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Two problems with installation of ISA server in Cache Mode.

Posted on 2003-11-10
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Last Modified: 2013-11-16
We've installed ISA server in cache mode on a windows 2000 server.  We are running dual intel nic's in load balancing mode.  The server was just installed on Saturday.  

1.) This morning we come in to find that there are a bunch of static routes added to the routing table.  The IP addresses are from different sites (yahoo.com, hotmail.com, etc).  The default route on the ISA server is our primary router at corporate.  This router then directs all internet traffic to our Checkpoint firewall.  The new routes in the ISA server point to the internal NIC of our Checkpoint firewall (as opposed to the default route of the corporate router).  If I set the default route as the internal nic of the checkpoint firewall, nothing gets out.  Why is the servers routing table being populated with routes to the checkpoint firewall as opposed to using the default route.

2.)  We have the the access policy in ISA set to allow "All IP Traffic" out to any destination.  We use our checkpoint firewall and websense to block and monitor specific traffic.  When people try to stream certain internet radio stations, they get an error.  The website that is posting the error is http://www.midi1.com  The Technical Information on the page says the following:

-Background:
    This error indicates that the gateway could not find the IP address of the website you are trying to access
-ISA Server: NETPROXY.xyz.com
  Via:
   Time: 11/10/2003 3:19:27 PM GMT

This error occurred at 10:19 AM EST.  I've checked the time on our ISA server and it appears to be accurate.  I know that some routing is time sensitive and I wonder if this could be the problem.  Does our checkpoint firewall, ISA server, and Corporate Router all need to be on the same time (precisely...they are currently all within a minute or so of eachother)?  Or is this a routing issue?  Thanks for your help.  This is the most valuable site I've found for this kind of info.

Steve
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Question by:slaroche
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Expert Comment

by:chicagoan
ID: 9715561
Can you post the output of ROUTE PRINT and IP CONFIG?
(edit any sensitive information b4 posting)
0
 

Author Comment

by:slaroche
ID: 9715626
Route Print:

U:\>route print
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 00 00 00 ea ...... Intel (R) Advanced Networking Services (iANS) ND
IS Intermediate Driver (Microsoft's Packet Scheduler)
===========================================================================
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0     192.168.85.1   192.168.85.19       1
          0.0.0.0          0.0.0.0    192.168.85.12   192.168.85.19       1
       10.1.101.0    255.255.255.0     192.168.85.1   192.168.85.19       1
       10.1.104.0    255.255.255.0     192.168.85.1   192.168.85.19       1
       10.1.105.0    255.255.255.0     192.168.85.1   192.168.85.19       1
       10.1.106.0    255.255.255.0     192.168.85.1   192.168.85.19       1
       10.1.108.0    255.255.255.0     192.168.85.1   192.168.85.19       1
       10.1.110.0    255.255.255.0     192.168.85.1   192.168.85.19       1
       10.1.124.0    255.255.255.0     192.168.85.1   192.168.85.19       1
       10.1.150.0    255.255.255.0     192.168.85.1   192.168.85.19       1
       10.1.153.0    255.255.255.0     192.168.85.1   192.168.85.19       1
      12.106.67.4  255.255.255.255    192.168.85.12   192.168.85.19       1
      38.15.67.68  255.255.255.255    192.168.85.12   192.168.85.19       1
     38.144.72.17  255.255.255.255    192.168.85.12   192.168.85.19       1
     38.144.72.18  255.255.255.255    192.168.85.12   192.168.85.19       1
     38.144.72.19  255.255.255.255    192.168.85.12   192.168.85.19       1
     38.144.72.20  255.255.255.255    192.168.85.12   192.168.85.19       1
   63.150.154.197  255.255.255.255    192.168.85.12   192.168.85.19       1
     63.214.53.25  255.255.255.255    192.168.85.12   192.168.85.19       1
     63.214.53.33  255.255.255.255    192.168.85.12   192.168.85.19       1
    63.240.15.160  255.255.255.255    192.168.85.12   192.168.85.19       1
      64.12.39.57  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.12.54.249  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.12.137.56  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.148.241  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.151.141  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.151.176  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.160.185  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.174.121  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.174.185  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.174.249  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.180.148  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.184.141  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.12.188.121  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.14.143.201  255.255.255.255    192.168.85.12   192.168.85.19       1
      64.70.10.80  255.255.255.255    192.168.85.12   192.168.85.19       1
      64.70.54.50  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.124.29.68  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.124.45.219  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.147.130.56  255.255.255.255    192.168.85.12   192.168.85.19       1
   64.147.131.135  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.152.73.143  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.152.73.147  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.152.73.207  255.255.255.255    192.168.85.12   192.168.85.19       1
   64.158.223.128  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.202.108.1  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.236.16.84  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.236.16.136  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.236.16.137  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.236.16.138  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.236.16.242  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.236.24.138  255.255.255.255    192.168.85.12   192.168.85.19       1
    64.236.24.139  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.236.40.32  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.236.40.38  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.236.40.64  255.255.255.255    192.168.85.12   192.168.85.19       1
     64.236.40.70  255.255.255.255    192.168.85.12   192.168.85.19       1
    65.54.192.248  255.255.255.255    192.168.85.12   192.168.85.19       1
    65.54.208.222  255.255.255.255    192.168.85.12   192.168.85.19       1
       65.126.5.4  255.255.255.255    192.168.85.12   192.168.85.19       1
   65.242.124.135  255.255.255.255    192.168.85.12   192.168.85.19       1
   65.242.124.145  255.255.255.255    192.168.85.12   192.168.85.19       1
    66.28.222.103  255.255.255.255    192.168.85.12   192.168.85.19       1
    66.35.229.142  255.255.255.255    192.168.85.12   192.168.85.19       1
    66.35.229.178  255.255.255.255    192.168.85.12   192.168.85.19       1
    66.35.229.213  255.255.255.255    192.168.85.12   192.168.85.19       1
    66.35.229.239  255.255.255.255    192.168.85.12   192.168.85.19       1
   66.163.171.166  255.255.255.255    192.168.85.12   192.168.85.19       1
    66.218.71.109  255.255.255.255    192.168.85.12   192.168.85.19       1
    66.232.154.29  255.255.255.255    192.168.85.12   192.168.85.19       1
   68.162.250.224  255.255.255.255    192.168.85.12   192.168.85.19       1
        127.0.0.0        255.0.0.0        127.0.0.1       127.0.0.1       1
   128.121.26.136  255.255.255.255    192.168.85.12   192.168.85.19       1
   149.174.130.88  255.255.255.255    192.168.85.12   192.168.85.19       1
  149.174.130.216  255.255.255.255    192.168.85.12   192.168.85.19       1
   151.193.204.16  255.255.255.255    192.168.85.12   192.168.85.19       1
  152.163.208.121  255.255.255.255    192.168.85.12   192.168.85.19       1
  152.163.208.249  255.255.255.255    192.168.85.12   192.168.85.19       1
    159.53.216.46  255.255.255.255    192.168.85.12   192.168.85.19       1
   164.109.92.167  255.255.255.255    192.168.85.12   192.168.85.19       1
   166.90.148.215  255.255.255.255    192.168.85.12   192.168.85.19       1
   166.90.148.232  255.255.255.255    192.168.85.12   192.168.85.19       1
  168.143.178.161  255.255.255.255    192.168.85.12   192.168.85.19       1
     192.168.85.0    255.255.255.0    192.168.85.19   192.168.85.19       1
    192.168.85.19  255.255.255.255        127.0.0.1       127.0.0.1       1
   192.168.85.255  255.255.255.255    192.168.85.19   192.168.85.19       1
  204.245.113.244  255.255.255.255    192.168.85.12   192.168.85.19       1
   205.180.85.140  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.139.152  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.145.184  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.145.185  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.145.214  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.145.217  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.165.185  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.165.249  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.220.181  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.238.110  255.255.255.255    192.168.85.12   192.168.85.19       1
  205.188.247.121  255.255.255.255    192.168.85.12   192.168.85.19       1
    206.24.190.94  255.255.255.255    192.168.85.12   192.168.85.19       1
  206.151.167.254  255.255.255.255    192.168.85.12   192.168.85.19       1
   206.157.193.68  255.255.255.255    192.168.85.12   192.168.85.19       1
   206.157.193.71  255.255.255.255    192.168.85.12   192.168.85.19       1
   207.46.196.108  255.255.255.255    192.168.85.12   192.168.85.19       1
   207.46.196.120  255.255.255.255    192.168.85.12   192.168.85.19       1
   207.68.171.232  255.255.255.255    192.168.85.12   192.168.85.19       1
   207.68.171.244  255.255.255.255    192.168.85.12   192.168.85.19       1
   207.68.176.190  255.255.255.255    192.168.85.12   192.168.85.19       1
    207.68.177.59  255.255.255.255    192.168.85.12   192.168.85.19       1
    207.68.177.62  255.255.255.255    192.168.85.12   192.168.85.19       1
    207.188.7.117  255.255.255.255    192.168.85.12   192.168.85.19       1
    207.188.7.175  255.255.255.255    192.168.85.12   192.168.85.19       1
    208.185.54.52  255.255.255.255    192.168.85.12   192.168.85.19       1
      208.254.0.7  255.255.255.255    192.168.85.12   192.168.85.19       1
      208.254.0.8  255.255.255.255    192.168.85.12   192.168.85.19       1
     208.254.0.15  255.255.255.255    192.168.85.12   192.168.85.19       1
     208.254.0.38  255.255.255.255    192.168.85.12   192.168.85.19       1
     208.254.0.89  255.255.255.255    192.168.85.12   192.168.85.19       1
    208.254.63.58  255.255.255.255    192.168.85.12   192.168.85.19       1
    208.254.63.60  255.255.255.255    192.168.85.12   192.168.85.19       1
     209.51.177.7  255.255.255.255    192.168.85.12   192.168.85.19       1
     209.51.177.8  255.255.255.255    192.168.85.12   192.168.85.19       1
     209.51.177.9  255.255.255.255    192.168.85.12   192.168.85.19       1
    209.51.177.17  255.255.255.255    192.168.85.12   192.168.85.19       1
    209.51.177.24  255.255.255.255    192.168.85.12   192.168.85.19       1
    209.51.177.32  255.255.255.255    192.168.85.12   192.168.85.19       1
      209.225.0.6  255.255.255.255    192.168.85.12   192.168.85.19       1
  209.246.122.148  255.255.255.255    192.168.85.12   192.168.85.19       1
  209.246.122.149  255.255.255.255    192.168.85.12   192.168.85.19       1
     216.73.87.13  255.255.255.255    192.168.85.12   192.168.85.19       1
     216.73.87.82  255.255.255.255    192.168.85.12   192.168.85.19       1
    216.74.132.12  255.255.255.255    192.168.85.12   192.168.85.19       1
    216.87.85.105  255.255.255.255    192.168.85.12   192.168.85.19       1
   216.109.118.67  255.255.255.255    192.168.85.12   192.168.85.19       1
   216.109.118.77  255.255.255.255    192.168.85.12   192.168.85.19       1
   216.109.127.16  255.255.255.255    192.168.85.12   192.168.85.19       1
   216.109.127.17  255.255.255.255    192.168.85.12   192.168.85.19       1
   216.109.127.60  255.255.255.255    192.168.85.12   192.168.85.19       1
   216.120.60.144  255.255.255.255    192.168.85.12   192.168.85.19       1
   216.136.174.87  255.255.255.255    192.168.85.12   192.168.85.19       1
    216.203.32.78  255.255.255.255    192.168.85.12   192.168.85.19       1
    216.239.37.99  255.255.255.255    192.168.85.12   192.168.85.19       1
  216.242.235.108  255.255.255.255    192.168.85.12   192.168.85.19       1
        224.0.0.0        224.0.0.0    192.168.85.19   192.168.85.19       1
  255.255.255.255  255.255.255.255    192.168.85.19   192.168.85.19       1
Default Gateway:      192.168.85.1
===========================================================================
Persistent Routes:
  Network Address          Netmask  Gateway Address  Metric
       10.1.101.0    255.255.255.0     192.168.85.1       1
       10.1.104.0    255.255.255.0     192.168.85.1       1
       10.1.105.0    255.255.255.0     192.168.85.1       1
       10.1.106.0    255.255.255.0     192.168.85.1       1
       10.1.108.0    255.255.255.0     192.168.85.1       1
       10.1.110.0    255.255.255.0     192.168.85.1       1
       10.1.124.0    255.255.255.0     192.168.85.1       1
       10.1.150.0    255.255.255.0     192.168.85.1       1
       10.1.153.0    255.255.255.0     192.168.85.1       1

U:\>

192.168.85.19 = ISA Server IP
192.168.85.12 = Checkpoint Internal NIC
192.168.85.1   = Corporate Router

IPConfig

U:\>ipconfig /all

Windows 2000 IP Configuration

        Host Name . . . . . . . . . . . . : ISA
        Primary DNS Suffix  . . . . . . . : xyz.com
        Node Type . . . . . . . . . . . . : Mixed
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : xyz.com

Ethernet adapter Local Area Connection 3:

        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : Intel(R) Advanced Network Services V
irtual Adapter
        Physical Address. . . . . . . . . : 00-00-00-xy-z0 (changed for security)
        DHCP Enabled. . . . . . . . . . . : No
        IP Address. . . . . . . . . . . . : 192.168.85.19 (Load Balanced NIC's)
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.85.1 (Corporate Router)
        DNS Servers . . . . . . . . . . . : Internal and External

I hope this helps.
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LVL 18

Expert Comment

by:chicagoan
ID: 9715762

       You have two default routes,          

0.0.0.0          0.0.0.0     192.168.85.1   192.168.85.19       1
0.0.0.0          0.0.0.0    192.168.85.12   192.168.85.19       1

Any idea how the 192.168.85.12 gateway address got there?
You have persistent routes for your 10.x.x.x network (why?) so I assume you have run a ROUTE /P command at some point or there's one in the startup.

With two gateways of last resort if a site is temporarily unreachable the second will be tried and that route will persist.



0
 

Author Comment

by:slaroche
ID: 9715838
The gateway 192.168.85.12 was added this morning in an effort to prevent more static routes from being added into the routing table.  This was done because so many static routes had been added pointing to that address.  I could take it out and it would make no difference in accessability.  

10.x.x.x are our remote sites.  I added them in with a -p, but they too are not neccessary.  I could remove them, and traffic would flow fine.  These are just my attempts to straighten out the ISA server's routing issues.  

I guess the question is..why would the static route be added for the 192.168.85.12 address, when it can get there just as easily going through 192.168.85.1 (default gateway)?
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LVL 18

Expert Comment

by:chicagoan
ID: 9715971
As this machine is not using DHCP, there should be no router discovery by default - unless the ISA server's Web Proxy Auto Discovery Protocol is doing this, see if that's enabled.

As far as router discovery in the Operating System
check the following key in the registry:
HKEY_LOCAL_Machine\System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<interface_name for your ehternet interface (#3)>

Check for the following registry value:
Value Name: PerformRouterDiscovery
Data Type:REG_DWORD
Valid Range: 0,1
Default: 0
Description: This parameter controls whether Windows 2000 will attempt to perform router discovery per RFC 1256 on a per-interface basis. This parameter defaults to 0 or FALSE.
The persistent router to 10.x.x.x are superfluous if there is only one default gateway and no RDP

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Author Comment

by:slaroche
ID: 9716111
WPAD is enabled on port 80.  We have a device listed in our DHCP server for this ISA server.

I could not find performrouterdiscovery in the registry at the location you indicated.  I also ran a search for it, and found nothing.  The Value: UseZeroBroadcast is set to 0.   That was the closest thing I could find to what you are referring to.

I agree that we do not need the 10.x.x.x routes.  I only added them as a precautionary measure.
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LVL 18

Expert Comment

by:chicagoan
ID: 9716294

> We have a device listed in our DHCP server for this ISA server.
I assume this is to exclude this address from you DCHP pool and document it, as the machine is not actually using DHCP this should not be the issue.

>WPAD is enabled on port 80.
I'm not sure what effect disabling this will have on your setup, I'd hate to set off some domino effect on downstream settings.
gee... I can't connect to http://www.midi1.com/ - it has a dns entry of 195.115.154.230 but dies at ASN 8228
If WPAD incorporates router discovery ( I haven't verified that) and request went out to contact something temporarily unreachable, the discovered route would be attempted and end up in your routing table.

If you want all your outbound traffic from the ISA server to go directly through the router, you can strongarm ir by disallowing traffic from .19 on the checkpoint.

>The new routes in the ISA server point to the internal NIC of our Checkpoint firewall (as opposed to the default route of the corporate router).  
So you're trying to use the ISA server as an outbound proxy without going through the checkpoint... meaning you have a backdoor unfettered route to your border router?

I can see the idea of using the ISA server vs the checkpoint as it might be easier to configure for certain things or have some different capabilities but I'd be interested in seeing how you set that up to eliminate bypass traffic and source routing scams.
0
 

Author Comment

by:slaroche
ID: 9716678
>I assume this is to exclude this address from you DCHP pool and document it, as the machine is not actually using DHCP this should not be the issue.
Under server options in DHCP, we have option 252 WPAD selected and we have the ISA server as the value.

>If WPAD incorporates router discovery ( I haven't verified that) and request went out to contact something temporarily unreachable, the discovered route would be attempted and end up in your routing table.
I'm pretty sure WPAD does not incorporate router discovery.  It is a default setting used to broadcast it's availability to client computers set to automatically detect proxy settings.


>So you're trying to use the ISA server as an outbound proxy without going through the checkpoint... meaning you have a backdoor unfettered route to your border router?
Sort of.  We are using it as a filter and a web caching server.  It is not directly connected to the internet, nor is the corporate router.  The corporate router has all of the WAN connections and all of the necessary routes to move IP traffic.  The routers gateway of last resort is the Checkpoint intnernal NIC.  So all internet traffic does pass through the checkpoint firewall.  I'm wondering why these new routes are bypassing the default route which is our corporate router and just going right out to the firewall.  It's like the server is using OSPF to bypass the router for the shorter route to the firewall.  Weird.

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LVL 18

Expert Comment

by:chicagoan
ID: 9716866
so you have:

to corporate lan     <-----------------------------><router><-------><firewall><----->to internet
                            ^-----><ISA Server><----^    

?
I don't see how the inside interface of the router and the inside interface of the firewall can be on the same subnet.    
0
 

Author Comment

by:slaroche
ID: 9717183
Here's my best explanation without creating seriously intricate .txt drawing.

Corporate Router = 192.168.85.1
        - Default Gateway for all nodes.
        - Gateway of Last resort is 192.168.85.12 (Checkpoint Internal NIC)
        - Static Routes in place for all Remote Sites
Checkpoint Firewall = 2 NICs
        -Internal: 192.168.85.12 (same subnet at Corp. Router Ethernet Interface)
        -External: 65.xxx.22.xxx - Valid Internet IP (Points to T1 Router connected to internet)
        -Also has static routes in place for all remote sites - (routes remote traffic through 192.168.85.1)
        -All dhcp clients are explicitly denied access to the internet (forces client to use proxy server)
ISA Server = 192.168.85.19 - Default Gateway is 192.168.85.1
Client machines = DHCP Clients
        -Proxy settings are built into login scripts.  Proxy is enabled in Browser.
        -All IP web traffic is directed to ISA server.

Maybe I should give more points for this one.  Thought it was just some setting we had incorrect.  Maybe it's more complicated that I had originally anticipated.  Thanks for helping with this one.
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LVL 18

Expert Comment

by:chicagoan
ID: 9717275
You only give one IP for your "corporate router".
Are you doing bankshot routing off of one interface?
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Author Comment

by:slaroche
ID: 9717336
Bankshot routing?  I'm not clear on that term.  This is a WAN router.  It has no connectivity with the public internet.  It uses a Privately Routed VPN Architecture through a large Comm company.  That's how it communicates with the remote sites.  The E0/0 interface is just 192.168.85.1/24.  
0
 

Author Comment

by:slaroche
ID: 9731812
I'm going to post this response as a new issue, but we've noticed that some of our servers and XP/2000 machines are haveing their routing tables populated by extraneous ip addresses.  The interesting thing about this is that it's only the machines that are not going through ISA server.  These machines are being routed directly through the Checkpoint Firewall.
0
 
LVL 18

Expert Comment

by:chicagoan
ID: 9732066
If both the firewall and the router have interfaces on the same subnet, you have two routes, one of which circumvents your firewall. If any sort of router discovery protocol is running it will be discovered. If anyone with a litle knowledge can set their default gateway to avoid the firewall. As the source address is not the NAT address of the firewall, the traffic can come right back to them and you esentially have no firewall. This would also allow a port scan of the inside network.

If you want all your traffic to go through the firewall, the usual thing would be to make it's inside interface the default gateway on the lan and use a different subnet on it's outside interface and the router's inside interface.

LAN<192.168.85.0>---<192.168.85.1 FIREWALL 192.168.86.1>---<192.168.86.2  ROUTER  (wan addresses)>

Sometimes you run into situations that your firewall can't handle (or the firewall administrator can't figure out) and create a 'back door' route around the firewall, but that circuit should be carefully controlled with access lists to prevent unwanted traffic.

 
0
 

Author Comment

by:slaroche
ID: 9732144
We've got two routers and one checkpoint firewall:

LAN: <192.168.85.0>---<192.168.85.1 Corp Router>---<192.168.85.22 FIREWALL 68.50.xxx.x2>---<68.50.xxx.x1 Internet Router>

The corp router also handles all of our Private WAN traffic to our remote sites over Frame-Relay.
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Accepted Solution

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chicagoan earned 250 total points
ID: 9740275
I see that you posted this question again and got an answer... glad you got it worked out.
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