3000 Concentrator & 506e PIX: AES Tunnels

Posted on 2006-06-28
Medium Priority
Last Modified: 2010-04-12
Up until this point, my company has been doing our VPN by the "leave it at the defaults and it just works" method.  We have a number of remote sites that tunnel all traffic to our central site.  At each remote site is a PIX 506e and at the central site, a 3005 Concentrator.

Needless to say, I'm pretty inexperienced at any kind of more advanced setups and am probably just missing something simple.

For performance reasons, we want to go to AES tunnels from 3DES and to learn what I'm actually doing, I'm doing this using the CLI of the PIX.

I've gotten everything configured to the best of my abilities and it's still not working.  Please help!

I'm doing this in a lab network.  Here's what it looks like, roughly:

Here are the relevant config screens off of my Concentrator:
  The L2L Tunnel Config Page:

  The IKE Config Page:

  The SA Config Page:

Last, but certainly not least, the PIX config is attached at the bottom.

Please help!

PIX Version 6.3(1)
interface ethernet0 auto
interface ethernet1 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password gigu2cdr1NrbpYtD encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname PIX
domain-name mycompany.com
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
access-list TUNNEL permit ip any
pager lines 24
logging on
logging buffered warnings
mtu outside 1500
mtu inside 1500
ip address outside
ip address inside
ip audit info action alarm
ip audit attack action alarm
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list TUNNEL
nat (inside) 1 0 0
route outside 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http outside
http inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
crypto ipsec transform-set sits_transform_set esp-aes-256 esp-sha-hmac
crypto map test_map 10 ipsec-isakmp
crypto map test_map 10 match address TUNNEL
crypto map test_map 10 set peer
crypto map test_map 10 set transform-set sits_transform_set
crypto map test_map interface outside
isakmp enable outside
isakmp key ******** address netmask
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption aes-256
isakmp policy 10 hash sha
isakmp policy 10 group 5
isakmp policy 10 lifetime 86400
telnet timeout 5
ssh timeout 5
console timeout 0
terminal width 80
: end
Question by:titan6400
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LVL 79

Accepted Solution

lrmoore earned 900 total points
ID: 17008277
>PIX Version 6.3(1)
Very buggy version of OS. Suggest you get the latest 6.3(5)
Can you post result of 'show cry is sa' from the PIX?
Also result of 'show cry ip sa'

It may be a routing issue on the 3005.
PIX points to as its default gateway
3005 points someplace else as its gateway?

>access-list TUNNEL permit ip any
You want the tunnel acl to match the concentrator's tunnel list and you don't want to use 'any' on either the concentrator or the pix.
access-list TUNNEL permit ip <local lan subnet> <mask> <remote lan subnet> <mask>

Looking at your Tunnel_Page2.png - You have as the Local Network and "any" as the remote network. You also have assigned to the inside of the PIX.
The Remote network (behind the PIX) is

Author Comment

ID: 17012252
Yes, I actually figured this one out last night and was going to have the question closed this AM.  Anyway, it was an issue of having the local and remote networks reversed as well as a couple other little nitpicky things that I figured out with debug crypto isakmp.

Why do you recommend against having the "any" keyword at the end of the TUNNEL ACL?  I am trying to use this tunnel to route all traffic from the network to anywhere else to the concentrator (Internet traffic, the whole deal), so I put in as the remote network on that ACL.  The PIX automatically translated this to "any".

Is there a problem with that?
LVL 79

Expert Comment

ID: 17013741
If you want all traffic encrypted and force Internet access through this same tunnel then you really must use "any". This is just not typical of any setup. Most companies with this desire to control Internet access from a central location just use a proxy server..
IPSEC VPN's want to be as precise as possible and "any" is difficult to troubleshoot.

Author Comment

ID: 17013792
Well, with our setup we literally want any traffic that isn't destined for that local office's subnet to be tunneled to our primary office.

It's got nothing to do with controlling Internet acess or anything like that, it's more to do corporate policies and crap like that which I'm really not inclined to get into.

Anyway, it's the way it's got to be and I appreciate your help in troubleshooting the actual technical problem.
LVL 79

Expert Comment

ID: 17013824
You have to do what you have to do sometimes. I understand.
- Cheers!

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