Question : Cant access internet through Cisco PIX 515


Our old Cisco PIX501 died in a storm so we have to replace it with a Cisco PIX515.   We only need it to grant internet access through a Cable modem.   I have configured the internal interface with an IP of 10.4.0.1and the external interface with 173.12.157.177.  I was told my our ISP that my next hop should be 173.12.157.178, so I added a default route of 0.0.0.0 0.0.0.0 173.12.157.178.  I can ping th internal interface from my LAN, but I can not access the internet.   I've tested internet access by plugging a PC in directly to the modem and confirmed connectivity.  But, I can not access it from inside my network.  I'm sure its something i've missed, but I just cant find it.  

Thanks!   
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Building configuration...
: Saved
:
PIX Version 6.3(4)
interface ethernet0 auto
interface ethernet1 auto
interface ethernet2 auto shutdown
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 intf2 security4
enable password /wF7.MbkEW3uZlGq encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname Lambert
domain-name JLC
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 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
pager lines 24
mtu outside 1500
mtu inside 1500
mtu intf2 1500
ip address outside 173.12.157.177 255.255.255.252
ip address inside 10.4.0.1 255.255.255.0
no ip address intf2
ip audit info action alarm
ip audit attack action alarm
pdm history enable
arp timeout 14400
route outside 0.0.0.0 0.0.0.0 173.12.157.178 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 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
http server enable
http 10.4.0.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet 10.4.0.0 255.255.255.0 inside
telnet timeout 5
ssh timeout 5
console timeout 0
terminal width 80
Cryptochecksum:9f47b75787203dfd8bf00aa9fe74e040
: end
[OK]

Answer : Cant access internet through Cisco PIX 515

You just need to enable NAT

global (outside) 10 interface
nat (inside) 10 0 0

conduit permit icmp any any
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