Схема такая LAN(192.168.20.0/24)-----PIX----WAN(172.16.1.0/32)

Как настроить NAT в данном случае?
Вот мой конфиг
PIX Version 6.3(5)
interface ethernet0 100full
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname pixfirewall
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol icmp error
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
fixup protocol tftp 69
names        
access-list acl_ping_outside permit icmp any any
access-list acl_ping permit icmp any any source-quench
access-list acl_ping permit icmp any any time-exceeded
access-list acl_ping permit icmp any any unreachable
access-list acl_ping permit icmp any any echo-reply
access-list acl_ping permit icmp any any echo
access-list acl_ping permit icmp any any
access-list 101 permit tcp any any
access-list 101 permit udp any any
access-list 101 permit ip 172.16.1.0 255.255.255.252 172.16.1.0 255.255.255.252
pager lines 24
icmp permit any outside
icmp permit any inside
mtu outside 1500
mtu inside 1500
ip address outside 172.16.1.2 255.255.255.252
ip address inside 192.168.20.54 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm history enable
arp timeout 14400
global (outside) 5 172.16.1.1 netmask 255.255.255.255
nat (inside) 5 192.168.20.0 255.255.255.0 0 0
access-group 101 in interface outside
access-group acl_ping in interface inside
conduit permit ip 172.16.1.0 255.255.255.252 172.16.1.0 255.255.255.252
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 sip-disconnect 0:02:00 sip-invite 0:03:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet 10.10.20.54 255.255.255.255 outside
telnet timeout 5
ssh timeout 5
console timeout 0
terminal width 80
Cryptochecksum:4cb403438626a85460a9e68f6539e4c6
: end