Multiple External IPs to Multiple Firewalls

cancel
Showing results for 
Search instead for 
Did you mean: 

Multiple External IPs to Multiple Firewalls

L0 Member

I am sure this is going to be something simple, but I am admittedly stumped (not hard to do).

 

I have a block of External IP addresses assigned by our ISP , say   172.10.10.10/29

 

The gateway is 172.10.10.10 . This contains a single physical port . This is connected to a switch to allow distribution of multiple ports. 

 

I have 2 firewalls attached.  

 

Firewall one is assigned 172.10.10.11/29  

Firewall two is assigned 172.10.10.15/29   . 

 

If I add my new PA 850 with an external interface setting of 172.10.10.14/29, it blocks access to 172.10.10.15.  The other firewall on 172.10.10.11 is not affected. 

I have created no static routes or NAT on the 850 at this point.  

If I set the external address of the 850 to 172.10.10.14/32. it still blocks 15.  

If I swap the IP addresses, that is, set the 850 to 172.10.10.15/29 and set Firewall2 to 172.10.10.14/29, it works.  So then all 3 firewalls are up. 

 

I could leave it at that. However a) I don't know why its blocking devices further down the IP address list and I would like to and b)  I have some public webservices pointing to the original IP address of 172.10.10.15 so would rather not change that.

 

 

 

 

 

1 REPLY 1

Cyber Elite
Cyber Elite

Hello,

What do the logs on the PAN say as to why the traffic is getting blocked? Might want to put in a policy of something like this for the PAN:

source zone untrust source ip 172.10.10.10/29 destination zone untrust destination ip 172.10.10.10/29 any application/any service action is allow

 

Just a thought.

Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!