255.255.255.0 any
access-list DefaultRAGroup_splitTunnelAcl standard permit any
access-list inside_nat0_outbound extended permit ip any 192.168.2.0 255.255.255.0
pager lines 24
logging enable
logging buffer-size 10000
logging asdm debugging
mtu inside 1500
mtu outside 1500
ip local pool vpnpool 192.168.2.50-192.168.2.200 mask 255.255.255.0
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-603.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 access-list inside-networks
nat (inside) 1 0.0.0.0 0.0.0.0
nat (outside) 1 192.168.2.0 255.255.255.0
static (inside,outside) web035-out web035-in netmask 255.255.255.255
static (inside,outside) web036-out web036-in netmask 255.255.255.255
static (inside,outside) testserver-out testserver-in netmask 255.255.255.255
access-group out-to-in in interface outside
route outside 0.0.0.0 0.0.0.0 1.1.1.2 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
dynamic-access-policy-record DfltAccessPolicy
aaa-server IAS protocol radius
aaa-server IAS host web035-in
 key jupiter
aaa authentication enable console LOCAL
aaa authentication ssh console LOCAL
aaa authentication telnet console LOCAL
aaa authentication http console LOCAL
http testserver-in 255.255.255.255 inside
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set TRANS_ESP_3DES_SHA esp-3des esp-sha-hmac
crypto ipsec transform-set TRANS_ESP_3DES_SHA mode transport
crypto ipsec transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5 TRANS_ESP_3DES_SHA
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 10
 authentication pre-share
 encryption 3des
 hash sha
 group 2
 lifetime 86400
crypto isakmp nat-traversal 30
telnet timeout 5
ssh 0.0.0.0 0.0.0.0 inside
ssh 1.1.1.1 255.255.0.0 outside
ssh timeout 30
ssh version 2
console timeout 0
 
threat-detection basic-threat
threat-detection statistics access-list
group-policy DefaultRAGroup internal
group-policy DefaultRAGroup attributes
 vpn-tunnel-protocol IPSec l2tp-ipsec
 split-tunnel-policy tunnelspecified
 split-tunnel-network-list value DefaultRAGroup_splitTunnelAcl
 default-domain value nrhosting.local
username user1 password blabla1 encrypted privilege 15
username user2 password blabla1 encrypted privilege 15
username user3 password blabla1 encrypted privilege 15
tunnel-group DefaultRAGroup general-attributes
 address-pool vpnpool
 authentication-server-group IAS
 default-group-policy DefaultRAGroup
tunnel-group DefaultRAGroup ipsec-attributes
 pre-shared-key *
tunnel-group DefaultRAGroup ppp-attributes
 no authentication chap
 no authentication ms-chap-v1
 authentication ms-chap-v2
!
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 skinny
  inspect sunrpc
  inspect xdmcp
  inspect sip
  inspect netbios
  inspect tftp
  inspect sqlnet
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:<checksum>
: end
[+][-]10/18/08 10:25 PM, ID: 22751109Accepted Solution

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About this solution

Zones: Networking Hardware Firewalls, Virtual Private Networking (VPN), IPSec Security Protocol
Tags: Cisco, ASA, 5505, workgroup firewall appliance
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Solution Provided By: leonjs
Participating Experts: 2
Solution Grade: B
 
[+][-]10/14/08 11:43 PM, ID: 22718489Expert Comment

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[+][-]10/15/08 09:17 AM, ID: 22722832Author Comment

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[+][-]10/18/08 03:23 PM, ID: 22750036Expert Comment

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[+][-]10/18/08 05:41 PM, ID: 22750397Author Comment

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[+][-]10/18/08 10:23 PM, ID: 22751103Expert Comment

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[+][-]10/18/08 10:25 PM, ID: 22751106Expert Comment

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