PIX firewall

Posted on 2006-07-12
Last Modified: 2013-11-16

I am stuck up with below pix config .not able to ping or browse the public which i have natted to inside zone ip. seems like both icmp and http requests are being recived at PIx end when checked up the access-list .Kindly look at the below configs and help me to resolve the issue. thanks

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password DS1yhSk68ojtXT2A encrypted
passwd 93cuN9bZRhoPmf6Z encrypted
hostname ciscopix
domain-name sss
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
access-list outside_access_in permit tcp any host 210.212.*..8 eq www
access-list outside_access_in permit icmp any host 210.212.*.8

pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside 210.212.*.7
ip address inside
ip audit info action alarm
ip audit attack action alarm
pdm location inside
pdm location inside
pdm location inside
pdm location inside
pdm location inside
pdm location 210.212.*.* outside
pdm location 210.212.*.* outside
pdm location 210.212.*.* outside
pdm logging informational 100
pdm history enable
arp timeout 14400
nat (inside) 0 0 0
static (inside,outside) 210.212.*.* netmask 0 0
access-group outside_access_in in interface outside
rip inside passive version 1
rip inside default version 1
route outside 210.212.*.*  1
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 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet 210.212.*.* outside
telnet 210.212.*.* outside
telnet inside
telnet inside
telnet timeout 10
ssh 210.212.*.* outside
ssh 210.212.*.* outside
ssh timeout 5
console timeout 0
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
username babu password qcNlihb8awfR9nvm encrypted privilege 2
username dileep password 5IdlDfF/QhqmnsGH encrypted privilege 15
ciscopix# sh run
: Saved

ciscopix# sh access-list
access-list cached ACL log flows: total 0, denied 0 (deny-flow-max 1024)
            alert-interval 300
access-list outside_access_in; 3 elements
access-list outside_access_in line 1 permit tcp any host 210.212.*.*  eq www (hitcnt=28)
access-list outside_access_in line 2 permit icmp any host 210.212.*.*  (hitcnt=91)

Question by:ssshibu
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LVL 32

Expert Comment

ID: 17090724
Do this;

no nat (inside) 0 0 0

nat (inside) 1
global (outside) 1 interface

Save the config and then try accessing internet from inside.


Author Comment

ID: 17090846


 i did the change as u suggested but still i am not able to ping from internet to my natted (public iP). i am able to reach the pIX outside ip.

Pl check

LVL 32

Accepted Solution

rsivanandan earned 75 total points
ID: 17090930
Do a clear xlate on the pix and then try to

telnet 210.212.*.8 80

Let me know what is that you see.

What is the default gateway set on the machine? Does it point to PIX ?

The earlier comment I gave was for your internal clients to get outside.


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Author Comment

ID: 17091148
1.C:\Documents and Settings\admin>telnet 210.212.*.*  80
Connecting To 210.212.*.*...Could not open connection to the host, on port 80
: Connect failed

2. What is the default gateway set on the machine? Does it point to PIX ? - this i need to check as i am sitting away from that office..will let u know

3. The earlier comment I gave was for your internal clients to get outside - cant we accomplish the outside connectivity with nat (inside) 0 command,  what does actually this command do ?
in this case  i dont want people to get outside from inside. but that should get accessed from outside with 210.212.*.8

thanks for your quick reply
LVL 32

Expert Comment

ID: 17092049
For the testing purpose, just do;

icmp allow any any

Then first try to see if you can ping the outside ip address of PIX.

If yes, then try to ping that webserver address (Public ip)

2. You need to check to see if the default gateway is pointing to pix, otherwise the communication may be reaching the device but it may not be coming back, thus fails.

3. nat 0 command disables all the natting, so if you don't want your inside clients to get out even then do this

no nat (inside) 0


Author Comment

ID: 17113125

Sorry for the late written reply

Exactly as u pointed out the default gateway was wrong . Thanks a lot...!!!

Pl clarrify below doubts

1.  Suppose at later stage if i want to allow a specific inside ip to go to internet how do i do the natting ? is it possible to allow a single ip alone?

2. 3. nat 0 command disables all the natting, so if you don't want your inside clients to get out even then do this

no nat (inside) 0 -  should i remove the Global command aslo along with this?  if i remove this can inside IPs ping outside IPs?

3. nat (inside) 0 - instead of this command can we put statement for individual network?

Thanks again

LVL 32

Expert Comment

ID: 17113139
Glad you got it working.

1. Yes it is possible;

global (outside) 1 interface
nat (inside) 1

The above statements allow the client machine to go out to internet using PAT of outside interface ip address of PIX.

2. Global and nat commands are required for inside to outside nat. (Basically nat command defines *what* to nat and global command defined *towhat* )

3. Same as question 1.

nat (inside) 1

The above statement will make sure that all the machines in the subnet will be able to go out....


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