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Cisco PIX 501 and Linksys ADSL WAG200G Router

Posted on 2008-10-15
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Last Modified: 2012-08-13
Hi,

I understand it's possible to specify the local LAN port of my PIX on the WAG200G (under DMZ configuration)  a few questions::-

1) Will this configuration basically handover the firewalling in full to my PIX?
2) Do I need to make any "additional" configuration changes to either the PIX or ADSL router?
3) Should I  disable the firewall on the Linksys router in order for Internet traffic in full to hit my PIX?
4) Should I disable port forwarding on the Linksys router?

May thanks!
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Question by:dt3itsteam
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jtdebeer earned 250 total points
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I would suggest you setup all your security needs on the PIX as it is much more configurable.
Pass everything through the DSL router and then get your PIX to do the hard stuff.
Performance should also be better than through the DSL router.

HTH
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by:dt3itsteam
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Here's my curent (and operational) config (bar MSN blocking statements!)  on my home cable connection:-

I'm looking to run the same config behind a DSL router, hence wondered what configuration changes I would need to make to the router to facilitate the same firewall rules?  Do I need two public I.P's?  so an I.P on the router, the other on the outside interface?

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password SX/Y7cXtfgcNOcz9 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname pixfw
domain-name workgroup
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 pptp 1723
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
name 192.168.0.13 Exchange
object-group service MSN_Messenger_tcp tcp
  port-object eq www
  port-object eq 1863
  port-object eq 7001
object-group network MSN_Messenger_hosts
  network-object 65.54.195.0 255.255.255.0
  network-object 65.54.225.0 255.255.255.0
  network-object 65.54.226.0 255.255.254.0
  network-object 65.54.228.0 255.255.254.0
  network-object host 65.54.240.61
  network-object host 65.54.240.62
  network-object 207.46.104.0 255.255.252.0
  network-object 207.46.108.0 255.255.255.0
  network-object 207.68.171.0 255.255.255.0
access-list outside permit tcp any interface outside eq smtp
access-list outside permit tcp any interface outside eq https
access-list outside permit tcp any any eq ssh
access-list outside permit tcp any interface outside eq pptp
access-list inside permit tcp any any eq ftp
access-list inside permit tcp any any eq www
access-list inside permit udp any any eq domain
access-list inside permit tcp any any eq domain
access-list inside permit tcp any any eq https
access-list inside deny ip any any
access-list acl-inside deny tcp any object-group MSN_Messenger_hosts object-group MSN_Messenger_tcp
pager lines 24
icmp deny any outside
mtu outside 1500
mtu inside 1500
ip address outside dhcp setroute retry 4
ip address inside 192.168.0.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm location 192.168.16.58 255.255.255.255 outside
pdm location Exchange 255.255.255.255 inside
pdm location 192.168.0.1 255.255.255.255 outside
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) tcp interface https Exchange https netmask 255.255.255.255 0 0
static (inside,outside) tcp interface smtp Exchange smtp netmask 255.255.255.255 0 0
static (inside,outside) tcp interface ssh 192.168.0.1 ssh netmask 255.255.255.255 0 0
static (inside,outside) tcp interface pptp Exchange pptp netmask 255.255.255.255 0 0
access-group outside in interface outside
access-group inside in interface inside
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
http server enable
http 192.168.0.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet 192.168.0.0 255.255.255.0 inside
telnet timeout 15
ssh 192.168.0.1 255.255.255.255 outside
ssh timeout 15
console timeout 0
dhcpd address 192.168.0.2-192.168.0.10 inside
dhcpd dns 81.26.107.2
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd enable inside
terminal width 80
banner login Disconnect immediately if not authorised
banner login Disconnect immediately if not authorised
banner motd Home cable firewall
banner motd Home cable firewall
Cryptochecksum:f0ec7af1a913ec484cc6bfc66c25ae8a
: end
pixfw(config)#
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