VPN connectivity lost after the regeneration of the keys (I think)

Hello

I have a L2L IPSEC tunnel between a set of failover pair of two ASA5510 and a unique ASA5505. Over time, they will lose connectivity through the tunnel. The tunnel itself remains standing, but can not pass any traffic.

When you look at the tunnel I still see what is on the Board of 5510's (shown in bold @ IPSEC ID 3):

advdns # sh vpn-sessiondb detail l2l filter ipaddress 93.160.2xx.1xx

Session type: LAN-to-LAN detailed

Link: 93.160.2xx.1xx
Index: 14 IP Addr: K015-Peer
Protocol: IPSecLAN2LAN encryption: 3DES
Hash: SHA1
TX Bytes: bytes 430820527 Rx: 9869311
Connect time: 01:16:13 CEDT Monday, March 28, 2011
Duration: 7 h: 46 m: 47 s
Filter name: K015-L2L-filter

IKE Sessions: 1
IPSec sessions: 2

IKE:
Session ID: 1
The UDP Src Port: 500 UDP Dst Port: 500
IKE Neg Mode: Hand Auth Mode: preSharedKeys
Encryption: 3DES hash: SHA1
Generate a new key Int (T): 86400 seconds given to the key Left (T): 58390 seconds
Group D/H: 2

IPSec:
Session ID: 2
Local addr: HOST_RDC001/255.255.255.255/0/0
Remote addr: 192.168.15.0/255.255.255.0/0/0
Encryption: 3DES hash: SHA1
Encapsulation: Tunnel
Generate a new key Int (T): 28800 seconds given to the key Left (T): 25270 seconds
Generate a new key Int (D): 413696 K-bytes given to the key Left (D): 413688 K-bytes
TX Bytes: 24387 bytes Rx: 12754
TX pkts: Rx 195 Pkts: 195

IPSec:
Session ID: 3
Local addr: 10.30.15.0/255.255.255.0/0/0
Remote addr: 192.168.15.0/255.255.255.0/0/0
Encryption: 3DES hash: SHA1
Encapsulation: Tunnel
Generate a new key Int (T): 28800 seconds given to the key Left (T): 25715 seconds
Generate a new key Int (D): 413696 K - bytes given to the key Left (D): 1 K-bytes
TX Bytes: bytes 430796140 Rx: 9856557
TX pkts: 385454 Pkts Rx: 207904

This is the result of the order even at the end of the tunnel ASA5505:

PFF # sh vpn-sessiondb detail l2l

Session type: LAN-to-LAN detailed

Link: 83.136.xx.xxx
Index: 1 IP address: 83.136.xx.xxx
Protocol: IPSecLAN2LAN encryption: 3DES
Hash: SHA1
TX Bytes: bytes 9869359 Rx: 430815282
Connect time: 14:00:28 UTC Sunday, March 27, 2011
Duration: 7 h: 47 m: 00s
Name of the filter:

IKE Sessions: 1
IPSec sessions: 2

IKE:
Session ID: 1
The UDP Src Port: 500 UDP Dst Port: 500
IKE Neg Mode: Hand Auth Mode: preSharedKeys
Encryption: 3DES hash: SHA1
Generate a new key Int (T): 86400 seconds given to the key Left (T): 58381 seconds
Group D/H: 2

IPSec:
Session ID: 2
Local addr: 192.168.15.0/255.255.255.0/0/0
Remote addr: 10.1.11.1/255.255.255.255/0/0
Encryption: 3DES hash: SHA1
Encapsulation: Tunnel
Generate a new key Int (T): 28800 seconds given to the key Left (T): 25256 seconds
Generate a new key Int (D): 4275000 K-bytes given to the key Left (D): 4274992 K-bytes
Idle Time Out: 30 Minutes idling left: 29 Minutes
TX Bytes: 12754 bytes Rx: 24387
TX pkts: Rx 195 Pkts: 195

IPSec:
Session ID: 3
Local addr: 192.168.15.0/255.255.255.0/0/0
Remote addr: 10.30.15.0/255.255.255.0/0/0
Encryption: 3DES hash: SHA1
Encapsulation: Tunnel
Generate a new key Int (T): 28800 seconds given to the key Left (T): 25701 seconds
Generate a new key Int (D): 4275000 K-bytes given to the key Left (D): 3861311 K-bytes
Idle Time Out: 30 Minutes idling left: 30 Minutes
TX Bytes: bytes 9856605 Rx: 430790895
TX pkts: 207905 Pkts Rx: 385265

On the ASA5505 I can see the following in the log:

March 27, 2011 21:21:17: % ASA-4-402120: IPSEC: received a package ESP (SPI = 0xBB2A21CF, sequence number = 0x1BB08) 83.136.xx.xxx (user = 83.136.xx.xxx) at 93.160.2xx.1xx, which has no authentication.
March 27, 2011 21:26:12: % ASA-4-402120: IPSEC: received a package ESP (SPI = 0xBB2A21CF, sequence number = 0x2EF6E) 83.136.xx.xxx (user = 83.136.xx.xxx) at 93.160.2xx.1xx, which has no authentication.

It has done this 4 - 5 times now, so I don't think it's a temporary problem. The ASA5505 has been restarted several times... 5510 failover restart is not an option. The 5510 holds currently more than 50 IPSEC tunnels, and it is the only features like this.

If I make one counterpart of his clear cry ips 'The 5505 IP', then the tunnel's functional again.

The SW version is:

5510: 7.2. (4) 9

5505: 7.2. (4)

This is the setup I use for the tunnel:

5510:

Crypto ipsec transform-set esp-SHA-ESP-3DES-3des esp-sha-hmac

address for correspondence card crypto outside_map 15 K015-L2L-list
outside_map 15 peer Peer-K015 crypto card game
card crypto outside_map 15 game of transformation-ESP-3DES-SHA
life safety association set card crypto outside_map 15 28800 seconds
card crypto outside_map 15 set security-association life kilobytes 4608000
outside_map interface card crypto outside
crypto isakmp identity address
crypto ISAKMP allow outside
crypto ISAKMP policy 10
preshared authentication
3des encryption
sha hash
Group 2
life 86400

5505:

Crypto ipsec transform-set esp-SHA-ESP-3DES-3des esp-sha-hmac
card crypto VPNMAP 10 corresponds to the address Hosting_List
card crypto VPNMAP 10 set peer 83.136.xx.xxx
10 VPNMAP transform-set ESP-3DES-SHA crypto card game
VPNMAP interface card crypto outside
crypto ISAKMP allow outside
crypto ISAKMP policy 10
preshared authentication
3des encryption
sha hash
Group 2
life 86400

Anyone of you you have any good ideas?

Best regards

Jesper Ross

I just checked and there are a number of bugs to generate a new key, ASA version 7.2.4 Please kindly pass the two ASA at least version 7.2.5.

Here are the bugs for your reference:

CSCtc47782 Invalid IKE traffic causes to generate a new key to fail:

http://Tools.Cisco.com/support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtc47782

CSCso87442  ASA displays smaller traffic-volume lifetime than negotiated:
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCso87442

CSCsq67954 ASA rekeys at less traffic volume than expected value:
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsq67954

Prior to upgrade, you can just remove the following and see if it makes any difference:
crypto map VPNMAP 10 set security-association lifetime kilobytes 4608000
crypto map outside_map 15 set security-association lifetime kilobytes 4608000

Clear tunnels on both end, and monitor to see if you are seeing the same issue.

Tags: Cisco Security

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    Frame 4 (42 bytes on wire, 42 captured bytes)

    Ethernet II, Src: 172.21.35.5 (00:11:25:a8:75:7e), Dst: Broadcast (ff: ff: ff: ff: ff: ff)

    Address Resolution Protocol (request)

    N ° time Source Destination Protocol Info

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    Frame 5 (106 bytes on wire, 106 captured bytes)

    Ethernet II, Src: 172.21.35.4 (00:11:25:57:f9:2 c), Dst: 172.21.35.5 (00:11:25:a8:75:7e)

    Address Resolution Protocol (reply)

    N ° time Source Destination Protocol Info

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    Image 6 (60 bytes on wire, 60 bytes captured)

    Ethernet II, Src: 172.21.35.1 (00: 0d: 88:ef:23:29), Dst: 172.21.35.5 (00:11:25:a8:75:7e)

    Address Resolution Protocol (reply)

    on the pix

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    795: arp-in: generate the response of 172.21.35.4 000d.88ef.2329 to 172.21.35.5 0011.25a8.757e

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    Hello

    Maybe it's because proxy ARP on the pix. You can try disabling this interface with the command "sysopt noproxyarp.

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