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PIX and ADSL Modem

I am trying to get a PIX working with an ADSL modem. It seems that the modem has a fixed IP of and is configured with a dhcp client using http on this address. Having been configured with the ISP etc the modem then 'remembers' the MAC address of the client and then using dhcp renews the clients IP address with the ISP allocated (fixed in this case) IP address with a default gateway of one greater.

I have never been able to get the pix to get an IP address from the modem. So I have developed 2 configs with fixed IP addresses, one for configuration one for operation. This mostly seems to work except that I cannot ping the modem on from the PIX itself, whilst I can ping it from a PIX client on the secure side of the PIX. I can't understand this I hope someone might be able to help. I enclose a (anonimised) version of my (operational) config for info.

Building configuration...

: Saved


PIX Version 6.2(2)

nameif ethernet0 outside security0

nameif ethernet1 inside security100

enable password ********* encrypted

passwd ********* encrypted

hostname MyFW

domain-name mydomain

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


name MyServer

name x.x.x.x+1 ADSLMODEM

access-list outside_access_in permit tcp any any eq smtp

access-list outside_access_in permit icmp any any unreachable

access-list outside_access_in permit icmp any any time-exceeded

access-list outside_access_in permit icmp any any echo-reply

pager lines 24

logging on

logging timestamp

logging trap warnings

logging host inside MyServer

interface ethernet0 10baset

interface ethernet1 10full

icmp permit any inside

mtu outside 1500

mtu inside 1500

ip address outside x.x.x.x

ip address inside

ip verify reverse-path interface inside

ip audit info action alarm

ip audit attack action alarm

pdm location inside

pdm location inside

pdm location outside

pdm location myserver inside

pdm location ADSLMODEM outside

pdm location outside

pdm location outside

pdm logging informational 100

pdm history enable

arp timeout 14400

global (outside) 1 interface

nat (inside) 1 0 0

static (inside,outside) interface MyServer netmask 0 0

access-group outside_access_in in interface outside

route outside ADSLMODEM 1

timeout xlate 0:05:00

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

http server enable

http inside

no snmp-server location

no snmp-server contact

snmp-server community public

snmp-server enable traps

tftp-server inside myserver /

floodguard enable

no sysopt route dnat

telnet MyServer inside

telnet timeout 5

ssh timeout 5

dhcpd lease 3600

dhcpd ping_timeout 750

dhcpd auto_config outside

terminal width 80


: end



Re: PIX and ADSL Modem

Hello Alan,

Please read the following document, For your case, the SOHO section:

Hope this helps and let me know how you get on.

Thanks - Jay.

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