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WEB ACCESS FROM DMZ THROUGH PIX FIREWALL

Posted on 2006-10-30
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Last Modified: 2013-11-16
I have a strange problem in that i have 3 servers sat on the DMZ which can all access the web ok. I have added another, but although this can ping the local network and can be accessed externally i can not get the server to access the web.

The pix is connected to a linkproof loadbalancer, but there are not access rules set on this unit.

I can see in the log of the loadbalancer that the ip address of the server is getting through to it, but does not make it as far as the router. or so it seems.

The server is added to the pix as a host and all rules are host based, so i shouldnt need to add any extra rules to the access list.

If i take down one of the servers and use this ip addres on the new server it works fine.

I can only assume that there is a problem with the firewall in that it is not letting something through somewhere.


access-list dmz_access_in permit ip host HOST1-1 255.255.255.0
access-list dmz_access_in permit ip host HOST2-1 255.255.255.0
access-list dmz_access_in permit ip host HOST3-1 255.255.255.0
access-list dmz_access_in permit ip host HOST4-1 255.255.255.0
access-list dmz_access_in permit tcp host HOST1 any eq smtp
access-list dmz_access_in permit ip any any
access-list dmz_access_in permit tcp any any












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Question by:WMfxms
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8 Comments
 
LVL 27

Expert Comment

by:pseudocyber
ID: 17833122
Do you have firewall rules disallowing access out?  This is the way we do it - and think it's a good design.  Since you said all the rules are host based, if you did it this way, you'd have to add an outbound rule as well.  To get around such minute administration, we recognize the DMZ net as trusted and have a rule which allows port 80 outbound from the DMZ net, instead of each individual server.

HTH
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LVL 79

Expert Comment

by:lrmoore
ID: 17833131
Do you have static xlates for these servers? You probably need another static for this new server
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Author Comment

by:WMfxms
ID: 17840936
I am awaiting feedback from Radware on the load balancer as the firewall seems to be configured ok. I am getting an entry on the loadbalancer, so i know the request is going through the firewall ok. It just doesnt make it to the router....

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LVL 27

Expert Comment

by:pseudocyber
ID: 17841256
(As an aside, we used to have Radware Linkproof LB's.  Tons of problems.  Yanked them out and replaced with two beefy Cisco routers running BGP to two different ISP's who we peer with.  No problems since then.  All our Radware has gone away - Linkproofs, WSD's, Fireproofs).
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Author Comment

by:WMfxms
ID: 17989379
Sorted - was a problem with linkproof
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LVL 27

Expert Comment

by:pseudocyber
ID: 17989951
Go figure.  :|  Glad you got it working.
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