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10.06.2008 at 01:25PM PDT, ID: 23791828
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9.2

cannot route back from DMZ.

Asked by bigsquish in MS Forefront-ISA

Tags: , ,

Hello there,

I'm having a problem with one of my servers in the DMZ.  It has 4 nics assigned.

Nic 1 - Internal - ip 10.1.1.26 - no GW assigned
Nic 2 - DMZ - 192.168.10.10 - no GW assigned
Nic 3 - DMZ - 192.168.10.20 - no GW assigned
NIC 4 - DMZ 192.168.10.30 - GW assigned 192.168.10.1

I have static routes added as follows at the bottom of the routing table.
-----------------------------
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0     192.168.10.1    192.168.10.30     10
         10.1.1.0    255.255.255.0        10.1.1.26        10.1.1.26     20
        10.1.1.26  255.255.255.255        127.0.0.1        127.0.0.1     20
         10.1.2.0    255.255.255.0         10.1.1.1        10.1.1.26      1
         10.1.4.0    255.255.255.0         10.1.1.1        10.1.1.26      1
   10.255.255.255  255.255.255.255        10.1.1.26        10.1.1.26     20
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1      1
     192.168.10.0    255.255.255.0    192.168.10.10    192.168.10.10     10
     192.168.10.0    255.255.255.0    192.168.10.20    192.168.10.20     10
     192.168.10.0    255.255.255.0    192.168.10.30    192.168.10.30     10
    192.168.10.10  255.255.255.255        127.0.0.1        127.0.0.1     10
    192.168.10.20  255.255.255.255        127.0.0.1        127.0.0.1     10
    192.168.10.30  255.255.255.255        127.0.0.1        127.0.0.1     10
   192.168.10.255  255.255.255.255    192.168.10.10    192.168.10.10     10
   192.168.10.255  255.255.255.255    192.168.10.20    192.168.10.20     10
   192.168.10.255  255.255.255.255    192.168.10.30    192.168.10.30     10
        224.0.0.0        240.0.0.0        10.1.1.26        10.1.1.26     20
        224.0.0.0        240.0.0.0    192.168.10.10    192.168.10.10     10
        224.0.0.0        240.0.0.0    192.168.10.20    192.168.10.20     10
        224.0.0.0        240.0.0.0    192.168.10.30    192.168.10.30     10
  255.255.255.255  255.255.255.255        10.1.1.26        10.1.1.26      1
  255.255.255.255  255.255.255.255    192.168.10.10    192.168.10.10      1
  255.255.255.255  255.255.255.255    192.168.10.20    192.168.10.20      1
  255.255.255.255  255.255.255.255    192.168.10.30    192.168.10.30      1
Default Gateway:      192.168.10.1
===========================================================================
Persistent Routes:
  Network Address          Netmask  Gateway Address  Metric
         10.1.2.0    255.255.255.0         10.1.1.1       1
         10.1.4.0    255.255.255.0         10.1.1.1       1

-----------
No this config works...i have no issues access everything from outside.

here is my dilemma.  if i remove the GW from the 4th nic, (i need this on a different sub for later) and assign a manual route as follows -

route add -p 192.168.10.0 mask 255.255.255.0 192.168.10.1

my published access via ISA stops working from externally.  if i start monitoring i see the session open on isa...but nothing goes back from the DMZ.  I cannot hard code the DGW to the 4th NIC.  That nic is going to be used on a separate subnet and will have its own DGW.

I hope someone can shed somoe light on this for me.

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[+][-]10.06.2008 at 01:37PM PDT, ID: 22654189

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About this solution

Zone: MS Forefront-ISA
Tags: Microsoft, ISA Server, 2006
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Solution Provided By: keith_alabaster
Participating Experts: 1
Solution Grade: A
 
 
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