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Network Security Firewalls
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Re: NAT and bypass NAT for IPSEC

Subject: Re: NAT and bypass NAT for IPSEC
Date: Sat, 1 Apr 2006 11:44:05 -0500
Yes there is an dynamically assigned IP address for outside interface...


On 3/31/06, david.byrne@bt.com <david.byrne@bt.com> wrote:

 Hi Ee,

can you confirm you have an outside IP address to PAT to?

Dave

 ------------------------------
*From:* Ercan Elibol [mailto:ercanelibol@gmail.com]
*Sent:* 25 March 2006 19:24
*To:* firewalls@securityfocus.com

*Subject:* NAT and bypass NAT for IPSEC


 I wanted to have a NAT config and bypass NAT for VOIP using IPSEC
traffic, so I created a dhcp pool and and ACLs only for IPSEC. following
configuration is only working for VOIP phone. NAT  1 does not work. can
anyone see what is wrong?

thank you

Ee


PIX Version 6.3(4)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100

access-list 101 permit ip host 10.168.20.17 10.168.10.0 255.255.255.128
access-list 101 permit ip host 10.168.20.17 10.168.17.0 255.255.255.0
access-list 101 permit ip host 10.168.20.17 10.168.11.0 255.255.255.0

ip address outside dhcp setroute
ip address inside 10.168.20.22 255.255.255.248

global (outside) 1 interface
nat (inside) 0 access-list 101
nat (inside) 1 10.168.20.18 255.255.255.255 0 0

sysopt connection permit-ipsec
crypto ipsec transform-set myset esp-des esp-md5-hmac
crypto map newmap 10 ipsec-isakmp
crypto map newmap 10 match address 101
crypto map newmap 10 set peer 11.27.19.20
crypto map newmap 10 set transform-set myset
crypto map newmap interface outside
isakmp enable outside
isakmp key xx address 11.27.19.20 netmask 255.255.255.255
isakmp identity address
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption des
isakmp policy 10 hash md5
isakmp policy 10 group 1
isakmp policy 10 lifetime 1000

console timeout 0
dhcpd address 10.168.20.17-10.168.20.21 inside
dhcpd dns 10.168.10.2
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd option 66 ascii 10.168.10.1
dhcpd option 150 ip 10.168.10.1 10.168.10.2
dhcpd enable inside

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