VPN lan-to-lan cisco 5505

Posted on 2009-07-09
Last Modified: 2013-11-16
Good evening,

I created a vpn lan-to-lan. VPN only works when I launch a ping from inside the firewall to outside (the other net) . If I throw a ping from outside the firewall to inside, the VPN is not up.
Normally I have one active connection IKE and one IPSEC. When I throw a ping and active the vpn, another connection IPSEC is created.

The vpn only is up when y make a ping.

In the other firewall (draytek 2910), I always have one active connection, Synamic Cliente. When the vpn is active y haver other normal vpn connection.

: Saved


ASA Version 7.2(4) 


hostname ciscoasa

domain-name default.domain.invalid





interface Vlan1

 nameif inside

 security-level 100

 ip address 


interface Vlan2

 nameif outside

 security-level 0

 ip address 84.XXX.XXX.194 


interface Vlan3

 no forward interface Vlan1

 nameif dmz

 security-level 50

 ip address 


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 3


ftp mode passive

dns server-group DefaultDNS

 domain-name default.domain.invalid

same-security-traffic permit inter-interface

same-security-traffic permit intra-interface

access-list outside_access_in extended permit ip any any 

access-list outside_access_in extended permit tcp any interface outside eq 3389 

access-list INSIDE_ACL_OUT extended permit ip any any 

access-list 100 extended permit tcp any any eq 3389 

access-list inside_access_in extended permit ip any any 

access-list inbound extended permit tcp any interface outside eq 3389 

access-list RDP extended permit tcp any interface outside eq 3389 log 

access-list RDP extended permit tcp interface outside interface inside eq 3389 

access-list outside_1_cryptomap extended permit ip 

access-list inside_nat0_outbound extended permit ip 

pager lines 24

logging enable

logging asdm informational

mtu inside 1500

mtu outside 1500

mtu dmz 1500

ip local pool pool1 mask

icmp unreachable rate-limit 1 burst-size 1

asdm image disk0:/asdm-524.bin

no asdm history enable

arp timeout 14400

global (outside) 1 84.XXX.XXX.195-84.XXX.XXX.206 netmask

nat (inside) 0 access-list inside_nat0_outbound

nat (inside) 1

static (inside,outside) tcp 84.XXX.XXX.197 3389 3389 netmask 

static (inside,outside) tcp 84.XXX.XXX.198 3389 3389 netmask 

static (inside,outside) tcp 84.XXX.XXX.199 3389 3389 netmask 

access-group inside_access_in in interface inside

access-group 100 in interface outside

route outside 84.XXX.XXX.193 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

http server enable

http inside

http inside

http 84.XXX.XXX.194 outside

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-3DES-SHA esp-3des esp-sha-hmac 

crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac 

crypto ipsec transform-set ESP-3DES-NOAUT esp-3des esp-none 

crypto map outside_map 1 match address outside_1_cryptomap

crypto map outside_map 1 set pfs group1

crypto map outside_map 1 set connection-type originate-only

crypto map outside_map 1 set peer 89.XXX.XXX.96 

crypto map outside_map 1 set transform-set ESP-3DES-SHA

crypto map outside_map interface outside

crypto isakmp enable outside

crypto isakmp policy 10

 authentication pre-share

 encryption 3des

 hash sha

 group 2

 lifetime none

telnet timeout 5

ssh timeout 5

console timeout 0

dhcpd auto_config outside


dhcpd address inside

dhcpd dns interface inside

dhcpd enable inside


group-policy DefaultRAGroup internal

group-policy DefaultRAGroup attributes

 vpn-tunnel-protocol l2tp-ipsec 

tunnel-group DefaultL2LGroup ipsec-attributes

 isakmp keepalive threshold 30 retry 2

tunnel-group DefaultRAGroup general-attributes

 address-pool pool1

 default-group-policy DefaultRAGroup

tunnel-group DefaultRAGroup ipsec-attributes

 pre-shared-key *

 isakmp keepalive threshold 30 retry 2

tunnel-group 89.XXX.XXX.96 type ipsec-l2l

tunnel-group 89.XXX.XXX.96 ipsec-attributes

 pre-shared-key *

 peer-id-validate nocheck


 isakmp keepalive threshold 30 retry 2


class-map inspection_default

 match default-inspection-traffic



policy-map type inspect dns preset_dns_map


  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 hostname context 


: end

asdm image disk0:/asdm-524.bin

no asdm history enable

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Question by:rauljimenez
  • 3
LVL 15

Expert Comment

Comment Utility
from what you are describing, without sending a ping, the tunnel collapses --
you want to check ISAKMP keepalives, since tunnels can drop due to periods of inactivity. For the keepalives to work, both VPN endpoints must support them.

try this for starters

i.e for tunnel group
asa5505(config)#tunnel-group  ipsec-attributes
asa5505(config-tunnel-ipsec)#isakmp keepalive threshold 15 retry 10

also, make sure your ISAKMP lifetime matches on both tunnel enpoints---
86,400 is the default (24 hrs)

you might want to run a steady ping from hosts behind each peer network to keep data flowing, or a batchfile copying data continuously to a host behind each peer


Author Comment

Comment Utility

Thanks bignewf!!

The problem isn´t keepalives, the problem is that the vpn only starts when I send a ping or when I generate traffic between the two lan´s of the vpn. The vpn can´t star without a ping.

I have other firewall who´s can start and keepalives the vpn without send ping or something similar...

Author Comment

Comment Utility

someone knows how to always keep up a vpn ??

LVL 68

Accepted Solution

Qlemo earned 500 total points
Comment Utility
It's quite normal that some VPN devices build up tunnels only on demand. That behaviour is often intended. Other devices, more in the cheaper department, tend to use all VPN connections they are able to establish immediately after reboot.
I don't know whether you can change that behaviour on a general or by-tunnel base on Cisco. You could try if Dead Peer Detection helps - it often forces the tunnel to be established and stay active.

Author Closing Comment

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