Only One VPN session allowed on ASA 5510

ed.crawford · ‎12-02-2010

I have a broadband router with the internal interface of the broadband router plugged into the external interface of an ASA 5510. The NAT and PAT translations have to be done on the broadband router, and I am sending all inbound traffic to the ASA. Everything works great with exception of multiple VPN sessions.

I can establish one remote VPN session, however it appears that I can not establish another session at the same time. I suspect that it has something to do with the fact that NAT has to take place on the broadband router. The broadband is PPOA so I can't go directly to the ASA. How can I fix this?

Another issue is if I am connected to the VPN and then disconnect, I can not reconnect unless I wait a while; almost like something has to time out. Any ideas?

Thanks for your help.

Federico Coto Fajardo · ‎12-02-2010

Hi,

Are you establishing VPN connections to the ASA? (router redirecting VPN traffic to the ASA)..

Since the ASA is behind NAT, you might need ''cry isa nat-t''

Federico.

ed.crawford · ‎12-02-2010

The broadband router is a Zyxel 660-H. I am forwarding all ports to the ASA

Federico Coto Fajardo · ‎12-02-2010

Problem could be that the router is not redirecting the VPN traffic correctly.

Can you try enabling IPsec/TCP on the ASA and client and attempt to connect more than one client at the same time?

Federico.

ed.crawford · ‎12-07-2010

Where is that set on the ASA? If I set the client to IPSEC over TCP I get nothing.

Jitendriya Athavale · ‎12-07-2010

try taking the client back to ipsec over udp and try the nat traversal comamnd on asa as suggested previously

issue the command

crypto isakmp nat-traversal

on the asa

ed.crawford · ‎12-07-2010

I did that and it still does not work. Here is what I get from the ASA logs:

4

Dec 07 2010

16:18:36

713903

Group = VPN_UNRESTRICTED, IP = 195.112.60.245, Error: Unable to remove PeerTblEntry

3

Dec 07 2010

16:18:36

713902

Group = VPN_UNRESTRICTED, IP = 195.112.60.245, Removing peer from peer table failed, no match!

6

Dec 07 2010

16:18:06

302021

195.112.60.245

0

192.168.134.1

0

Teardown ICMP connection for faddr 195.112.60.245/0 gaddr 192.168.134.1/0 laddr 192.168.134.1/0

6

Dec 07 2010

16:18:06

302020

195.112.60.245

0

192.168.134.1

0

Built inbound ICMP connection for faddr 195.112.60.245/0 gaddr 192.168.134.1/0 laddr 192.168.134.1/0

6

Dec 07 2010

16:17:36

302021

195.112.60.245

0

192.168.134.1

0

Teardown ICMP connection for faddr 195.112.60.245/0 gaddr 192.168.134.1/0 laddr 192.168.134.1/0

6

Dec 07 2010

16:17:36

302020

195.112.60.245

0

192.168.134.1

0

Built inbound ICMP connection for faddr 195.112.60.245/0 gaddr 192.168.134.1/0 laddr 192.168.134.1/0

6

Dec 07 2010

16:17:06

302021

195.112.60.245

0

192.168.134.1

0

Teardown ICMP connection for faddr 195.112.60.245/0 gaddr 192.168.134.1/0 laddr 192.168.134.1/0

6

Dec 07 2010

16:17:06

302020

195.112.60.245

0

192.168.134.1

0

Built inbound ICMP connection for faddr 195.112.60.245/0 gaddr 192.168.134.1/0 laddr 192.168.134.1/0

Robert Salazar · ‎12-07-2010

Are you using the same credentials for your second/simultaneous connection attempt?

What error message do you see on the client when the attempt fails?

ed.crawford · ‎12-07-2010

No, different credentials

ed.crawford · ‎12-07-2010

The strange thing is I don't see the nat-t in the running config. I issue crypto isakmp nat-tra 21 with no errors, but is I do

sh run all | inc nat

it doesn't show it.

comms-asa-01(config)# crypto isakmp nat-traversal 21
comms-asa-01(config)# end
comms-asa-01# sh run all | inc nat
nat (inside) 0 access-list inside_nat0_outbound

Jitendriya Athavale · ‎12-08-2010

When you connect the vpn

Can you issue the command

Show crypto ipsec sa peer

And can you paste that

Regards,

Jitendriya

ed.crawford · ‎12-08-2010

I don't think it every sets up an sa. The client just says contacting security gateway. Here was the result:

comms-asa-01# Show crypto ipsec sa peer 195.112.60.245

There are no ipsec sas for peer 195.112.60.245
comms-asa-01# Show crypto ipsec sa peer 195.112.60.245

There are no ipsec sas for peer 195.112.60.245

Here are the client logs

82 10:09:10.699 12/08/10 Sev=Info/4 CM/0x63100002
Begin connection process

83 10:09:10.704 12/08/10 Sev=Info/4 CM/0x63100004
Establish secure connection

84 10:09:10.705 12/08/10 Sev=Info/4 CM/0x63100024
Attempt connection with server "mail.commsfm.com"

85 10:09:10.711 12/08/10 Sev=Info/6 IKE/0x6300003B
Attempting to establish a connection with 81.136.150.101.

86 10:09:10.725 12/08/10 Sev=Info/4 IKE/0x63000013
SENDING >>> ISAKMP OAK AG (SA, KE, NON, ID, VID(Xauth), VID(dpd), VID(Frag), VID(Nat-T), VID(Unity)) to 81.136.150.101

87 10:09:10.838 12/08/10 Sev=Info/5 IKE/0x6300002F
Received ISAKMP packet: peer = 81.136.150.101

88 10:09:10.839 12/08/10 Sev=Info/4 IKE/0x63000014
RECEIVING <<< ISAKMP OAK AG (SA, KE, NON, ID, HASH, VID(Unity), VID(Xauth), VID(dpd), VID(Nat-T), NAT-D, NAT-D, VID(Frag), VID(?)) from 81.136.150.101

89 10:09:10.839 12/08/10 Sev=Info/5 IKE/0x63000001
Peer is a Cisco-Unity compliant peer

90 10:09:10.839 12/08/10 Sev=Info/5 IKE/0x63000001
Peer supports XAUTH

91 10:09:10.839 12/08/10 Sev=Info/5 IKE/0x63000001
Peer supports DPD

92 10:09:10.839 12/08/10 Sev=Info/5 IKE/0x63000001
Peer supports NAT-T

93 10:09:10.840 12/08/10 Sev=Info/5 IKE/0x63000001
Peer supports IKE fragmentation payloads

94 10:09:10.848 12/08/10 Sev=Info/6 IKE/0x63000001
IOS Vendor ID Contruction successful

95 10:09:10.849 12/08/10 Sev=Info/4 IKE/0x63000013
SENDING >>> ISAKMP OAK AG *(HASH, NOTIFY:STATUS_INITIAL_CONTACT, NAT-D, NAT-D, VID(?), VID(Unity)) to 81.136.150.101

96 10:09:10.849 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

97 10:09:10.849 12/08/10 Sev=Info/4 IKE/0x63000083
IKE Port in use - Local Port = 0xDDEC, Remote Port = 0x1194

98     10:09:10.850 12/08/10 Sev=Info/5 IKE/0x63000072
Automatic NAT Detection Status:
   Remote end IS behind a NAT device
   This   end IS behind a NAT device

99 10:09:10.850 12/08/10 Sev=Info/4 CM/0x6310000E
Established Phase 1 SA. 1 Crypto Active IKE SA, 0 User Authenticated IKE SA in the system

100 10:09:11.200 12/08/10 Sev=Info/4 IPSEC/0x63700008
IPSec driver successfully started

101 10:09:11.200 12/08/10 Sev=Info/4 IPSEC/0x63700014
Deleted all keys

102 10:09:21.347 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

103 10:09:31.485 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

104 10:09:41.622 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

105 10:09:51.778 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

106 10:10:01.918 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

107 10:10:12.058 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

108 10:10:22.205 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

109 10:10:32.340 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

110 10:10:42.486 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

111 10:10:52.636 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

112 10:11:02.776 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

113 10:11:12.916 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

114 10:11:23.062 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

115 10:11:33.198 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

116 10:11:43.343 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

117 10:11:53.495 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

118 10:12:03.634 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

119 10:12:13.775 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

120 10:12:23.917 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

121 10:12:34.062 12/08/10 Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA