11-01-2012 09:19 PM - edited 02-21-2020 06:27 PM
Greetings,
We have an issue with a previously working VPN that is now not working. To our knowledge, nothing was changed but I'm not sure what could explain this VPN suddenly stopping.
Output of sho crypto isakmp sa:
Active SA: 1
Rekey SA: 0 (A tunnel will report 1 Active and 1 Rekey SA during rekey)
Total IKE SA: 1
1 IKE Peer: xx.xx.xx.98
Type : L2L Role : responder
Rekey : no State : MM_ACTIVE
Output of sho crypto ipsec sa. As you can see, packets are decrypted but not encrypted.
interface: outside
Crypto map tag: outside_map, seq num: 1, local addr: xx.xx.xx.150
access-list outside_1_cryptomap extended permit ip 10.10.10.0 255.255.255.0 10.20.27.0 255.255.255.0
local ident (addr/mask/prot/port): (10.10.10.0/255.255.255.0/0/0)
remote ident (addr/mask/prot/port): (CompanyLAN/255.255.255.0/0/0)
current_peer: xx.xx.xx.98
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0
#pkts decaps: 2840, #pkts decrypt: 2840, #pkts verify: 2840
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0
#pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0
#PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0
#send errors: 0, #recv errors: 0
local crypto endpt.: xx.xx.xx.150, remote crypto endpt.: xx.xx.xx.98
path mtu 1500, ipsec overhead 58, media mtu 1500
current outbound spi: 1C7D07C2
current inbound spi : DD907A48
inbound esp sas:
spi: 0xDD907A48 (3717233224)
transform: esp-3des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, PFS Group 2, }
slot: 0, conn_id: 811008, crypto-map: outside_map
sa timing: remaining key lifetime (sec): 24872
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0xFFFFFFFF 0xFFFFFFFF
outbound esp sas:
spi: 0x1C7D07C2 (477956034)
transform: esp-3des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, PFS Group 2, }
slot: 0, conn_id: 811008, crypto-map: outside_map
sa timing: remaining key lifetime (sec): 24872
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001
Crypto map tag: outside_map, seq num: 1, local addr: xx.xx.xx.150
access-list outside_1_cryptomap extended permit ip 10.10.12.0 255.255.255.0 10.20.27.0 255.255.255.0
local ident (addr/mask/prot/port): (10.10.12.0/255.255.255.0/0/0)
remote ident (addr/mask/prot/port): (CompanyLAN/255.255.255.0/0/0)
current_peer: xx.xx.xx.98
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0
#pkts decaps: 3685, #pkts decrypt: 3685, #pkts verify: 3685
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0
#pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0
#PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0
#send errors: 0, #recv errors: 0
local crypto endpt.:xx.xx.xx.150, remote crypto endpt.: xx.xx.xx.98
path mtu 1500, ipsec overhead 58, media mtu 1500
current outbound spi: 1C7D07C1
current inbound spi : 16B92403
inbound esp sas:
spi: 0x16B92403 (381232131)
transform: esp-3des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, PFS Group 2, }
slot: 0, conn_id: 811008, crypto-map: outside_map
sa timing: remaining key lifetime (sec): 24871
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0xFFFFFFFF 0xFFFFFFFF
outbound esp sas:
spi: 0x1C7D07C1 (477956033)
transform: esp-3des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, PFS Group 2, }
slot: 0, conn_id: 811008, crypto-map: outside_map
sa timing: remaining key lifetime (sec): 24870
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001
Crypto map tag: outside_map, seq num: 1, local addr: xx.xx.xx.150
access-list outside_1_cryptomap extended permit ip 10.10.14.0 255.255.255.0 10.20.27.0 255.255.255.0
local ident (addr/mask/prot/port): (10.10.14.0/255.255.255.0/0/0)
remote ident (addr/mask/prot/port): (CompanyLAN/255.255.255.0/0/0)
current_peer: xx.xx.xx.98
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0
#pkts decaps: 1035, #pkts decrypt: 1035, #pkts verify: 1035
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0
#pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0
#PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0
#send errors: 0, #recv errors: 0
local crypto endpt.: xx.xx.xx.150, remote crypto endpt.: xx.xx.xx.98
path mtu 1500, ipsec overhead 58, media mtu 1500
current outbound spi: 1C7D07C3
current inbound spi : 64B9A673
inbound esp sas:
spi: 0x64B9A673 (1689888371)
transform: esp-3des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, PFS Group 2, }
slot: 0, conn_id: 811008, crypto-map: outside_map
sa timing: remaining key lifetime (sec): 24878
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0xFFFFFFFF 0xFFFFFFFF
outbound esp sas:
spi: 0x1C7D07C3 (477956035)
transform: esp-3des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, PFS Group 2, }
slot: 0, conn_id: 811008, crypto-map: outside_map
sa timing: remaining key lifetime (sec): 24878
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001
Crypto map tag: outside_map, seq num: 1, local addr: xx.xx.xx.150
access-list outside_1_cryptomap extended permit ip 10.10.16.0 255.255.255.0 10.20.27.0 255.255.255.0
local ident (addr/mask/prot/port): (10.10.16.0/255.255.255.0/0/0)
remote ident (addr/mask/prot/port): (CompanyLAN/255.255.255.0/0/0)
current_peer: xx.xx.xx.98
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0
#pkts decaps: 1566, #pkts decrypt: 1566, #pkts verify: 1566
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0
#pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0
#PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0
#send errors: 0, #recv errors: 0
local crypto endpt.: xx.xx.xx.150, remote crypto endpt.: xx.xx.xx.98
path mtu 1500, ipsec overhead 58, media mtu 1500
current outbound spi: 1C7D07C4
current inbound spi : A6446E56
inbound esp sas:
spi: 0xA6446E56 (2789502550)
transform: esp-3des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, PFS Group 2, }
slot: 0, conn_id: 811008, crypto-map: outside_map
sa timing: remaining key lifetime (sec): 24893
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0xFFFFFFFF 0xFFFFFFFF
outbound esp sas:
spi: 0x1C7D07C4 (477956036)
transform: esp-3des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, PFS Group 2, }
slot: 0, conn_id: 811008, crypto-map: outside_map
sa timing: remaining key lifetime (sec): 24893
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001
Config from the ASA
: Saved
: Written by enable_15 at 19:38:10.199 PDT Thu Nov 1 2012
!
ASA Version 8.0(5)
!
hostname ciscoasa
domain-name default.domain.invalid
enable password *** encrypted
passwd *** encrypted
names
name 10.20.27.0 CompanyLAN
dns-guard
!
interface Ethernet0/0
nameif outside
security-level 0
ip address xx.xx.xx.150 255.255.255.252
!
interface Ethernet0/1
nameif inside
security-level 100
ip address 10.10.10.3 255.255.255.0
!
interface Ethernet0/2
shutdown
no nameif
no security-level
no ip address
!
interface Ethernet0/3
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
shutdown
nameif management
security-level 100
ip address 192.168.1.1 255.255.255.0
management-only
!
ftp mode passive
clock timezone PST -8
clock summer-time PDT recurring
dns server-group DefaultDNS
domain-name default.domain.invalid
object-group service VPN
service-object gre
service-object esp
service-object ah
service-object udp eq 4500
service-object udp eq isakmp
object-group network OtherNetworks
network-object 10.10.10.0 255.255.255.0
network-object 10.10.12.0 255.255.255.0
network-object 10.10.14.0 255.255.255.0
network-object 10.10.16.0 255.255.255.0
access-list Public_access_in extended permit object-group VPN any any
access-list Public_access_in extended permit icmp any any echo-reply
access-list Public_access_in extended permit icmp any any time-exceeded
access-list Public_access_in extended permit icmp any any unreachable
access-list Public_access_in extended permit tcp any any eq ssh
access-list Public_access_in extended permit tcp any any eq https
access-list outside_1_cryptomap extended permit ip object-group OtherNetworks CompanyLAN 255.255.255.0
access-list inside_nat0_outbound extended permit ip object-group OtherNetworks CompanyLAN 255.255.255.0
pager lines 24
logging enable
logging asdm informational
mtu outside 1500
mtu inside 1500
mtu management 1500
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-643.bin
no asdm history enable
arp timeout 14400
nat-control
global (outside) 1 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 0.0.0.0 0.0.0.0
access-group Public_access_in in interface outside
!
router rip
version 2
!
route outside 0.0.0.0 0.0.0.0 207.145.119.149 1
route inside 10.10.12.0 255.255.255.0 10.10.10.254 1
route inside 10.10.14.0 255.255.255.0 10.10.10.254 1
route inside 10.10.16.0 255.255.255.0 10.10.10.254 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
aaa authentication ssh console LOCAL
aaa authentication http console LOCAL
aaa authentication serial console LOCAL
aaa authentication telnet console LOCAL
aaa authorization command LOCAL
http server enable
http 0.0.0.0 0.0.0.0 outside
http 192.168.1.0 255.255.255.0 management
http 0.0.0.0 0.0.0.0 inside
snmp-server host inside 10.10.10.7 community *****
snmp-server location xxx
snmp-server contact xxx
snmp-server community *****
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec transform-set Company esp-3des esp-sha-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto map outside_map 1 match address outside_1_cryptomap
crypto map outside_map 1 set pfs
crypto map outside_map 1 set peer xx.xx.xx.98
crypto map outside_map 1 set transform-set Company
crypto map outside_map interface outside
crypto isakmp identity address
crypto isakmp enable outside
crypto isakmp policy 1
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 28800
no crypto isakmp nat-traversal
telnet timeout 5
ssh 0.0.0.0 0.0.0.0 outside
ssh 0.0.0.0 0.0.0.0 inside
ssh 0.0.0.0 0.0.0.0 management
ssh timeout 5
console timeout 0
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
group-policy GroupPolicy2 internal
group-policy GroupPolicy2 attributes
vpn-tunnel-protocol IPSec
username admin password Yd.1OZbsxJ0s.vYg encrypted privilege 15
tunnel-group xx.xx.xx.98 type ipsec-l2l
tunnel-group xx.xx.xx.98 general-attributes
default-group-policy GroupPolicy2
tunnel-group xx.xx.xx.98 ipsec-attributes
pre-shared-key *
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns migrated_dns_map_1
parameters
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns migrated_dns_map_1
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
inspect pptp
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:d19d1b1b79fd0b0c4328ffe54a7d22f8
Does anything stand out as obviously wrong?
Thanks
11-01-2012 11:12 PM
Hello Kris,
The VPN config looks good. and it seems to be a routing issue to me. Just a question.. are your networks comes under ;OtherNetworks' able to access internet ? .. is something changed on their reverse routing back to company LAN subnet ?.. looks like you are receiving packet from company lan but not replying back..
regards
Harish
11-02-2012 09:41 AM
Thanks for the reply Harish,
As it turned out, the LAN interface (Ethernet0/1) of the ASA was plugged into a bad switch port. The switch port had a link light (so the interface was up and up) but no traffic was passing. We sent someone onsite to move the cable to an adjacent swiotch port and the VPN came right up.
Thanks for taking a look.
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