Question

Remote VPN to Cisco ASA 5520 not encrypting traffic

Asked by: rigneydolphin

Hi,

I have setup a VPN on our Cisco ASA 5520 but seem to be having an issue.

When I connect from the client it goes through Phase 1 and Phase 2 fine, no problems.

It accepts my username and password fine. I show on the ASA as being connected.

The issue is though that I cant ping through the tunnel or actaully send any data through the VPN, it looks that data isnt being encrypted or making it through.

When I check status on the VPN client it shows

Bytes received= 0
Bytes Sent = 8454

Packets Encrypted = 99
Packets Decrypted = 0

etc

While on the ASA side

Bytes Tx = 960

 #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0
      #pkts decaps: 111, #pkts decrypt: 111, #pkts verify: 111

It's as if traffic isnt being picking up by the cryptomap.

If anybody has any high level ideas id appreciate them or if anybody can help il gladly post some sanitized configs.

Thanks

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Asked On
2009-07-30 at 10:23:23ID24613785
Tags

Cisco VPN Remote ASA 5520 Cryptomap enrypted packets

Topics

IPSec Security Protocol

,

Cisco PIX Firewall

Participating Experts
3
Points
500
Comments
8

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Answers

 

by: MikeKanePosted on 2009-07-30 at 10:41:34ID: 24982349

Is this a site 2 site connection or client to site connection?   If its client, are you using the VPN client or the anyconnect client?  What version of ASA code are you running?

Post the config and we can have a look.  

 

by: Jay_GridleyPosted on 2009-07-30 at 23:07:32ID: 24986634

This will probably be a problem with your NAT Traversal.

Try adding either this line:
isakmp nat-traversal 20
or
crypto isakmp nat-traversal 20

(depending on pre or post OS version 7.2)
If it doesn't help the config would be helpfull.

JG

 

by: decoleurPosted on 2009-07-31 at 11:13:14ID: 24991102

look at the acl that defines interesting traffic for the VPn as well as the identity nat (nat 0). it should be mirrored on both sides.

when we see one way traffic it is typically because the traffic that is identified in the identity nat is incomplete.

hope this helps,

-t

 

by: Jay_GridleyPosted on 2009-07-31 at 14:06:54ID: 24992458

@ decoleur:
I would agree with your advise, however I think TS does not have a site to site, but a remote access VPN. in that case should the NAT0 be incorrect, there wouldn't be any decaps at the ASA...

 

by: decoleurPosted on 2009-07-31 at 17:32:51ID: 24993521

@Jay, I think I see it a little differently

I interpret the decaps on the asa without encaps to indicate that traffic is being received by the asa over the secure channel but that is it not going out it.

As a test connect a client and from behind the ASA try to ping the client's secure IP address. my guess is that the debugs will show that the traffic is going out the default route and not going over the secure channel because it is not matching the interesting traffic on the NAT0 acl. or the access-list in the crypto map id incorrect.

please post a clean version of your vpn config with the ACLs, the crypto maps, and the nat commands.

we should be able to get to the bottom of this pretty quickly with the running config.

-t

 

by: rigneydolphinPosted on 2009-09-16 at 08:29:36ID: 25346692

Hi,

Thanks you all for your suggestions. I have had to put this issue on the back burner for the last number of weeks, but I am back to it now :-(

I've included the sanitized config below, I've removed some ACL's which I hope doesn't create added confusion.

It is indeed a remote access VPN. I have some questions though. How do I know which ACL defines interesting traffic for my VPN? How do the nat (inside) statements get processed?

Config:



ASA Version 7.0(8)
!
hostname *******
domain-name i*********

names
dns-guard
!
interface GigabitEthernet0/0
 nameif outside
 security-level 0
 ip address 84.XX.YY.98 255.255.255.0
!
interface GigabitEthernet0/1
 nameif inside
 security-level 100
 ip address 10.xx.yy.zz 255.255.255.0
!
interface GigabitEthernet0/2
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet0/3
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Management0/0
 nameif management
 security-level 100
 ip address 192.168.1.1 255.255.255.0
 management-only
!
banner login
banner motd ****Unauthorized Users Logoff Immediately******
no ftp mode passive
clock timezone GMT/IST 0
clock summer-time GMT/IDT recurring last Sun Mar 1:00 last Sun Oct 2:00
object-group service HTTPHTTPS tcp
 port-object eq www
 port-object eq https
object-group service thG tcp
 description three Service Group
 port-object range 60510 60510
 port-object eq www
 port-object eq https
object-group service Pup tcp
 port-object eq echo
 port-object eq www
 port-object range 6969 6969
 port-object eq ssh
 port-object eq ftp-data
 port-object eq rsh
 port-object eq https
 port-object eq ftp
 port-object range 60510 60510
 port-object range 11110 11112
object-group service EamonnF tcp
 port-object eq telnet
 port-object eq www
 port-object eq https
 port-object eq ftp
object-group service P tcp
 port-object range 5900 5900
object-group service UC tcp
 port-object range 5910 5910
object-group service AB tcp
 port-object range 5911 5911
object-group service R00 tcp
 port-object range 2200 2200
object-group service PB tcp
 description Access 10.0.xx.yy
 port-object eq 5900
 port-object eq 5800
object-group service Ud tcp
 port-object eq 5910
 port-object eq 5810
access-list inside_nat0_outbound extended permit ip xx.yy.zz.0 255.255.255.0 192.NN.RR.48 255.255.255.240
access-list inside_nat0_outbound extended permit ip xx.yy.zz.0 255.255.255.0 192.SS.YY.64255.255.255.240
access-list inside_nat0_outbound extended permit ip 10.HH.GG.SS 255.255.255.0 192.NN.RR.48 255.255.255.240
access-list inside_nat0_outbound extended permit ip 10.HH.GG.SS 255.255.255.0 192.SS.YY.64255.255.255.240
access-list inside_nat0_outbound extended permit ip xx.yy.zz.0 255.255.255.0 10.AA.BB.CC 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.HH.GG.SS 255.255.255.0 10.AA.BB.CC 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.SS.LL.EE 255.255.255.0 10.AA.BB.CC 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.AA.BB.CC 255.255.255.0 10.AA.BB.CC 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.SS.GG.DD 255.255.255.0 10.AA.BB.CC 255.255.255.0
access-list inside_nat0_outbound extended permit ip xx.yy.zz.0 255.255.255.0 10.AA.BB.CC 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.AA.JJ.XX 255.255.255.0 10.AA.BB.CC 255.255.255.0
access-list inside_nat0_outbound extended permit ip 10.HH.BB.FF 255.255.255.0 10.AA.BB.CC 255.255.255.0
access-list inside_nat0_outbound extended permit ip xx.yy.zz.192 255.255.255.248 host 172.FF.GG.13
access-list outside_cryptomap_20 extended permit ip 84.XX.RR.0 255.255.255.0 192.NN.RR.48 255.255.255.240
access-list outside_cryptomap_20 extended permit ip 84.XX.RR.0 255.255.255.0 192.SS.YY.64255.255.255.240
access-list NO_NAT extended permit ip xx.yy.zz.0 255.255.255.0 192.NN.RR.48 255.255.255.240
access-list NO_NAT extended permit ip xx.yy.zz.0 255.255.255.0 192.SS.YY.64255.255.255.240
access-list NO_NAT extended permit ip 10.HH.GG.SS 255.255.255.0 192.NN.RR.48 255.255.255.240
access-list NO_NAT extended permit ip 10.HH.GG.SS 255.255.255.0 192.SS.YY.64255.255.255.240
access-list NO_NAT extended permit ip xx.yy.zz.0 255.255.255.0 host 172.FF.GG.13
access-list NO_NAT extended permit ip xx.yy.zz.0 255.255.255.0 10.RR.dd.EE 255.255.255.0
access-list NO_NAT extended permit ip 10.HH.GG.SS 255.255.255.0 10.RR.dd.EE 255.255.255.0
access-list RDGVPN_splitTunnelAcl standard permit xx.yy.zz.0 255.255.255.0
access-list RDGVPN_splitTunnelAcl standard permit 10.HH.GG.SS 255.255.255.0
access-list RDGVPN_splitTunnelAcl standard permit xx.yy.zz.0 255.255.255.0
access-list RDGVPN_splitTunnelAcl standard permit 10.AA.JJ.XX 255.255.255.0
access-list inside_nat0_outbound_V1 extended permit ip xx.yy.zz.0 255.255.255.0 host 192.SS.LL.40
access-list inside_nat0_outbound_V1 extended permit ip 10.HH.GG.SS 255.255.255.0 host 192.SS.LL.40
access-list inside_nat0_outbound_V2 extended permit ip xx.yy.zz.0 255.255.255.0 host 192.SS.LL.40
access-list inside_nat0_outbound_V2 extended permit ip 10.HH.GG.SS 255.255.255.0 host 192.SS.LL.40
access-list inside_nat0_outbound_V3 extended permit ip 10.HH.GG.SS 255.255.255.0 host 192.SS.LL.40
access-list inside_nat0_outbound_V3 extended permit ip xx.yy.zz.0 255.255.255.0 host 192.SS.LL.40
access-list outside_cryptomap_40_1 extended permit ip host 84.203.232.99 host 192.SS.LL.40
access-list outside_cryptomap_40_1 extended permit ip host 84.203.232.99 host 192.125.241.42
access-list VF_NAT extended permit ip xx.yy.zz.0 255.255.255.0 host 192.SS.LL.40
access-list VF_NAT extended permit ip xx.yy.zz.0 255.255.255.0 host 192.125.241.42
access-list VF_NAT extended permit ip 10.HH.GG.SS 255.255.255.0 host 192.SS.LL.40
access-list VF_NAT extended permit ip 10.HH.GG.SS 255.255.255.0 host 192.125.241.42
access-list inside_pnat_inbound_V1 extended permit ip xx.yy.zz.0 255.255.255.0 host 172.AA.DD.182
access-list inside_pnat_inbound_V2 extended permit ip xx.yy.zz.0 255.255.255.0 host 172.AA.DD.182
access-list inside_pnat_inbound_V3 extended permit ip xx.yy.zz.0 255.255.255.0 host 172.AA.DD.182
access-list inside_pnat_inbound_V4 extended permit ip any any
access-list outisde_cryptomap_60_1 extended permit ip host 84.203.232.100 host 217.SS.EE.188
access-list no-nat extended permit ip 10.7.7.0 255.255.255.0 172.18.1.0 255.255.255.0
access-list outisde_cryptomap_60 extended permit ip host 84.203.232.100 host 217.SS.EE.188
access-list THREE_NAT extended permit ip xx.yy.zz.0 255.255.255.0 host 217.SS.EE.188
access-list THREE_NAT extended permit ip 10.HH.GG.SS 255.255.255.0 host 217.SS.EE.188
access-list outside_cryptomap_THREE extended permit ip host 84.203.232.100 host 217.SS.EE.188
access-list inside_nat0_outbound_V4 extended permit ip xx.yy.zz.192 255.255.255.248 host 172.FF.GG.13
access-list inside_nat0_outbound_V4 extended permit ip any 10.RR.dd.EE 255.255.255.128
access-list inside_nat0_outbound_V4 extended permit ip xx.yy.zz.0 255.255.255.0 10.RR.dd.EE 255.255.255.128
access-list inside_nat0_outbound_V4 extended permit ip 10.HH.GG.SS 255.255.255.0 10.RR.dd.EE 255.255.255.128
access-list outside_cryptomap_80 extended permit ip xx.yy.zz.192 255.255.255.248 host 172.FF.GG.13
pager lines 24
logging enable
logging list EMail level debugging class email
logging list Deny106023 message 106023
logging list VPNClientTraffic level debugging class vpnc
logging list VPN_IKE_IPSEC level debugging class vpn
logging trap notifications
logging asdm debugging
logging from-address ppower@rigneydolphin.ie
logging recipient-address ppower@rigneydolphin.ie level emergencies
logging host inside xx.yy.zz.5 17/55555
mtu outside 1500
mtu inside 1500
mtu management 1500
ip local pool VPNpool 10.0.14.50-10.0.14.100 mask 255.255.255.0
no failover
monitor-interface outside
monitor-interface inside
monitor-interface management
icmp deny any outside
icmp permit any inside
asdm image disk0:/asdm-508.bin
no asdm history enable
arp timeout 14400
global (outside) 10 interface
global (outside) 20 84.XX.YY.99
global (outside) 30 84.XX.YY.100
nat (inside) 0 access-list inside_nat0_outbound_V4
nat (inside) 20 access-list VF_NAT
nat (inside) 30 access-list THREE_NAT
nat (inside) 10 0.0.0.0 0.0.0.0
static (inside,outside) tcp 84.203.232.102 smtp xx.yy.zz.35 smtp netmask 255.255.255.255
static (inside,outside) tcp interface imap4 xx.yy.zz.9 imap4 netmask 255.255.255.255
static (inside,outside) tcp interface smtp xx.yy.zz.9 smtp netmask 255.255.255.255
static (inside,outside) tcp interface www xx.yy.zz.16 www netmask 255.255.255.255
static (inside,outside) tcp interface telnet xx.yy.zz.14 telnet netmask 255.255.255.255
static (inside,outside) tcp interface 5902 xx.yy.zz.33 5902 netmask 255.255.255.255
static (inside,outside) tcp interface ftp xx.yy.zz.8 ftp netmask 255.255.255.255
static (inside,outside) tcp 84.203.232.101 www xx.yy.zz.8 www netmask 255.255.255.255
static (inside,outside) tcp interface 7000 xx.yy.zz.8 7000 netmask 255.255.255.255
static (inside,outside) tcp interface 11111 xx.yy.zz.140 11111 netmask 255.255.255.255
static (inside,outside) tcp interface 5800 xx.yy.zz.17 5800 netmask 255.255.255.255
static (inside,outside) tcp interface 5000 xx.yy.zz.216 5000 netmask 255.255.255.255
static (inside,outside) tcp interface 5910 10.0.25.12 5910 netmask 255.255.255.255
static (inside,outside) tcp interface 5911 xx.yy.zz.36 5911 netmask 255.255.255.255
static (inside,outside) tcp interface 5900 xx.yy.zz.17 5900 netmask 255.255.255.255
static (inside,outside) tcp interface 5810 10.0.25.12 5810 netmask 255.255.255.255
static (inside,outside) tcp 84.203.232.108 ssh xx.yy.zz.9 ssh netmask 255.255.255.255
static (inside,outside) tcp interface ssh xx.yy.zz.100 ssh netmask 255.255.255.255
access-group outside_access_in in interface outside
access-group inside_access_in in interface inside
route outside 10.RR.dd.EE 255.255.255.0 84.203.232.97 1
route outside 0.0.0.0 0.0.0.0 84.XX.YY.97 1
route inside 10.10.10.0 255.255.255.0 xx.yy.zz.11 1
route inside 10.0.0.0 255.255.0.0 xx.yy.zz.11 1
route inside 10.118.180.0 255.255.255.0 xx.yy.zz.11 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
timeout mgcp-pat 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
group-policy DfltGrpPolicy attributes
 banner none
 wins-server none
 dns-server none
 dhcp-network-scope none
 vpn-access-hours none
 vpn-simultaneous-logins 3
 vpn-idle-timeout none
 vpn-session-timeout none
 vpn-filter none
 vpn-tunnel-protocol IPSec webvpn
 password-storage disable
 ip-comp disable
 re-xauth disable
 group-lock none
 pfs disable
 ipsec-udp disable
 ipsec-udp-port 10000
 split-tunnel-policy tunnelall
 split-tunnel-network-list none
 default-domain none
 split-dns none
 secure-unit-authentication disable
 user-authentication disable
 user-authentication-idle-timeout 30
 ip-phone-bypass disable
 leap-bypass disable
 nem disable
 backup-servers keep-client-config
 client-firewall none
 client-access-rule none
 webvpn
  functions url-entry
  port-forward-name value Application Access
group-policy RDGVPN internal
group-policy RDGVPN attributes
 wins-server value xx.yy.zz.8 xx.yy.zz.25
 dns-server value xx.yy.zz.25 xx.yy.zz.8
 split-tunnel-policy tunnelspecified
 split-tunnel-network-list value RDGVPN_splitTunnelAcl
 default-domain value iota.local
 webvpn
username paddy password MGw7SEoIbk2881cu encrypted privilege 15
username acurtis password E04klAFyzTZnUUcg encrypted privilege 15
username acurtis attributes
 vpn-group-policy DfltGrpPolicy
 webvpn
username punit password S4RWteIFsrKNdrRp encrypted privilege 0
username punit attributes
 vpn-group-policy RDGVPN
 webvpn
http server enable
http xx.yy.zz.0 255.255.255.0 inside
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-SHA
crypto dynamic-map outside_dyn_map 20 set security-association lifetime seconds 28800
crypto dynamic-map outside_dyn_map 20 set security-association lifetime kilobytes 4608000
crypto dynamic-map outside_dyn_map 40 set transform-set ESP-3DES-SHA
crypto dynamic-map outside_dyn_map 40 set security-association lifetime seconds 28800
crypto dynamic-map outside_dyn_map 40 set security-association lifetime kilobytes 4608000
crypto dynamic-map outside_dyn_map 60 set transform-set ESP-3DES-SHA
crypto dynamic-map outside_dyn_map 60 set security-association lifetime seconds 28800
crypto dynamic-map outside_dyn_map 60 set security-association lifetime kilobytes 4608000
crypto map outside_map 20 match address outside_cryptomap_20
crypto map outside_map 20 set peer 82.HH.JJ.199
crypto map outside_map 20 set transform-set ESP-3DES-MD5
crypto map outside_map 20 set security-association lifetime seconds 28800
crypto map outside_map 20 set security-association lifetime kilobytes 4608000
crypto map outside_map 40 match address outside_cryptomap_40_1
crypto map outside_map 40 set peer 213.KK.DD.244
crypto map outside_map 40 set transform-set ESP-3DES-SHA
crypto map outside_map 40 set security-association lifetime seconds 28800
crypto map outside_map 40 set security-association lifetime kilobytes 4608000
crypto map outside_map 60 match address outside_cryptomap_THREE
crypto map outside_map 60 set peer 217.FF.GG.241
crypto map outside_map 60 set transform-set ESP-3DES-SHA
crypto map outside_map 60 set security-association lifetime seconds 28800
crypto map outside_map 60 set security-association lifetime kilobytes 4608000
crypto map outside_map 80 match address outside_cryptomap_80
crypto map outside_map 80 set peer 213.TT.FF.130
crypto map outside_map 80 set transform-set ESP-DES-MD5
crypto map outside_map 80 set security-association lifetime seconds 28800
crypto map outside_map 80 set security-association lifetime kilobytes 4608000
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map interface outside
crypto map crypto_three 70 set security-association lifetime seconds 28800
crypto map crypto_three 70 set security-association lifetime kilobytes 4608000
isakmp enable outside
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption 3des
isakmp policy 10 hash sha
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
isakmp policy 30 authentication pre-share
isakmp policy 30 encryption des
isakmp policy 30 hash sha
isakmp policy 30 group 2
isakmp policy 30 lifetime 86400
isakmp policy 50 authentication pre-share
isakmp policy 50 encryption des
isakmp policy 50 hash md5
isakmp policy 50 group 2
isakmp policy 50 lifetime 86400
isakmp nat-traversal  20
tunnel-group 82.HH.JJ.199 type ipsec-l2l
tunnel-group 82.HH.JJ.199 ipsec-attributes
 pre-shared-key *
tunnel-group 213.KK.DD.244 type ipsec-l2l
tunnel-group 213.KK.DD.244 ipsec-attributes
 pre-shared-key *
tunnel-group 217.FF.GG.241 type ipsec-l2l
tunnel-group 217.FF.GG.241 ipsec-attributes
 pre-shared-key *
tunnel-group 213.TT.FF.130 type ipsec-l2l
tunnel-group 213.TT.FF.130 ipsec-attributes
 pre-shared-key *
tunnel-group RDGVPN type ipsec-ra
tunnel-group RDGVPN general-attributes
 address-pool (inside) VPNpool
 address-pool VPNpool
 default-group-policy RDGVPN
tunnel-group RDGVPN ipsec-attributes
 pre-shared-key *
telnet xx.yy.zz.0 255.255.255.0 inside
telnet 192.168.1.0 255.255.255.0 management
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd lease 3600
dhcpd ping_timeout 50
dhcpd enable management
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map global_policy
 class inspection_default
  inspect dns maximum-length 512
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect rsh
  inspect rtsp
  inspect sqlnet
  inspect skinny
  inspect sunrpc
  inspect xdmcp
  inspect sip
  inspect netbios
  inspect tftp
!
service-policy global_policy global
ntp server xx.yy.zz.11
tftp-server inside xx.yy.zz.30 test1016.cfg
smtp-server xx.yy.zz.9
Cryptochecksum:

 

by: rigneydolphinPosted on 2009-09-16 at 08:33:52ID: 25346740

I also have logging from ASA when I tried to connect last, hope this might also help

 

by: decoleurPosted on 2009-09-16 at 11:31:12ID: 25348594

I have some questions though. How do I know which ACL defines interesting traffic for my VPN?

the acls of interest for your issue are the following
split-tunnel-network-list value RDGVPN_splitTunnelAcl, which is:
access-list RDGVPN_splitTunnelAcl standard permit xx.yy.zz.0 255.255.255.0
access-list RDGVPN_splitTunnelAcl standard permit 10.HH.GG.SS 255.255.255.0
access-list RDGVPN_splitTunnelAcl standard permit xx.yy.zz.0 255.255.255.0
access-list RDGVPN_splitTunnelAcl standard permit 10.AA.JJ.XX 255.255.255.0

and the identity nat:
nat (inside) 0 access-list inside_nat0_outbound_V4, which is:
access-list inside_nat0_outbound_V4 extended permit ip xx.yy.zz.192 255.255.255.248 host 172.FF.GG.13
access-list inside_nat0_outbound_V4 extended permit ip any 10.RR.dd.EE 255.255.255.128
access-list inside_nat0_outbound_V4 extended permit ip xx.yy.zz.0 255.255.255.0 10.RR.dd.EE 255.255.255.128
access-list inside_nat0_outbound_V4 extended permit ip 10.HH.GG.SS 255.255.255.0 10.RR.dd.EE 255.255.255.128

for this to work you have to have something in the identity nat that says traffic from the networks in the split tunnel are allowed to go to the range 10.0.14.0/24
like:
access-list inside_nat0_outbound_V4 extended permit ip  xx.yy.zz.0 255.255.255.0 10.0.14.0 255.255.255.0

this makes it so that traffic is not translated on the outside interface and is routed over the tunnel.

How do the nat (inside) statements get processed?
this has no bearing on the vpn because the hosts are considered an extension of the network.

hope this helps,

-t

20120131-EE-VQP-002

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