topic Re: Pix 501 not passing traffic to internet in Network Security

Pix 501 not passing traffic to internet

panzj — Mon, 11 Mar 2019 14:39:47 GMT

After a power cycle our pix quit passing traffic from clients being the firewall to the internet though nothing had changed. I can ping addresses from the pix CLI, but not from any workstation. I have reset the 501 back to factory default and manually reapplied the config. I have also upgraded to 6.3(5), but no luck. Here is my config, any help would be appreciated.

PIX Version 6.3(5)

interface ethernet0 auto

interface ethernet1 100full

nameif ethernet0 outside security0

nameif ethernet1 inside security100

enable password xxx

passwd xxx

hostname pixfirewall

domain-name comtechspec.local

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 inbound permit tcp any any eq https

access-list inbound permit tcp any any eq smtp

access-list inbound permit tcp any any eq pptp

access-list inbound permit gre any any

access-list inbound permit tcp any any eq 4125

access-list inbound permit tcp any any eq 3389

pager lines 24

mtu outside 1500

mtu inside 1500

ip address outside x.x.x.x 255.255.255.252

ip address inside x.x.x.x 255.255.255.0

ip audit info action alarm

ip audit attack action alarm

pdm location x.x.x.x 255.255.255.0 inside

pdm logging informational 100

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 4125 x.x.x.x 4125 netmask 255.255.255.255 0 0

static (inside,outside) tcp interface https x.x.x.x https netmask 255.255.255.255 0 0

static (inside,outside) tcp interface pptp x.x.x.x pptp netmask 255.255.255.255 0 0

static (inside,outside) tcp interface smtp x.x.x.x smtp netmask 255.255.255.255 0 0

static (inside,outside) tcp interface 3389 x.x.x.x 3389 netmask 255.255.255.255 0 0

access-group inbound in interface outside

route outside 0.0.0.0 0.0.0.0 70.63.67.217 1

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 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 x.x.x.x 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 timeout 5

ssh 0.0.0.0 0.0.0.0 inside

ssh timeout 5

console timeout 0

dhcpd auto_config outside

terminal width 80

Cryptochecksum:xxx

: end

pixfirewall#

Re: Pix 501 not passing traffic to internet

kwillacey — Tue, 20 Jan 2009 19:41:02 GMT

Try enabling logging and see what it generates.

Re: Pix 501 not passing traffic to internet

Jon Marshall — Tue, 20 Jan 2009 19:55:58 GMT

Have you just tried ping or have you tried something else because ping will not respond as you are not allowing this in your acl on the outside interface -

access-list inbound permit tcp any any eq https

access-list inbound permit tcp any any eq smtp

access-list inbound permit tcp any any eq pptp

access-list inbound permit gre any any

access-list inbound permit tcp any any eq 4125

access-list inbound permit tcp any any eq 3389

there is no ICMP inspection on version 6.x. What happens if you try to connect to a web page ?

Jon

Re: Pix 501 not passing traffic to internet

panzj — Tue, 20 Jan 2009 20:20:44 GMT

I am not sure about ICMP inspection, but when I try and connect to the web on a client I get page cannot be displayed. I cannot get DNS resolution either from our public DNS server. It seems like every piece of traffic is not being permitted outbound.

If someone could post how to enable logging so I do not have to look it up, that would be great!

Re: Pix 501 not passing traffic to internet

Tshi M — Tue, 20 Jan 2009 20:27:06 GMT

I will enable logging and use a program like Kiwisyslog to see the live logging.

Do you have any output with sh xlate?

I will aslo remove the ACL and test it without the ACL.

Did you check your edge router if any?

Re: Pix 501 not passing traffic to internet

Tshi M — Tue, 20 Jan 2009 20:29:05 GMT

logging on

logging timestamps

logging trap info

logging host inside x.x.x.x

Re: Pix 501 not passing traffic to internet

Jon Marshall — Tue, 20 Jan 2009 20:29:33 GMT

First try just connecting to an IP address from your browser -

http://198.133.219.25 <-- this is Cisco's web site

Then if still no joy you could try debugging packets but be aware this could place a heavy load on the pix. But by the sounds of it it isn't working correctly anyway at the moment.

debug packet inside dst 198.133.219.25

debug packet outside dst 198.133.219.25

then try to connect. You should see packets hitting the inside interface of the pix with a src IP address of the client and a destination of 198.133.219.25.

You should also then see packets leaving the outside interface with a src IP of the pix outside interface and the destination of 198.133.219.25.

Let me know how you get on. To turn off debugging

no debug all

sh debug <-- if there is still debugging on repeat with

no debug all

Jon

Re: Pix 501 not passing traffic to internet

panzj — Fri, 23 Jan 2009 03:22:39 GMT

Guys

Appreciate all your help. I tried debug (which I could not interpret) and logging, but it would not log any information concern http traffic. What I did figure out was that I could hit a site via IP, but not name. So I removed and re-added the fixup protocol DNS. I think that is what ultimately did it. I also added some access-lists to the inside interface, but I ended up removing them.

Thanks again.