pix 501 configuration with charter communications

I have a problem with my pix configuration with charter internet.

i am able to grab an IP from charter for my outside interface and also able to ping IPs on the internet. my desktop is able to get an IP from the PIX for i have my dhcp server setup on the pix but the desktop is not able to get out to the internet. i think it's something to do with my global outside configuration. I'm only able to get one IP from charter and that's used by the outside interface. my configuration is pasted below. please help.

PIX Version 6.2(2)
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password N7FecZuSHJlVZC2P encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname SenPIX
fixup protocol ftp 21
fixup protocol http 80
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol ils 389
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol sip 5060
fixup protocol skinny 2000
names
access-list 100 permit icmp any any echo
access-list 100 permit icmp any any time-exceeded
access-list 100 permit icmp any any unreachable
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside dhcp
ip address inside 10.1.1.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm history enable
arp timeout 14400
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
access-group 100 in interface outside
route outside 0.0.0.0 0.0.0.0 66.214.172.1 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h323 0:05:00 si
p 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
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
no sysopt route dnat
telnet timeout 5
ssh timeout 5
dhcpd address 10.1.1.100-10.1.1.110 inside
dhcpd dns 24.205.1.14 66.215.64.14
dhcpd lease 28800
dhcpd ping_timeout 750
dhcpd enable inside
terminal width 80
Cryptochecksum:64e4deb26919025ff00a2a9531610b81
: end

seanlee