02-28-2012 08:08 AM - edited 03-11-2019 03:36 PM
Hi Cisco Guru's,
I hope someone can help to resolve this issue we are having with our ASA....
A little background on the setup, our LAN is connected via the inside interface (inside int & LAN are on the same subnet), we have an MPLS link connected to another interface on the ASA (mpls) with a security level of 50.
The MPLS link is for a remote site we have, all communication to this site works as it should, the only problem being I get flooded with these ASDM logs -> Deny IP Spoof from (192.168.50.31) to 192.168.102.253 on interface inside
192.168.102.253 is a core switch at the remote site.
Please see sanitised config below (possible typo's):
: Saved
!
ASA Version 8.2(5)
!
hostname UK-FW-1
domain-name company.local
enable password ********* encrypted
passwd ******** encrypted
names
name 192.168.44.0 Visitors-Wifi
name 192.168.48.0 LAN
name 192.168.50.3 Int-SFTP
name 192.168.50.133 Int-Linux_SSH
name 10.0.0.0 Servers
name 10.20.30.0 VPN
name xxx.xxx.xxx.xxx Ext-PRTG
name xxx.xxx.xxx.xxx Ext-Linux_SSH
name xxx.xxx.xxx.xxx Ext-SFTP
name 192.168.57.0 Phone-Network
name 10.255.255.248 Admin-VPN
name 172.31.0.0 Cisco-Admin
name 10.0.0.62 Int-PRTG
name 192.168.255.0 MPLS
name 192.168.103.0 Network2
name 192.168.104.0 Network3
name 192.168.105.0 Network4
name 192.168.102.0 Network1
name xxx.xxx.xxx.xxx Ext-Partner_Extranet
name 10.0.0.13 Int-Partner_Extranet
!
interface Ethernet0/0
description External Interface
nameif outside
security-level 0
ip address xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
!
interface Ethernet0/1
description Internal Interface
nameif inside
security-level 100
ip address 192.168.50.31 255.255.248.0 standby 192.168.50.30
!
interface Ethernet0/1.5
description Visitors Wifi
vlan 5
nameif visitors
security-level 25
ip address 192.168.44.1 255.255.255.0
!
interface Ethernet0/2
description MPLS
nameif mpls
security-level 50
ip address 192.168.255.254 255.255.255.0
!
interface Ethernet0/3
description LAN/STATE Failover Interface
!
interface Management0/0
shutdown
no nameif
no security-level
no ip address
management-only
!
banner login -
banner login ACCESS IS RESTRICTED TO AUTHORIZED PERSONNEL ONLY!!
banner login -
banner motd -
banner motd ACCESS IS RESTRICTED TO AUTHORIZED PERSONNEL ONLY!!
banner motd This is a privately owned computing system.
banner motd Access is permitted only by authorized employees or agents of the company.
banner motd The system may be used only for authorized company business.
banner motd Company management approval is required for all access privileges.
banner motd This system is equipped with a security system intended to prevent and
banner motd record unauthorized access attempts.
banner motd Unauthorized access or use is a crime under the law.
banner motd -
boot system disk0:/asa825-k8.bin
ftp mode passive
clock timezone GMT/BST 0
clock summer-time GMT/BDT recurring last Sun Mar 1:00 last Sun Oct 2:00
dns domain-lookup outside
dns domain-lookup inside
dns server-group DefaultDNS
name-server 192.168.50.72
name-server 192.168.50.82
name-server 8.8.8.8
domain-name company.local
object-group service Guest-tcp-group tcp
port-object eq ftp
port-object eq ftp-data
port-object eq www
port-object eq https
port-object eq imap4
port-object eq pop3
port-object eq smtp
port-object eq ssh
object-group service Guest-udp-group udp
port-object eq domain
port-object eq ntp
object-group service PRTG-Group tcp
port-object eq https
object-group service SFTP-Group tcp
port-object eq ssh
object-group network TEST
network-object Network1 255.255.255.0
network-object Network2 255.255.255.0
network-object Network3 255.255.255.0
network-object Network4 255.255.255.0
network-object 192.168.42.0 255.255.255.0
object-group service Extranet-Group tcp
port-object eq https
port-object eq www
access-list inside_outbound_nat0_acl extended permit ip LAN 255.255.248.0 VPN 255.255.255.0
access-list inside_outbound_nat0_acl extended permit ip LAN 255.255.248.0 Admin-VPN 255.255.255.248
access-list inside_outbound_nat0_acl extended permit ip LAN 255.255.248.0 object-group TEST
access-list inside_outbound_nat0_acl extended permit ip LAN 255.255.248.0 MPLS 255.255.255.0
access-list inside_outbound_nat0_acl extended permit ip Servers 255.255.255.192 VPN 255.255.255.0
access-list inside_outbound_nat0_acl extended permit ip Servers 255.255.255.192 Admin-VPN 255.255.255.248
access-list inside_outbound_nat0_acl extended permit ip Servers 255.255.255.192 object-group TEST
access-list inside_outbound_nat0_acl extended permit ip Servers 255.255.255.192 MPLS 255.255.255.0
access-list inside_outbound_nat0_acl extended permit ip Phone-Network 255.255.255.0 VPN 255.255.255.0
access-list inside_outbound_nat0_acl extended permit ip Phone-Network 255.255.255.0 Admin-VPN 255.255.255.248
access-list inside_outbound_nat0_acl extended permit ip Phone-Network 255.255.255.0 object-group TEST
access-list inside_outbound_nat0_acl extended permit ip Phone-Network 255.255.255.0 MPLS 255.255.255.0
access-list inside_outbound_nat0_acl extended permit ip Cisco-Admin 255.255.255.224 Admin-VPN 255.255.255.248
access-list split_tunnel_acl standard permit LAN 255.255.248.0
access-list split_tunnel_acl standard permit Servers 255.255.255.192
access-list split_tunnel_acl standard permit Network1 255.255.255.0
access-list split_tunnel_acl standard permit Phone-Network 255.255.255.0
access-list split_tunnel_acl standard permit Cisco-Admin 255.255.255.224
access-list split_tunnel_acl standard permit Network2 255.255.255.0
access-list split_tunnel_acl standard permit Network3 255.255.255.0
access-list split_tunnel_acl standard permit Network4 255.255.255.0
access-list outside_access_in extended permit tcp any host Ext-PRTG object-group PRTG-Group
access-list outside_access_in extended permit tcp any host Ext-SFTP object-group SFTP-Group
access-list outside_access_in extended permit tcp any host Ext-Linux_SSH object-group SFTP-Group
access-list outside_access_in extended permit tcp any host Ext-Partner_Extranet object-group Extranet-Group
access-list outside_access_in extended permit icmp any any echo-reply
access-list outside_access_in extended permit icmp any any time-exceeded
access-list outside_access_in extended deny ip any any log
access-list visitors_access_in extended permit ip any any
access-list visitors_access_in extended deny ip any any
access-list mpls_nat0_outbound extended permit ip MPLS 255.255.255.0 LAN 255.255.248.0
access-list mpls_nat0_outbound extended permit ip MPLS 255.255.255.0 Servers 255.255.255.192
access-list mpls_nat0_outbound extended permit ip MPLS 255.255.255.0 Phone-Network 255.255.255.0
access-list mpls_nat0_outbound extended permit ip object-group TEST Admin-VPN 255.255.255.248
access-list mpls_nat0_outbound extended permit ip object-group TEST VPN 255.255.255.0
access-list mpls_nat0_outbound extended permit ip object-group TEST LAN 255.255.248.0
access-list mpls_nat0_outbound extended permit ip object-group TEST Servers 255.255.255.192
access-list mpls_nat0_outbound extended permit ip object-group TEST Phone-Network 255.255.255.0
access-list mpls_acl extended permit ip any any log
access-list mpls_acl extended permit icmp any any log
access-list mpls_acl extended deny ip Network4 255.255.255.0 any
access-list mpls_acl extended deny ip any any log
access-list inside_access_in extended permit ip any any
access-list inside_access_in extended permit icmp any any
access-list inside_access_in extended deny ip any any log
pager lines 24
logging enable
logging timestamp
logging list email-alert message 716001-716002
logging list email-alert message 722022-722023
logging list email-alert message 713049
logging list email-alert message 113019
logging list email-alert message 713119-713120
logging list email-alert message 113015
logging list email-alert message 713184
logging list email-alert message 113012
logging list email-alert message 315004
logging list email-alert message 315011
logging list email-alert message 105007
logging list email-alert message 105043
logging list email-alert message 111001-111003
logging list email-alert message 111005-111006
logging list email-alert message 111008-111010
logging buffer-size 8192
logging buffered alerts
logging asdm errors
logging mail email-alert
logging from-address
logging recipient-address
level notifications
mtu outside 1500
mtu inside 1500
mtu visitors 1500
mtu mpls 1500
ip local pool VPN-Pool 10.20.30.5-10.20.30.254 mask 255.255.255.0
ip local pool VPNAdmin-Pool 10.255.255.249-10.255.255.254 mask 255.255.255.248
ip local pool SSLVPN-Pool 10.20.30.2-10.20.30.4 mask 255.255.255.0
ip verify reverse-path interface outside
failover
failover lan unit primary
failover lan interface LAN/STATE Ethernet0/3
failover key *******
failover link LAN/STATE Ethernet0/3
failover interface ip LAN/STATE 1.1.1.1 255.255.255.252 standby 1.1.1.2
monitor-interface visitors
icmp unreachable rate-limit 1 burst-size 1
icmp permit any echo inside
icmp permit any echo-reply inside
icmp permit any time-exceeded inside
icmp permit any echo visitors
icmp permit any echo-reply visitors
icmp permit any time-exceeded visitors
icmp permit any echo mpls
icmp permit any echo-reply mpls
icmp permit any time-exceeded mpls
no asdm history enable
arp timeout 14400
nat-control
global (outside) 1 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 Cisco-Admin 255.255.255.224
nat (inside) 1 Servers 255.255.255.192
nat (inside) 1 Phone-Network 255.255.255.0
nat (inside) 1 Network1 255.255.255.0
nat (inside) 1 Network2 255.255.255.0
nat (inside) 1 Network3 255.255.255.0
nat (inside) 1 Network4 255.255.255.0
nat (inside) 1 MPLS 255.255.255.0
nat (inside) 1 LAN 255.255.248.0
nat (visitors) 1 Visitors-Wifi 255.255.255.0
nat (mpls) 0 access-list mpls_nat0_outbound
nat (mpls) 1 192.168.42.0 255.255.255.0
nat (mpls) 1 Network1 255.255.255.0
nat (mpls) 1 Network2 255.255.255.0
nat (mpls) 1 Network3 255.255.255.0
nat (mpls) 1 Network4 255.255.255.0
nat (mpls) 1 MPLS 255.255.255.0
nat (mpls) 1 LAN 255.255.248.0
static (inside,outside) Ext-PRTG Int-PRTG netmask 255.255.255.255
static (inside,outside) Ext-SFTP Int-SFTP netmask 255.255.255.255
static (inside,outside) Ext-Linux_SSH Int-Linux_SSH netmask 255.255.255.255
static (outside,inside) Int-PRTG Ext-PRTG netmask 255.255.255.255
static (outside,inside) Int-SFTP Ext-SFTP netmask 255.255.255.255
static (outside,inside) Int-Linux_SSH Ext-Linux_SSH netmask 255.255.255.255
static (inside,outside) Ext-Partner_Extranet Int-Partner_Extranet netmask 255.255.255.255
static (outside,inside) Int-Partner_Extranet Ext-Partner_Extranet netmask 255.255.255.255
static (inside,mpls) LAN LAN netmask 255.255.248.0
access-group outside_access_in in interface outside
access-group inside_access_in in interface inside
access-group visitors_access_in in interface visitors
access-group mpls_acl in interface mpls
route inside Network1 255.255.255.0 192.168.50.13 1 track 1
route outside 0.0.0.0 0.0.0.0 86.188.161.81 1
route inside Servers 255.255.255.192 192.168.50.13 1
route inside Cisco-Admin 255.255.255.224 192.168.50.13 1
route mpls 192.168.42.0 255.255.255.0 192.168.255.1 1
route inside Phone-Network 255.255.255.0 192.168.50.13 1
route mpls Network1 255.255.255.0 192.168.255.1 254
route mpls Network2 255.255.255.0 192.168.255.1 1
route mpls Network3 255.255.255.0 192.168.255.1 1
route mpls Network4 255.255.255.0 192.168.255.1 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
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
webvpn
svc ask enable default svc
aaa-server ActiveDirectory protocol radius
aaa-server ActiveDirectory (inside) host 192.168.50.82
key *******
radius-common-pw *******
aaa authentication serial console LOCAL
aaa authentication http console LOCAL
aaa authentication ssh console LOCAL
aaa authorization command LOCAL
aaa local authentication attempts max-fail 5
aaa authorization exec authentication-server
no snmp-server location
no snmp-server contact
snmp-server community public
sysopt noproxyarp inside
sla monitor 1
type echo protocol ipIcmpEcho 192.168.102.253 interface inside
num-packets 3
frequency 10
sla monitor schedule 1 life forever start-time now
service resetoutside
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-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 ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto dynamic-map dmap 65535 set pfs group1
crypto dynamic-map dmap 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
crypto map imap 10 ipsec-isakmp dynamic dmap
crypto map imap interface outside
crypto ca trustpoint localtrust
enrollment self
fqdn xxx.xxx.xxx.xxx
subject-name CN=xxx.xxx.xxx.xxx
keypair sslvpnkey
crl configure
crypto ca certificate chain localtrust
<cert removed>
quit
crypto isakmp enable outside
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash md5
group 2
lifetime 86400
crypto isakmp policy 65535
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
!
track 1 rtr 1 reachability
no vpn-addr-assign dhcp
telnet timeout 1
console timeout 15
management-access inside
dhcpd address 192.168.44.100-192.168.44.254 visitors
dhcpd dns 8.8.8.8 8.8.4.4 interface visitors
dhcpd domain company.net interface visitors
dhcpd enable visitors
!
threat-detection basic-threat
threat-detection scanning-threat shun except ip-address 192.168.50.72 255.255.255.255
threat-detection scanning-threat shun except ip-address 192.168.50.82 255.255.255.255
threat-detection scanning-threat shun duration 3600
threat-detection statistics port
threat-detection statistics protocol
threat-detection statistics access-list
threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200
ntp server 212.13.197.135 prefer
ntp server 192.168.50.72
ssl trust-point localtrust outside
webvpn
enable outside
svc image disk0:/anyconnect-win-2.5.3055-k9.pkg 1
svc image disk0:/anyconnect-macosx-i386-2.5.3055-k9.pkg 2
svc image disk0:/anyconnect-linux-2.5.3055-k9.pkg 3
svc enable
tunnel-group-list enable
group-policy SSLVPNUsers internal
group-policy SSLVPNUsers attributes
wins-server none
dns-server value 192.168.50.72 192.168.50.82
vpn-simultaneous-logins 3
vpn-idle-timeout 30
vpn-session-timeout 240
vpn-tunnel-protocol webvpn
group-lock value SSLVPN
split-tunnel-policy tunnelspecified
split-tunnel-network-list value split_tunnel_acl
default-domain value company.local
address-pools value SSLVPN-Pool
webvpn
svc ask none default svc
customization value DfltCustomization
group-policy DfltGrpPoicy internal
group-policy DfltGrpPoicy attributes
dns-server value 192.168.50.72 192.168.50.82
group-policy VPNAdmin internal
group-policy VPNAdmin attributes
dns-server value 192.168.50.72 192.168.50.82
vpn-simultaneous-logins 6
vpn-idle-timeout 15
vpn-session-timeout 120
vpn-tunnel-protocol IPSec l2tp-ipsec webvpn
split-tunnel-policy tunnelspecified
split-tunnel-network-list value split_tunnel_acl
default-domain value company.local
group-policy VPNUsers internal
group-policy VPNUsers attributes
dns-server value 192.168.50.72 192.168.50.82
vpn-simultaneous-logins 200
vpn-idle-timeout 60
vpn-session-timeout 480
vpn-tunnel-protocol IPSec l2tp-ipsec webvpn
split-tunnel-policy tunnelspecified
split-tunnel-network-list value split_tunnel_acl
default-domain value company.local
group-policy VPNRadius internal
group-policy VPNRadius attributes
dns-server value 192.168.50.72 192.168.50.82
vpn-simultaneous-logins 250
vpn-idle-timeout 60
vpn-session-timeout 480
vpn-tunnel-protocol IPSec l2tp-ipsec webvpn
split-tunnel-policy tunnelspecified
split-tunnel-network-list value split_tunnel_acl
default-domain value company.local
vpn-group-policy VPNUsers
service-type remote-access
tunnel-group DefaultWEBVPNGroup general-attributes
authentication-server-group ActiveDirectory
tunnel-group VPNUsers type remote-access
tunnel-group VPNUsers general-attributes
address-pool VPN-Pool
default-group-policy VPNUsers
tunnel-group VPNUsers ipsec-attributes
pre-shared-key *********
tunnel-group VPNRadius type remote-access
tunnel-group VPNRadius general-attributes
address-pool VPN-Pool
authentication-server-group ActiveDirectory
default-group-policy VPNRadius
tunnel-group VPNRadius ipsec-attributes
pre-shared-key *********
tunnel-group VPNAdmin type remote-access
tunnel-group VPNAdmin general-attributes
address-pool VPNAdmin-Pool
default-group-policy VPNAdmin
tunnel-group VPNAdmin ipsec-attributes
pre-shared-key **********
tunnel-group SSLVPN type remote-access
tunnel-group SSLVPN general-attributes
address-pool SSLVPN-Pool
authentication-server-group ActiveDirectory
default-group-policy SSLVPNUsers
tunnel-group SSLVPN webvpn-attributes
group-alias AnyConnect enable
!
class-map inspection_default
match default-inspection-traffic
class-map qos
match access-list visitors_access_in
!
!
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 netbios
inspect rsh
inspect rtsp
inspect skinny
inspect esmtp
inspect sqlnet
inspect sunrpc
inspect tftp
inspect xdmcp
inspect icmp
inspect ip-options
class class-default
set connection decrement-ttl
policy-map qos
class qos
police input 5000000
police output 5000000
!
service-policy global_policy global
service-policy qos interface visitors
smtp-server xxx.xxx.xxx.xxx
prompt hostname context
no call-home reporting anonymous
: end
Many thanks in advance.
Zeb.
Solved! Go to Solution.
02-29-2012 08:04 AM
Zeb,
Your issue is with the SLA monitor and tracking...
-----------
name 192.168.102.0 Network1
route inside Network1 255.255.255.0 192.168.50.13 1 track 1
route mpls Network1 255.255.255.0 192.168.255.1 254
track 1 rtr 1 reachability
sla monitor 1
type echo protocol ipIcmpEcho 192.168.102.253 interface inside
num-packets 3
frequency 10
sla monitor schedule 1 life forever start-time now
-----------
You're tracking an inside route to Network1 using the inside interface but the ping test is going to the core switch at 192.168.102.253 which is in the mpls network. This is impossible.
Turn off your SLA monitor and I bet the logs stop.
I'm not sure what requirement you are trying to meet with the tracking. Either 192.168.102.0/24 is off the inside interface or its off the mpls interface. It can not be both.
02-28-2012 10:08 AM
Zeb,
You've got some NAT statements setup for inside > MPLS traffic.. do you have any normal, expected traffic to the core switch at 192.168.102.253? If so, what kind of traffic is it?
Are you getting any other logs in about the same frequency as the deny IP spoofs?
Thanks
Joey
02-29-2012 12:59 AM
Hi Joey,
We have servers at both sites running file backups etc. however the core switch shouldn't be getting any other traffic.
The backup generally runs for an hour or so late in the evening, so seeing these logs is very strange.
These 2 log shows up in between the IP spoof logs
-> 192.168.50.13 Denied ICMP type=5, code=0 from 192.168.50.13 on interface inside
-> 192.168.50.31 4527 192.168.102.253 0 Built outbound ICMP connection for faddr 192.168.102.253/0 gaddr 192.168.50.31/4527 laddr 192.168.50.31/4527
I do have an IP SLA Monitor set up on the ASA that pings 192.168.102.253, but those pings shouldn't be coming from 192.168.50.13
Many thanks.
Zeb.
02-29-2012 08:04 AM
Zeb,
Your issue is with the SLA monitor and tracking...
-----------
name 192.168.102.0 Network1
route inside Network1 255.255.255.0 192.168.50.13 1 track 1
route mpls Network1 255.255.255.0 192.168.255.1 254
track 1 rtr 1 reachability
sla monitor 1
type echo protocol ipIcmpEcho 192.168.102.253 interface inside
num-packets 3
frequency 10
sla monitor schedule 1 life forever start-time now
-----------
You're tracking an inside route to Network1 using the inside interface but the ping test is going to the core switch at 192.168.102.253 which is in the mpls network. This is impossible.
Turn off your SLA monitor and I bet the logs stop.
I'm not sure what requirement you are trying to meet with the tracking. Either 192.168.102.0/24 is off the inside interface or its off the mpls interface. It can not be both.
02-29-2012 09:11 AM
Joey,
Many thanks for your answer, you were spot on total genius......
The reason the IP SLA Monitor was set up was to swap the route from inside to mpls, the remote site gets pulled down and moved back to the factory on a regular basis (we are a motorsport team) & it is then connected to the inside lan on a Vlan.
We were trying to get the route change automated as to not make our lives to complex.
If you have any ideas how I can do this, I would love to hear them.
Many many thanks for helping with the ip spoof issue.
Zeb.
02-29-2012 09:20 AM
Zeb,
Glad I could help!
It's possible that your SLA monitoring could do the job you want it to do. Obviously right now the 192.168.102.x network is off the mpls interface, but if it were suddenly available via the inside, the SLA monitor might indeed install the inside route and all would be well again.
The problem with the logs is just because the SLA monitor will continue to try pinging 192.168.102.253 from the inside even if it's not there. So you'll continue to get weird log messages.
That being said, the SLA monitor setup may work, but you'll have to deal with the fact that the ASA is going to complain that something isn't right.
Thanks!
Joey
02-29-2012 09:27 AM
Joey,
I am thinking of reducing num-packets & set frequency to 10-15 minutes or so, that way I should olny get a few logs now and again.
Now I know what is causing the issue it isn't so worrying!
I very much appreciate your help and input on this matter.
Cheers,
Zeb.
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