Can't access PIX 501 after switch from dsl to cable

Hi--
I have two small offices and recently switched from dsl to cable internet. the two pix501 f/w units worked fine on dsl, but for the life of me I cannot even access the units now from the inside as I was able to do before when on dsl signal. I know I need to change the configuration from PPPoe to DHCP, but I can't get access to do it.
Any suggestions?
I believe I have 6.2 software, but I'm not sure. The Inside address is 10.8.6.1 now.
thanks--jb

Jorge--
I did have the Pix connected to router, 192 168.1.1 for convenience, so I could still get internet wirelessly without having to do lots of wire unplugging and plugging.
I have since changed to topology of comcast modem connected directly to pix which in turn connects directly to laptop.
In this configuration, laptop pings 10.8.6.1 ok, but pix has no connectivity to comcast.
When laptop connected directly to comcast modem,(ie pix removed) the ipconfig /all from laptop reads the following from comcast:
ip 71.192.7.130
mask 255.255.252.0
DG 72.192.11.1
DHCP server 68 87 71 52
DNS 68 87 71 226 and 68 87 73 242
Response to pix# show route | inc 0.0.0.0 is nothing.
For reference, here is show run
pixMDC# show run
: Saved
PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password PVSASRJovmamnVkD encrypted
passwd PVSASRJovmamnVkD encrypted
hostname pixMDC
domain-name keene.com
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
access-list outside_access_in permit icmp any any echo-reply
access-list outside_access_in permit icmp any any source-quench
access-list outside_access_in permit icmp any any unreachable
access-list outside_access_in permit icmp any any time-exceeded
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside dhcp setroute
ip address inside 10.8.6.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm location 10.0.0.0 255.0.0.0 inside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 10.8.6.0 255.255.255.0 0 0
access-group outside_access_in in interface outside
timeout xlate 0:05:00
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
http server enable
http 10.0.0.0 255.0.0.0 inside
http 10.8.6.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet 10.8.6.0 255.255.255.0 inside
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 10.8.6.2-10.8.6.33 inside
dhcpd dns 151.203.0.84 151.202.0.84
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
vpnclient server 10.8.6.0 10.0.0.0
vpnclient mode client-mode
vpnclient vpngroup fnd password ********
vpnclient username fnd password ********
vpnclient enable
terminal width 80
Cryptochecksum:6ca15e834dc867c6f12b46b2bd28a4a8
: end
pixMDC#
pixMDC#
pixMDC#
pixMDC# ping 71.192.7.130
No route to host 71.192.7.130.
Usage: ping [if_name]
pixMDC#
It appears that the pix is not seeing the comcast dhcp signal and latching onto it.
Thanks,
Jeffrey

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